idb wip

38 files changed, 9467 insertions, 0 deletions

diff --git a/packages/idb-bridge/.prettierrc b/packages/idb-bridge/.prettierrc
new file mode 100644
index 000000000..50063da90
--- /dev/null
+++ b/packages/idb-bridge/.prettierrc
@@ -0,0 +1,6 @@
+{
+  "trailingComma": "all",
+  "tabWidth": 2,
+  "semi": true,
+  "singleQuote": false
+}
\ No newline at end of file
diff --git a/packages/idb-bridge/README.md b/packages/idb-bridge/README.md
new file mode 100644
index 000000000..9298f2925
--- /dev/null
+++ b/packages/idb-bridge/README.md
@@ -0,0 +1,18 @@
+# idb-bridge
+
+The `idb-bridge` package implements the IndexedDB API with multiple backends.
+
+Currently available backends are:
+ * sqlite: A SQLite3 database.  Can be backed by a file or in memory.
+ * memdb: An unoptimized in-memory storage backend.  Useful for environments
+   that do not have sqlite.
+
+## Known Issues
+
+IndexedDB assumes that after a database has been opened, the set of object stores and indices does not change,
+even when there is no transaction active.  We cannot guarantee this with SQLite.
+
+## Acknowledgements
+
+This library is based on the fakeIndexedDB library
+(https://github.com/dumbmatter/fakeIndexedDB).
\ No newline at end of file
diff --git a/packages/idb-bridge/package.json b/packages/idb-bridge/package.json
new file mode 100644
index 000000000..4279bb3a9
--- /dev/null
+++ b/packages/idb-bridge/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "idb-bridge",
+  "version": "0.0.1",
+  "description": "IndexedDB implementation that uses SQLite3 as storage",
+  "main": "index.js",
+  "author": "Florian Dold",
+  "license": "AGPL-3.0-or-later",
+  "private": false,
+  "dependencies": {
+    "sqlite3": "^4.0.8"
+  },
+  "scripts": {
+    "test": "tsc && ava"
+  },
+  "devDependencies": {
+    "ava": "^1.4.1",
+    "typescript": "^3.4.5"
+  }
+}
diff --git a/packages/idb-bridge/src/BridgeIDBCursor.ts b/packages/idb-bridge/src/BridgeIDBCursor.ts
new file mode 100644
index 000000000..0120bb7d5
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBCursor.ts
@@ -0,0 +1,315 @@
+/*
+ Copyright 2019 Florian Dold
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import BridgeIDBKeyRange from "./BridgeIDBKeyRange";
+import BridgeIDBObjectStore from "./BridgeIDBObjectStore";
+import BridgeIDBRequest from "./BridgeIDBRequest";
+import cmp from "./util/cmp";
+import {
+  DataError,
+  InvalidAccessError,
+  InvalidStateError,
+  ReadOnlyError,
+  TransactionInactiveError,
+} from "./util/errors";
+import extractKey from "./util/extractKey";
+import structuredClone from "./util/structuredClone";
+import {
+  CursorRange,
+  CursorSource,
+  Key,
+  Value,
+  BridgeIDBCursorDirection,
+} from "./util/types";
+import valueToKey from "./util/valueToKey";
+import {
+  RecordGetRequest,
+  ResultLevel,
+  Backend,
+  DatabaseTransaction,
+  RecordStoreRequest,
+} from "./backend-interface";
+
+/**
+ * http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#cursor
+ */
+class BridgeIDBCursor {
+  _request: BridgeIDBRequest | undefined;
+
+  private _gotValue: boolean = false;
+  private _range: CursorRange;
+  private _position = undefined; // Key of previously returned record
+  private _objectStorePosition = undefined;
+  private _keyOnly: boolean = false;
+
+  private _source: CursorSource;
+  private _direction: BridgeIDBCursorDirection;
+  private _key = undefined;
+  private _primaryKey: Key | undefined = undefined;
+  private _indexName: string | undefined;
+  private _objectStoreName: string;
+
+  constructor(
+    source: CursorSource,
+    objectStoreName: string,
+    indexName: string | undefined,
+    range: CursorRange,
+    direction: BridgeIDBCursorDirection,
+    request: BridgeIDBRequest,
+    keyOnly: boolean,
+  ) {
+    this._indexName = indexName;
+    this._objectStoreName = objectStoreName;
+    this._range = range;
+    this._source = source;
+    this._direction = direction;
+    this._request = request;
+    this._keyOnly = keyOnly;
+  }
+
+  get _effectiveObjectStore(): BridgeIDBObjectStore {
+    if (this.source instanceof BridgeIDBObjectStore) {
+      return this.source;
+    }
+    return this.source.objectStore;
+  }
+
+  get _backend(): Backend {
+    return this._source._backend;
+  }
+
+  // Read only properties
+  get source() {
+    return this._source;
+  }
+  set source(val) {
+    /* For babel */
+  }
+
+  get direction() {
+    return this._direction;
+  }
+  set direction(val) {
+    /* For babel */
+  }
+
+  get key() {
+    return this._key;
+  }
+  set key(val) {
+    /* For babel */
+  }
+
+  get primaryKey() {
+    return this._primaryKey;
+  }
+  set primaryKey(val) {
+    /* For babel */
+  }
+
+  /**
+   * https://w3c.github.io/IndexedDB/#iterate-a-cursor
+   */
+  async _iterate(key?: Key, primaryKey?: Key): Promise<any> {
+    const recordGetRequest: RecordGetRequest = {
+      direction: this.direction,
+      indexName: this._indexName,
+      lastIndexPosition: this._position,
+      lastObjectStorePosition: this._objectStorePosition,
+      limit: 1,
+      range: this._range,
+      objectStoreName: this._objectStoreName,
+      advanceIndexKey: key,
+      advancePrimaryKey: primaryKey,
+      resultLevel: this._keyOnly ? ResultLevel.OnlyKeys : ResultLevel.Full,
+    };
+
+    const { btx } = this.source._confirmActiveTransaction();
+
+    let response = await this._backend.getRecords(
+      btx,
+      recordGetRequest,
+    );
+
+    if (response.count === 0) {
+      return null;
+    }
+
+    return this;
+  }
+
+  // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBCursor-update-IDBRequest-any-value
+  public update(value: Value) {
+    if (value === undefined) {
+      throw new TypeError();
+    }
+
+    const transaction = this._effectiveObjectStore.transaction;
+
+    if (transaction._state !== "active") {
+      throw new TransactionInactiveError();
+    }
+
+    if (transaction.mode === "readonly") {
+      throw new ReadOnlyError();
+    }
+
+    if (this._effectiveObjectStore._deleted) {
+      throw new InvalidStateError();
+    }
+    if (
+      !(this.source instanceof BridgeIDBObjectStore) &&
+      this.source._deleted
+    ) {
+      throw new InvalidStateError();
+    }
+
+    if (!this._gotValue || !this.hasOwnProperty("value")) {
+      throw new InvalidStateError();
+    }
+
+    const storeReq: RecordStoreRequest = {
+      overwrite: true,
+      key: this._primaryKey,
+      value: value,
+      objectStoreName: this._objectStoreName,
+    };
+
+    const operation = async () => {
+      const { btx } = this.source._confirmActiveTransaction();
+      this._backend.storeRecord(btx, storeReq);
+    };
+    return transaction._execRequestAsync({
+      operation,
+      source: this,
+    });
+  }
+
+  /**
+   * http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBCursor-advance-void-unsigned-long-count
+   */
+  public advance(count: number) {
+    throw Error("not implemented");
+  }
+
+  /**
+   * http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBCursor-continue-void-any-key
+   */
+  public continue(key?: Key) {
+    const transaction = this._effectiveObjectStore.transaction;
+
+    if (transaction._state !== "active") {
+      throw new TransactionInactiveError();
+    }
+
+    if (this._effectiveObjectStore._deleted) {
+      throw new InvalidStateError();
+    }
+    if (
+      !(this.source instanceof BridgeIDBObjectStore) &&
+      this.source._deleted
+    ) {
+      throw new InvalidStateError();
+    }
+
+    if (!this._gotValue) {
+      throw new InvalidStateError();
+    }
+
+    if (key !== undefined) {
+      key = valueToKey(key);
+
+      const cmpResult = cmp(key, this._position);
+
+      if (
+        (cmpResult <= 0 &&
+          (this.direction === "next" || this.direction === "nextunique")) ||
+        (cmpResult >= 0 &&
+          (this.direction === "prev" || this.direction === "prevunique"))
+      ) {
+        throw new DataError();
+      }
+    }
+
+    if (this._request) {
+      this._request.readyState = "pending";
+    }
+
+    const operation = async () => {
+      this._iterate(key);
+    };
+
+    transaction._execRequestAsync({
+      operation,
+      request: this._request,
+      source: this.source,
+    });
+
+    this._gotValue = false;
+  }
+
+  // https://w3c.github.io/IndexedDB/#dom-idbcursor-continueprimarykey
+  public continuePrimaryKey(key: Key, primaryKey: Key) {
+    throw Error("not implemented");
+  }
+
+  public delete() {
+    const transaction = this._effectiveObjectStore.transaction;
+
+    if (transaction._state !== "active") {
+      throw new TransactionInactiveError();
+    }
+
+    if (transaction.mode === "readonly") {
+      throw new ReadOnlyError();
+    }
+
+    if (this._effectiveObjectStore._deleted) {
+      throw new InvalidStateError();
+    }
+    if (
+      !(this.source instanceof BridgeIDBObjectStore) &&
+      this.source._deleted
+    ) {
+      throw new InvalidStateError();
+    }
+
+    if (!this._gotValue || !this.hasOwnProperty("value")) {
+      throw new InvalidStateError();
+    }
+
+    const operation = async () => {
+      const { btx } = this.source._confirmActiveTransaction();
+      this._backend.deleteRecord(
+        btx,
+        this._objectStoreName,
+        BridgeIDBKeyRange._valueToKeyRange(this._primaryKey),
+      );
+    };
+
+    return transaction._execRequestAsync({
+      operation,
+      source: this,
+    });
+  }
+
+  public toString() {
+    return "[object IDBCursor]";
+  }
+}
+
+export default BridgeIDBCursor;
diff --git a/packages/idb-bridge/src/BridgeIDBCursorWithValue.ts b/packages/idb-bridge/src/BridgeIDBCursorWithValue.ts
new file mode 100644
index 000000000..2739a6f14
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBCursorWithValue.ts
@@ -0,0 +1,44 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import BridgeIDBCursor from "./BridgeIDBCursor";
+import {
+    CursorRange,
+    CursorSource,
+    BridgeIDBCursorDirection,
+    Value,
+} from "./util/types";
+
+class FDBCursorWithValue extends BridgeIDBCursor {
+    public value: Value = undefined;
+
+    constructor(
+        source: CursorSource,
+        objectStoreName: string,
+        indexName: string | undefined,
+        range: CursorRange,
+        direction: BridgeIDBCursorDirection,
+        request?: any,
+    ) {
+        super(source, objectStoreName, indexName, range, direction, request, true);
+    }
+
+    public toString() {
+        return "[object IDBCursorWithValue]";
+    }
+}
+
+export default FDBCursorWithValue;
diff --git a/packages/idb-bridge/src/BridgeIDBDatabase.ts b/packages/idb-bridge/src/BridgeIDBDatabase.ts
new file mode 100644
index 000000000..cff2fd6e3
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBDatabase.ts
@@ -0,0 +1,239 @@
+/*
+ * Copyright 2017 Jeremy Scheff
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+import BridgeIDBTransaction from "./BridgeIDBTransaction";
+import {
+  ConstraintError,
+  InvalidAccessError,
+  InvalidStateError,
+  NotFoundError,
+  TransactionInactiveError,
+} from "./util/errors";
+import fakeDOMStringList from "./util/fakeDOMStringList";
+import FakeEventTarget from "./util/FakeEventTarget";
+import { FakeDOMStringList, KeyPath, TransactionMode } from "./util/types";
+import validateKeyPath from "./util/validateKeyPath";
+import queueTask from "./util/queueTask";
+import {
+  Backend,
+  DatabaseConnection,
+  Schema,
+  DatabaseTransaction,
+} from "./backend-interface";
+
+/**
+ * Ensure that an active version change transaction is currently running.
+ */
+const confirmActiveVersionchangeTransaction = (database: BridgeIDBDatabase) => {
+  if (!database._runningVersionchangeTransaction) {
+    throw new InvalidStateError();
+  }
+
+  // Find the latest versionchange transaction
+  const transactions = database._transactions.filter(
+    (tx: BridgeIDBTransaction) => {
+      return tx.mode === "versionchange";
+    },
+  );
+  const transaction = transactions[transactions.length - 1];
+
+  if (!transaction || transaction._state === "finished") {
+    throw new InvalidStateError();
+  }
+
+  if (transaction._state !== "active") {
+    throw new TransactionInactiveError();
+  }
+
+  return transaction;
+};
+
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#database-interface
+class BridgeIDBDatabase extends FakeEventTarget {
+  _closePending = false;
+  _closed = false;
+  _runningVersionchangeTransaction = false;
+  _transactions: Array<BridgeIDBTransaction> = [];
+
+  _backendConnection: DatabaseConnection;
+  _backend: Backend;
+
+  _schema: Schema;
+
+  get name(): string {
+    return this._schema.databaseName;
+  }
+
+  get version(): number {
+    return this._schema.databaseVersion;
+  }
+
+  get objectStoreNames(): FakeDOMStringList {
+    return fakeDOMStringList(Object.keys(this._schema.objectStores)).sort();
+  }
+
+  /**
+   * http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#database-closing-steps
+   */
+  _closeConnection() {
+    this._closePending = true;
+
+    const transactionsComplete = this._transactions.every(
+      (transaction: BridgeIDBTransaction) => {
+        return transaction._state === "finished";
+      },
+    );
+
+    if (transactionsComplete) {
+      this._closed = true;
+      this._backend.close(this._backendConnection);
+    } else {
+      queueTask(() => {
+        this._closeConnection();
+      });
+    }
+  }
+
+  constructor(backend: Backend, backendConnection: DatabaseConnection) {
+    super();
+
+    this._schema = backend.getSchema(backendConnection);
+
+    this._backend = backend;
+    this._backendConnection = backendConnection;
+  }
+
+  // http://w3c.github.io/IndexedDB/#dom-idbdatabase-createobjectstore
+  public createObjectStore(
+    name: string,
+    options: { autoIncrement?: boolean; keyPath?: KeyPath } | null = {},
+  ) {
+    if (name === undefined) {
+      throw new TypeError();
+    }
+    const transaction = confirmActiveVersionchangeTransaction(this);
+    const backendTx = transaction._backendTransaction;
+    if (!backendTx) {
+      throw Error("invariant violated");
+    }
+
+    const keyPath =
+      options !== null && options.keyPath !== undefined
+        ? options.keyPath
+        : null;
+    const autoIncrement =
+      options !== null && options.autoIncrement !== undefined
+        ? options.autoIncrement
+        : false;
+
+    if (keyPath !== null) {
+      validateKeyPath(keyPath);
+    }
+
+    if (!Object.keys(this._schema.objectStores).includes(name)) {
+      throw new ConstraintError();
+    }
+
+    if (autoIncrement && (keyPath === "" || Array.isArray(keyPath))) {
+      throw new InvalidAccessError();
+    }
+
+    transaction._backend.createObjectStore(backendTx, name, keyPath, autoIncrement);
+
+    this._schema = this._backend.getSchema(this._backendConnection);
+
+    return transaction.objectStore("name");
+  }
+
+  public deleteObjectStore(name: string): void {
+    if (name === undefined) {
+      throw new TypeError();
+    }
+    const transaction = confirmActiveVersionchangeTransaction(this);
+    transaction._objectStoresCache.delete(name);
+  }
+
+  public _internalTransaction(
+    storeNames: string | string[],
+    mode?: TransactionMode,
+    backendTransaction?: DatabaseTransaction,
+  ): BridgeIDBTransaction {
+    mode = mode !== undefined ? mode : "readonly";
+    if (
+      mode !== "readonly" &&
+      mode !== "readwrite" &&
+      mode !== "versionchange"
+    ) {
+      throw new TypeError("Invalid mode: " + mode);
+    }
+
+    const hasActiveVersionchange = this._transactions.some(
+      (transaction: BridgeIDBTransaction) => {
+        return (
+          transaction._state === "active" &&
+          transaction.mode === "versionchange" &&
+          transaction.db === this
+        );
+      },
+    );
+    if (hasActiveVersionchange) {
+      throw new InvalidStateError();
+    }
+
+    if (this._closePending) {
+      throw new InvalidStateError();
+    }
+
+    if (!Array.isArray(storeNames)) {
+      storeNames = [storeNames];
+    }
+    if (storeNames.length === 0 && mode !== "versionchange") {
+      throw new InvalidAccessError();
+    }
+    for (const storeName of storeNames) {
+      if (this.objectStoreNames.indexOf(storeName) < 0) {
+        throw new NotFoundError(
+          "No objectStore named " + storeName + " in this database",
+        );
+      }
+    }
+
+    const tx = new BridgeIDBTransaction(storeNames, mode, this, backendTransaction);
+    this._transactions.push(tx);
+    return tx;
+  }
+
+  public transaction(
+    storeNames: string | string[],
+    mode?: TransactionMode,
+  ): BridgeIDBTransaction {
+    if (mode === "versionchange") {
+      throw new TypeError("Invalid mode: " + mode);
+    }
+    return this._internalTransaction(storeNames, mode);
+  }
+
+  public close() {
+    this._closeConnection();
+  }
+
+  public toString() {
+    return "[object IDBDatabase]";
+  }
+}
+
+export default BridgeIDBDatabase;
diff --git a/packages/idb-bridge/src/BridgeIDBFactory.ts b/packages/idb-bridge/src/BridgeIDBFactory.ts
new file mode 100644
index 000000000..c2747238e
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBFactory.ts
@@ -0,0 +1,192 @@
+/*
+ * Copyright 2019 Florian Dold
+ * Copyright 2017 Jeremy Scheff
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+import BridgeIDBDatabase from "./BridgeIDBDatabase";
+import BridgeIDBOpenDBRequest from "./BridgeIDBOpenDBRequest";
+import BridgeIDBVersionChangeEvent from "./BridgeIDBVersionChangeEvent";
+import compareKeys from "./util/cmp";
+import enforceRange from "./util/enforceRange";
+import { AbortError, VersionError } from "./util/errors";
+import FakeEvent from "./util/FakeEvent";
+import { Backend, DatabaseConnection } from "./backend-interface";
+import queueTask from "./util/queueTask";
+
+type DatabaseList = Array<{ name: string; version: number }>;
+
+class BridgeIDBFactory {
+  public cmp = compareKeys;
+  private backend: Backend;
+  private connections: BridgeIDBDatabase[] = [];
+
+  public constructor(backend: Backend) {
+    this.backend = backend;
+  }
+
+  // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBFactory-deleteDatabase-IDBOpenDBRequest-DOMString-name
+  public deleteDatabase(name: string): BridgeIDBOpenDBRequest {
+    const request = new BridgeIDBOpenDBRequest();
+    request.source = null;
+
+    queueTask(async () => {
+      const databases = await this.backend.getDatabases();
+      const dbInfo = databases.find((x) => x.name == name);
+      if (!dbInfo) {
+        // Database already doesn't exist, success!
+        const event = new BridgeIDBVersionChangeEvent("success", {
+          newVersion: null,
+          oldVersion: 0,
+        });
+        request.dispatchEvent(event);
+        return;
+      }
+      const oldVersion = dbInfo.version;
+
+      try {
+        const dbconn = await this.backend.connectDatabase(name);
+        const backendTransaction = await this.backend.enterVersionChange(dbconn, 0);
+        await this.backend.deleteDatabase(backendTransaction, name);
+        await this.backend.commit(backendTransaction);
+        await this.backend.close(dbconn);
+
+        request.result = undefined;
+        request.readyState = "done";
+
+        const event2 = new BridgeIDBVersionChangeEvent("success", {
+          newVersion: null,
+          oldVersion,
+        });
+        request.dispatchEvent(event2);
+      } catch (err) {
+        request.error = new Error();
+        request.error.name = err.name;
+        request.readyState = "done";
+
+        const event = new FakeEvent("error", {
+          bubbles: true,
+          cancelable: true,
+        });
+        event.eventPath = [];
+        request.dispatchEvent(event);
+      }
+    });
+
+    return request;
+  }
+
+  // tslint:disable-next-line max-line-length
+  // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBFactory-open-IDBOpenDBRequest-DOMString-name-unsigned-long-long-version
+  public open(name: string, version?: number) {
+    if (arguments.length > 1 && version !== undefined) {
+      // Based on spec, not sure why "MAX_SAFE_INTEGER" instead of "unsigned long long", but it's needed to pass
+      // tests
+      version = enforceRange(version, "MAX_SAFE_INTEGER");
+    }
+    if (version === 0) {
+      throw new TypeError();
+    }
+
+    const request = new BridgeIDBOpenDBRequest();
+
+    queueTask(async () => {
+      let dbconn: DatabaseConnection;
+      try {
+        dbconn = await this.backend.connectDatabase(name);
+      } catch (err) {
+        request._finishWithError(err);
+        return;
+      }
+
+      const schema = this.backend.getSchema(dbconn);
+      const existingVersion = schema.databaseVersion;
+
+      if (version === undefined) {
+        version = existingVersion !== 0 ? existingVersion : 1;
+      }
+
+      const requestedVersion = version;
+
+      if (existingVersion > requestedVersion) {
+        request._finishWithError(new VersionError());
+        return;
+      }
+
+      const db = new BridgeIDBDatabase(this.backend, dbconn);
+
+      if (existingVersion < requestedVersion) {
+        // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-steps-for-running-a-versionchange-transaction
+
+        for (const otherConn of this.connections) {
+          const event = new BridgeIDBVersionChangeEvent("versionchange", {
+            newVersion: version,
+            oldVersion: existingVersion,
+          });
+          otherConn.dispatchEvent(event);
+        }
+
+        if (this._anyOpen()) {
+          const event = new BridgeIDBVersionChangeEvent("blocked", {
+            newVersion: version,
+            oldVersion: existingVersion,
+          });
+          request.dispatchEvent(event);
+        }
+
+        const backendTransaction = await this.backend.enterVersionChange(dbconn, requestedVersion);
+        db._runningVersionchangeTransaction = true;
+
+        const transaction = db._internalTransaction(
+          [],
+          "versionchange",
+          backendTransaction,
+        );
+        const event = new BridgeIDBVersionChangeEvent("upgradeneeded", {
+          newVersion: version,
+          oldVersion: existingVersion,
+        });
+
+        request.result = db;
+        request.readyState = "done";
+        request.transaction = transaction;
+        request.dispatchEvent(event);
+
+        await transaction._waitDone();
+
+        db._runningVersionchangeTransaction = false;
+      }
+
+      this.connections.push(db);
+      return db;
+    });
+
+    return request;
+  }
+
+  // https://w3c.github.io/IndexedDB/#dom-idbfactory-databases
+  public databases(): Promise<DatabaseList> {
+    return this.backend.getDatabases();
+  }
+
+  public toString(): string {
+    return "[object IDBFactory]";
+  }
+
+  private _anyOpen(): boolean {
+    return this.connections.some(c => !c._closed && !c._closePending);
+  }
+}
+
+export default BridgeIDBFactory;
diff --git a/packages/idb-bridge/src/BridgeIDBIndex.ts b/packages/idb-bridge/src/BridgeIDBIndex.ts
new file mode 100644
index 000000000..6001bc051
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBIndex.ts
@@ -0,0 +1,316 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import BridgeIDBCursor from "./BridgeIDBCursor";
+import BridgeIDBCursorWithValue from "./BridgeIDBCursorWithValue";
+import BridgeIDBKeyRange from "./BridgeIDBKeyRange";
+import BridgeIDBObjectStore from "./BridgeIDBObjectStore";
+import BridgeIDBRequest from "./BridgeIDBRequest";
+import enforceRange from "./util/enforceRange";
+import {
+  ConstraintError,
+  InvalidStateError,
+  TransactionInactiveError,
+} from "./util/errors";
+import { BridgeIDBCursorDirection, Key, KeyPath } from "./util/types";
+import valueToKey from "./util/valueToKey";
+import BridgeIDBTransaction from "./BridgeIDBTransaction";
+import {
+  Schema,
+  Backend,
+  DatabaseTransaction,
+  RecordGetRequest,
+  ResultLevel,
+} from "./backend-interface";
+
+const confirmActiveTransaction = (
+  index: BridgeIDBIndex,
+): BridgeIDBTransaction => {
+  if (index._deleted || index.objectStore._deleted) {
+    throw new InvalidStateError();
+  }
+
+  if (index.objectStore.transaction._state !== "active") {
+    throw new TransactionInactiveError();
+  }
+
+  return index.objectStore.transaction;
+};
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#idl-def-IDBIndex
+class BridgeIDBIndex {
+  objectStore: BridgeIDBObjectStore;
+
+  get _schema(): Schema {
+    return this.objectStore.transaction.db._schema;
+  }
+
+  get keyPath(): KeyPath {
+    return this._schema.indexes[this._name].keyPath;
+  }
+
+  get multiEntry(): boolean {
+    return this._schema.indexes[this._name].multiEntry;
+  }
+
+  get unique(): boolean {
+    return this._schema.indexes[this._name].unique;
+  }
+
+  get _backend(): Backend {
+    return this.objectStore._backend;
+  }
+
+  _confirmActiveTransaction(): { btx: DatabaseTransaction } {
+    return this.objectStore._confirmActiveTransaction();
+  }
+
+  private _name: string;
+
+  public _deleted: boolean = false;
+
+  constructor(objectStore: BridgeIDBObjectStore, name: string) {
+    this._name = name;
+    this.objectStore = objectStore;
+  }
+
+  get name() {
+    return this._name;
+  }
+
+  // https://w3c.github.io/IndexedDB/#dom-idbindex-name
+  set name(name: any) {
+    const transaction = this.objectStore.transaction;
+
+    if (!transaction.db._runningVersionchangeTransaction) {
+      throw new InvalidStateError();
+    }
+
+    if (transaction._state !== "active") {
+      throw new TransactionInactiveError();
+    }
+
+    const { btx } = this._confirmActiveTransaction();
+
+    const oldName = this._name;
+    const newName = String(name);
+
+    if (newName === oldName) {
+      return;
+    }
+
+    this._backend.renameIndex(btx, oldName, newName);
+
+    if (this.objectStore.indexNames.indexOf(name) >= 0) {
+      throw new ConstraintError();
+    }
+  }
+
+  // tslint:disable-next-line max-line-length
+  // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBIndex-openCursor-IDBRequest-any-range-IDBCursorDirection-direction
+  public openCursor(
+    range?: BridgeIDBKeyRange | Key | null | undefined,
+    direction: BridgeIDBCursorDirection = "next",
+  ) {
+    confirmActiveTransaction(this);
+
+    if (range === null) {
+      range = undefined;
+    }
+    if (range !== undefined && !(range instanceof BridgeIDBKeyRange)) {
+      range = BridgeIDBKeyRange.only(valueToKey(range));
+    }
+
+    const request = new BridgeIDBRequest();
+    request.source = this;
+    request.transaction = this.objectStore.transaction;
+
+    const cursor = new BridgeIDBCursorWithValue(
+      this,
+      this.objectStore.name,
+      this._name,
+      range,
+      direction,
+      request,
+    );
+
+    const operation = async () => {
+      return cursor._iterate();
+    };
+
+    return this.objectStore.transaction._execRequestAsync({
+      operation,
+      request,
+      source: this,
+    });
+  }
+
+  // tslint:disable-next-line max-line-length
+  // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBIndex-openKeyCursor-IDBRequest-any-range-IDBCursorDirection-direction
+  public openKeyCursor(
+    range?: BridgeIDBKeyRange | Key | null | undefined,
+    direction: BridgeIDBCursorDirection = "next",
+  ) {
+    confirmActiveTransaction(this);
+
+    if (range === null) {
+      range = undefined;
+    }
+    if (range !== undefined && !(range instanceof BridgeIDBKeyRange)) {
+      range = BridgeIDBKeyRange.only(valueToKey(range));
+    }
+
+    const request = new BridgeIDBRequest();
+    request.source = this;
+    request.transaction = this.objectStore.transaction;
+
+    const cursor = new BridgeIDBCursor(
+      this,
+      this.objectStore.name,
+      this._name,
+      range,
+      direction,
+      request,
+      true,
+    );
+
+    return this.objectStore.transaction._execRequestAsync({
+      operation: cursor._iterate.bind(cursor),
+      request,
+      source: this,
+    });
+  }
+
+  public get(key: BridgeIDBKeyRange | Key) {
+    confirmActiveTransaction(this);
+
+    if (!(key instanceof BridgeIDBKeyRange)) {
+      key = BridgeIDBKeyRange._valueToKeyRange(key);
+    }
+
+    const getReq: RecordGetRequest = {
+      direction: "next",
+      indexName: this._name,
+      limit: 1,
+      range: key,
+      objectStoreName: this.objectStore._name,
+      resultLevel: ResultLevel.Full,
+    };
+
+    const operation = async () => {
+      const { btx } = this._confirmActiveTransaction();
+      const result = await this._backend.getRecords(btx, getReq);
+      if (result.count == 0) {
+        return undefined;
+      }
+      const values = result.values;
+      if (!values) {
+        throw Error("invariant violated");
+      }
+      return values[0];
+    };
+
+    return this.objectStore.transaction._execRequestAsync({
+      operation,
+      source: this,
+    });
+  }
+
+  // http://w3c.github.io/IndexedDB/#dom-idbindex-getall
+  public getAll(query?: BridgeIDBKeyRange | Key, count?: number) {
+    throw Error("not implemented");
+  }
+
+  // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBIndex-getKey-IDBRequest-any-key
+  public getKey(key: BridgeIDBKeyRange | Key) {
+    confirmActiveTransaction(this);
+
+    if (!(key instanceof BridgeIDBKeyRange)) {
+      key = BridgeIDBKeyRange._valueToKeyRange(key);
+    }
+
+    const getReq: RecordGetRequest = {
+      direction: "next",
+      indexName: this._name,
+      limit: 1,
+      range: key,
+      objectStoreName: this.objectStore._name,
+      resultLevel: ResultLevel.OnlyKeys,
+    };
+
+    const operation = async () => {
+      const { btx } = this._confirmActiveTransaction();
+      const result = await this._backend.getRecords(btx, getReq);
+      if (result.count == 0) {
+        return undefined;
+      }
+      const primaryKeys = result.primaryKeys;
+      if (!primaryKeys) {
+        throw Error("invariant violated");
+      }
+      return primaryKeys[0];
+    };
+
+    return this.objectStore.transaction._execRequestAsync({
+      operation,
+      source: this,
+    });
+  }
+
+  // http://w3c.github.io/IndexedDB/#dom-idbindex-getallkeys
+  public getAllKeys(query?: BridgeIDBKeyRange | Key, count?: number) {
+    throw Error("not implemented");
+  }
+
+  // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBIndex-count-IDBRequest-any-key
+  public count(key: BridgeIDBKeyRange | Key | null | undefined) {
+    confirmActiveTransaction(this);
+
+    if (key === null) {
+      key = undefined;
+    }
+    if (key !== undefined && !(key instanceof BridgeIDBKeyRange)) {
+      key = BridgeIDBKeyRange.only(valueToKey(key));
+    }
+
+    const getReq: RecordGetRequest = {
+      direction: "next",
+      indexName: this._name,
+      limit: 1,
+      range: key,
+      objectStoreName: this.objectStore._name,
+      resultLevel: ResultLevel.OnlyCount,
+    };
+
+    const operation = async () => {
+      const { btx } = this._confirmActiveTransaction();
+      const result = await this._backend.getRecords(btx, getReq);
+      return result.count;
+    };
+
+    return this.objectStore.transaction._execRequestAsync({
+      operation,
+      source: this,
+    });
+
+  }
+
+  public toString() {
+    return "[object IDBIndex]";
+  }
+}
+
+export default BridgeIDBIndex;
diff --git a/packages/idb-bridge/src/BridgeIDBKeyRange.ts b/packages/idb-bridge/src/BridgeIDBKeyRange.ts
new file mode 100644
index 000000000..2b32c7e0a
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBKeyRange.ts
@@ -0,0 +1,133 @@
+/*
+  Copyright 2019 Florian Dold
+  Copyright 2017 Jeremy Scheff
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+  or implied. See the License for the specific language governing
+  permissions and limitations under the License.
+ */
+
+import compareKeys from "./util/cmp";
+import { DataError } from "./util/errors";
+import { Key } from "./util/types";
+import valueToKey from "./util/valueToKey";
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#range-concept
+class BridgeIDBKeyRange {
+  public static only(value: Key) {
+    if (arguments.length === 0) {
+      throw new TypeError();
+    }
+    value = valueToKey(value);
+    return new BridgeIDBKeyRange(value, value, false, false);
+  }
+
+  static lowerBound(lower: Key, open: boolean = false) {
+    if (arguments.length === 0) {
+      throw new TypeError();
+    }
+    lower = valueToKey(lower);
+    return new BridgeIDBKeyRange(lower, undefined, open, true);
+  }
+
+  static upperBound(upper: Key, open: boolean = false) {
+    if (arguments.length === 0) {
+      throw new TypeError();
+    }
+    upper = valueToKey(upper);
+    return new BridgeIDBKeyRange(undefined, upper, true, open);
+  }
+
+  static bound(
+    lower: Key,
+    upper: Key,
+    lowerOpen: boolean = false,
+    upperOpen: boolean = false,
+  ) {
+    if (arguments.length < 2) {
+      throw new TypeError();
+    }
+
+    const cmpResult = compareKeys(lower, upper);
+    if (cmpResult === 1 || (cmpResult === 0 && (lowerOpen || upperOpen))) {
+      throw new DataError();
+    }
+
+    lower = valueToKey(lower);
+    upper = valueToKey(upper);
+    return new BridgeIDBKeyRange(lower, upper, lowerOpen, upperOpen);
+  }
+
+  readonly lower: Key | undefined;
+  readonly upper: Key | undefined;
+  readonly lowerOpen: boolean;
+  readonly upperOpen: boolean;
+
+  constructor(
+    lower: Key | undefined,
+    upper: Key | undefined,
+    lowerOpen: boolean,
+    upperOpen: boolean,
+  ) {
+    this.lower = lower;
+    this.upper = upper;
+    this.lowerOpen = lowerOpen;
+    this.upperOpen = upperOpen;
+  }
+
+  // https://w3c.github.io/IndexedDB/#dom-idbkeyrange-includes
+  includes(key: Key) {
+    if (arguments.length === 0) {
+      throw new TypeError();
+    }
+    key = valueToKey(key);
+
+    if (this.lower !== undefined) {
+      const cmpResult = compareKeys(this.lower, key);
+
+      if (cmpResult === 1 || (cmpResult === 0 && this.lowerOpen)) {
+        return false;
+      }
+    }
+    if (this.upper !== undefined) {
+      const cmpResult = compareKeys(this.upper, key);
+
+      if (cmpResult === -1 || (cmpResult === 0 && this.upperOpen)) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  toString() {
+    return "[object IDBKeyRange]";
+  }
+
+  static _valueToKeyRange(value: any, nullDisallowedFlag: boolean = false) {
+    if (value instanceof BridgeIDBKeyRange) {
+        return value;
+    }
+
+    if (value === null || value === undefined) {
+        if (nullDisallowedFlag) {
+            throw new DataError();
+        }
+        return new BridgeIDBKeyRange(undefined, undefined, false, false);
+    }
+
+    const key = valueToKey(value);
+
+    return BridgeIDBKeyRange.only(key);
+  }
+
+}
+
+export default BridgeIDBKeyRange;
diff --git a/packages/idb-bridge/src/BridgeIDBObjectStore.ts b/packages/idb-bridge/src/BridgeIDBObjectStore.ts
new file mode 100644
index 000000000..197f06d86
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBObjectStore.ts
@@ -0,0 +1,441 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import BridgeIDBCursor from "./BridgeIDBCursor";
+import BridgeIDBCursorWithValue from "./BridgeIDBCursorWithValue";
+import BridgeIDBIndex from "./BridgeIDBIndex";
+import BridgeIDBKeyRange from "./BridgeIDBKeyRange";
+import BridgeIDBRequest from "./BridgeIDBRequest";
+import BridgeIDBTransaction from "./BridgeIDBTransaction";
+
+import {
+  ConstraintError,
+  DataError,
+  InvalidAccessError,
+  InvalidStateError,
+  NotFoundError,
+  ReadOnlyError,
+  TransactionInactiveError,
+} from "./util/errors";
+import extractKey from "./util/extractKey";
+import fakeDOMStringList from "./util/fakeDOMStringList";
+import structuredClone from "./util/structuredClone";
+import {
+  FakeDOMStringList,
+  BridgeIDBCursorDirection,
+  Key,
+  KeyPath,
+  Value,
+} from "./util/types";
+import validateKeyPath from "./util/validateKeyPath";
+import valueToKey from "./util/valueToKey";
+import {
+  DatabaseTransaction,
+  RecordGetRequest,
+  ResultLevel,
+} from "./backend-interface";
+
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#object-store
+class BridgeIDBObjectStore {
+  _indexesCache: Map<string, BridgeIDBIndex> = new Map();
+
+  transaction: BridgeIDBTransaction;
+
+  get autoIncrement(): boolean {
+    return this._schema.objectStores[this._name].autoIncrement;
+  }
+
+  get indexNames(): FakeDOMStringList {
+    return fakeDOMStringList(this._schema.objectStores[this._name].indexes).sort();
+  }
+
+  get keyPath(): KeyPath | null {
+    return this._schema.objectStores[this._name].keyPath;
+  }
+
+  _name: string;
+
+  get _schema() {
+    return this.transaction.db._schema;
+  }
+
+  _deleted: boolean = false;
+
+  constructor(transaction: BridgeIDBTransaction, name: string) {
+    this._name = name;
+    this.transaction = transaction;
+  }
+
+  get name() {
+    return this._name;
+  }
+
+  get _backend() {
+    return this.transaction.db._backend;
+  }
+
+  get _backendConnection() {
+    return this.transaction.db._backendConnection;
+  }
+
+  _confirmActiveTransaction(): { btx: DatabaseTransaction } {
+    const btx = this.transaction._backendTransaction;
+    if (!btx) {
+      throw new InvalidStateError();
+    }
+    return { btx };
+  }
+
+  // http://w3c.github.io/IndexedDB/#dom-idbobjectstore-name
+  set name(newName: any) {
+    const transaction = this.transaction;
+
+    if (!transaction.db._runningVersionchangeTransaction) {
+      throw new InvalidStateError();
+    }
+
+    let { btx } = this._confirmActiveTransaction();
+
+
+    newName = String(newName);
+
+    const oldName = this._name;
+
+    if (newName === oldName) {
+      return;
+    }
+
+    this._backend.renameObjectStore(btx, oldName, newName);
+    this.transaction.db._schema = this._backend.getSchema(this._backendConnection);
+  }
+
+  public _store(value: Value, key: Key | undefined, overwrite: boolean) {
+    if (this.transaction.mode === "readonly") {
+      throw new ReadOnlyError();
+    }
+    const operation = async () => {
+      const { btx } = this._confirmActiveTransaction();
+      return this._backend.storeRecord(btx, {
+        objectStoreName: this._name,
+        key: key,
+        value: value,
+        overwrite,
+      });
+    };
+
+    return this.transaction._execRequestAsync({ operation, source: this });
+  }
+
+  public put(value: Value, key?: Key) {
+    if (arguments.length === 0) {
+      throw new TypeError();
+    }
+    return this._store(value, key, true);
+  }
+
+  public add(value: Value, key?: Key) {
+    if (arguments.length === 0) {
+      throw new TypeError();
+    }
+    return this._store(value, key, false);
+  }
+
+  public delete(key: Key) {
+    if (arguments.length === 0) {
+      throw new TypeError();
+    }
+
+    if (this.transaction.mode === "readonly") {
+      throw new ReadOnlyError();
+    }
+
+    if (!(key instanceof BridgeIDBKeyRange)) {
+      key = valueToKey(key);
+    }
+
+    const operation = async () => {
+      const { btx } = this._confirmActiveTransaction();
+      return this._backend.deleteRecord(btx, this._name, key);
+    }
+      
+    return this.transaction._execRequestAsync({
+      operation,
+      source: this,
+    });
+  }
+
+  public get(key?: BridgeIDBKeyRange | Key) {
+    if (arguments.length === 0) {
+      throw new TypeError();
+    }
+
+    if (!(key instanceof BridgeIDBKeyRange)) {
+      key = valueToKey(key);
+    }
+
+    const recordRequest: RecordGetRequest = {
+      objectStoreName: this._name,
+      indexName: undefined,
+      lastIndexPosition: undefined,
+      lastObjectStorePosition: undefined,
+      direction: "next",
+      limit: 1,
+      resultLevel: ResultLevel.Full,
+      range: key,
+    };
+
+    const operation = async () => {
+      const { btx } = this._confirmActiveTransaction();
+      const result = await this._backend.getRecords(
+        btx,
+        recordRequest,
+      );
+      if (result.count == 0) {
+        return undefined;
+      }
+      const values = result.values;
+      if (!values) {
+        throw Error("invariant violated");
+      }
+      return values[0];
+    };
+
+    return this.transaction._execRequestAsync({
+      operation,
+      source: this,
+    });
+  }
+
+  // http://w3c.github.io/IndexedDB/#dom-idbobjectstore-getall
+  public getAll(query?: BridgeIDBKeyRange | Key, count?: number) {
+    throw Error("not implemented");
+  }
+
+  // http://w3c.github.io/IndexedDB/#dom-idbobjectstore-getkey
+  public getKey(key?: BridgeIDBKeyRange | Key) {
+    throw Error("not implemented");
+  }
+
+  // http://w3c.github.io/IndexedDB/#dom-idbobjectstore-getallkeys
+  public getAllKeys(query?: BridgeIDBKeyRange | Key, count?: number) {
+    throw Error("not implemented");
+  }
+
+  public clear() {
+    throw Error("not implemented");
+  }
+
+  public openCursor(
+    range?: BridgeIDBKeyRange | Key,
+    direction: BridgeIDBCursorDirection = "next",
+  ) {
+
+    if (range === null) {
+      range = undefined;
+    }
+    if (range !== undefined && !(range instanceof BridgeIDBKeyRange)) {
+      range = BridgeIDBKeyRange.only(valueToKey(range));
+    }
+
+    const request = new BridgeIDBRequest();
+    request.source = this;
+    request.transaction = this.transaction;
+
+    const cursor = new BridgeIDBCursorWithValue(
+      this,
+      this._name,
+      undefined,
+      range,
+      direction,
+      request,
+    );
+
+    return this.transaction._execRequestAsync({
+      operation: () => cursor._iterate(),
+      request,
+      source: this,
+    });
+  }
+
+  public openKeyCursor(
+    range?: BridgeIDBKeyRange | Key,
+    direction?: BridgeIDBCursorDirection,
+  ) {
+    if (range === null) {
+      range = undefined;
+    }
+    if (range !== undefined && !(range instanceof BridgeIDBKeyRange)) {
+      range = BridgeIDBKeyRange.only(valueToKey(range));
+    }
+
+    if (!direction) {
+      direction = "next";
+    }
+
+    const request = new BridgeIDBRequest();
+    request.source = this;
+    request.transaction = this.transaction;
+
+    const cursor = new BridgeIDBCursor(
+      this,
+      this._name,
+      undefined,
+      range,
+      direction,
+      request,
+      true,
+    );
+
+    return this.transaction._execRequestAsync({
+      operation: cursor._iterate.bind(cursor),
+      request,
+      source: this,
+    });
+  }
+
+  // tslint:disable-next-line max-line-length
+  // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBObjectStore-createIndex-IDBIndex-DOMString-name-DOMString-sequence-DOMString--keyPath-IDBIndexParameters-optionalParameters
+  public createIndex(
+    indexName: string,
+    keyPath: KeyPath,
+    optionalParameters: { multiEntry?: boolean; unique?: boolean } = {},
+  ) {
+    if (arguments.length < 2) {
+      throw new TypeError();
+    }
+
+    if (!this.transaction.db._runningVersionchangeTransaction) {
+      throw new InvalidStateError();
+    }
+
+    const { btx } = this._confirmActiveTransaction();
+
+    const multiEntry =
+      optionalParameters.multiEntry !== undefined
+        ? optionalParameters.multiEntry
+        : false;
+    const unique =
+      optionalParameters.unique !== undefined
+        ? optionalParameters.unique
+        : false;
+
+    if (this.transaction.mode !== "versionchange") {
+      throw new InvalidStateError();
+    }
+
+    if (this.indexNames.indexOf(indexName) >= 0) {
+      throw new ConstraintError();
+    }
+
+    validateKeyPath(keyPath);
+
+    if (Array.isArray(keyPath) && multiEntry) {
+      throw new InvalidAccessError();
+    }
+
+    this._backend.createIndex(
+      btx,
+      indexName,
+      this._name,
+      keyPath,
+      multiEntry,
+      unique,
+    );
+
+    return new BridgeIDBIndex(this, indexName);
+  }
+
+  // https://w3c.github.io/IndexedDB/#dom-idbobjectstore-index
+  public index(name: string) {
+    if (arguments.length === 0) {
+      throw new TypeError();
+    }
+
+    if (this.transaction._state === "finished") {
+      throw new InvalidStateError();
+    }
+
+    const index = this._indexesCache.get(name);
+    if (index !== undefined) {
+      return index;
+    }
+
+    return new BridgeIDBIndex(this, name);
+  }
+
+  public deleteIndex(name: string) {
+    if (arguments.length === 0) {
+      throw new TypeError();
+    }
+
+    if (this.transaction.mode !== "versionchange") {
+      throw new InvalidStateError();
+    }
+
+    if (!this.transaction.db._runningVersionchangeTransaction) {
+      throw new InvalidStateError();
+    }
+
+    const { btx } = this._confirmActiveTransaction();
+
+    const index = this._indexesCache.get(name);
+    if (index !== undefined) {
+      index._deleted = true;
+    }
+
+    this._backend.deleteIndex(btx, name);
+  }
+
+  // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBObjectStore-count-IDBRequest-any-key
+  public count(key?: Key | BridgeIDBKeyRange) {
+
+    if (key === null) {
+      key = undefined;
+    }
+    if (key !== undefined && !(key instanceof BridgeIDBKeyRange)) {
+      key = BridgeIDBKeyRange.only(valueToKey(key));
+    }
+
+    const recordGetRequest: RecordGetRequest = {
+      direction: "next",
+      indexName: undefined,
+      lastIndexPosition: undefined,
+      limit: -1,
+      objectStoreName: this._name,
+      lastObjectStorePosition: undefined,
+      range: key,
+      resultLevel: ResultLevel.OnlyCount,
+    };
+
+    const operation = async () => {
+      const { btx } = this._confirmActiveTransaction();
+      const result = await this._backend.getRecords(
+        btx,
+        recordGetRequest,
+      );
+      return result.count;
+    };
+
+    return this.transaction._execRequestAsync({ operation, source: this });
+  }
+
+  public toString() {
+    return "[object IDBObjectStore]";
+  }
+}
+
+export default BridgeIDBObjectStore;
diff --git a/packages/idb-bridge/src/BridgeIDBOpenDBRequest.ts b/packages/idb-bridge/src/BridgeIDBOpenDBRequest.ts
new file mode 100644
index 000000000..7b636193f
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBOpenDBRequest.ts
@@ -0,0 +1,36 @@
+/*
+  Copyright 2019 Florian Dold
+  Copyright 2017 Jeremy Scheff
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+  or implied. See the License for the specific language governing
+  permissions and limitations under the License.
+*/
+
+import BridgeIDBRequest from "./BridgeIDBRequest";
+import { EventCallback } from "./util/types";
+
+class BridgeIDBOpenDBRequest extends BridgeIDBRequest {
+    public onupgradeneeded: EventCallback | null = null;
+    public onblocked: EventCallback | null = null;
+
+    constructor() {
+      super();
+      // https://www.w3.org/TR/IndexedDB/#open-requests
+      this.source = null;
+    }
+
+    public toString() {
+        return "[object IDBOpenDBRequest]";
+    }
+}
+
+export default BridgeIDBOpenDBRequest;
diff --git a/packages/idb-bridge/src/BridgeIDBRequest.ts b/packages/idb-bridge/src/BridgeIDBRequest.ts
new file mode 100644
index 000000000..cd0092859
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBRequest.ts
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2017 Jeremy Scheff
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+import BridgeFDBCursor from "./BridgeIDBCursor";
+import BridgeIDBIndex from "./BridgeIDBIndex";
+import BridgeIDBObjectStore from "./BridgeIDBObjectStore";
+import BridgeIDBTransaction from "./BridgeIDBTransaction";
+import { InvalidStateError } from "./util/errors";
+import FakeEventTarget from "./util/FakeEventTarget";
+import { EventCallback } from "./util/types";
+import FakeEvent from "./util/FakeEvent";
+
+class BridgeIDBRequest extends FakeEventTarget {
+  _result: any = null;
+  _error: Error | null | undefined = null;
+  source: BridgeFDBCursor | BridgeIDBIndex | BridgeIDBObjectStore | null = null;
+  transaction: BridgeIDBTransaction | null = null;
+  readyState: "done" | "pending" = "pending";
+  onsuccess: EventCallback | null = null;
+  onerror: EventCallback | null = null;
+
+  get error() {
+    if (this.readyState === "pending") {
+      throw new InvalidStateError();
+    }
+    return this._error;
+  }
+
+  set error(value: any) {
+    this._error = value;
+  }
+
+  get result() {
+    if (this.readyState === "pending") {
+      throw new InvalidStateError();
+    }
+    return this._result;
+  }
+
+  set result(value: any) {
+    this._result = value;
+  }
+
+  toString() {
+    return "[object IDBRequest]";
+  }
+
+  _finishWithError(err: Error) {
+    this.result = undefined;
+    this.readyState = "done";
+
+    this.error = new Error(err.message);
+    this.error.name = err.name;
+
+    const event = new FakeEvent("error", {
+      bubbles: true,
+      cancelable: true,
+    });
+    event.eventPath = [];
+    this.dispatchEvent(event);
+  }
+
+  _finishWithResult(result: any) {
+    this.result = result;
+    this.readyState = "done";
+
+    const event = new FakeEvent("success");
+    event.eventPath = [];
+    this.dispatchEvent(event);
+  }
+}
+
+export default BridgeIDBRequest;
diff --git a/packages/idb-bridge/src/BridgeIDBTransaction.ts b/packages/idb-bridge/src/BridgeIDBTransaction.ts
new file mode 100644
index 000000000..a7057e297
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBTransaction.ts
@@ -0,0 +1,301 @@
+import BridgeIDBDatabase from "./BridgeIDBDatabase";
+import BridgeIDBObjectStore from "./BridgeIDBObjectStore";
+import BridgeIDBRequest from "./BridgeIDBRequest";
+import {
+  AbortError,
+  InvalidStateError,
+  NotFoundError,
+  TransactionInactiveError,
+} from "./util/errors";
+import fakeDOMStringList from "./util/fakeDOMStringList";
+import FakeEvent from "./util/FakeEvent";
+import FakeEventTarget from "./util/FakeEventTarget";
+import {
+  EventCallback,
+  FakeDOMStringList,
+  RequestObj,
+  TransactionMode,
+} from "./util/types";
+import queueTask from "./util/queueTask";
+import openPromise from "./util/openPromise";
+import { DatabaseTransaction, Backend } from "./backend-interface";
+import { array } from "prop-types";
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#transaction
+class BridgeIDBTransaction extends FakeEventTarget {
+  public _state: "active" | "inactive" | "committing" | "finished" = "active";
+  public _started = false;
+  public _objectStoresCache: Map<string, BridgeIDBObjectStore> = new Map();
+
+  public _backendTransaction?: DatabaseTransaction;
+
+  public objectStoreNames: FakeDOMStringList;
+  public mode: TransactionMode;
+  public db: BridgeIDBDatabase;
+  public error: Error | null = null;
+  public onabort: EventCallback | null = null;
+  public oncomplete: EventCallback | null = null;
+  public onerror: EventCallback | null = null;
+
+  private _waitPromise: Promise<void>;
+  private _resolveWait: () => void;
+
+  public _scope: Set<string>;
+  private _requests: Array<{
+    operation: () => void;
+    request: BridgeIDBRequest;
+  }> = [];
+
+  get _backend(): Backend {
+    return this.db._backend;
+  }
+
+  constructor(
+    storeNames: string[],
+    mode: TransactionMode,
+    db: BridgeIDBDatabase,
+    backendTransaction?: DatabaseTransaction,
+  ) {
+    super();
+
+    const myOpenPromise = openPromise<void>();
+    this._waitPromise = myOpenPromise.promise;
+    this._resolveWait = myOpenPromise.resolve;
+
+    this._scope = new Set(storeNames);
+    this._backendTransaction = backendTransaction;
+    this.mode = mode;
+    this.db = db;
+    this.objectStoreNames = fakeDOMStringList(Array.from(this._scope).sort());
+
+    this.db._transactions.push(this);
+  }
+
+  // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-steps-for-aborting-a-transaction
+  async _abort(errName: string | null) {
+    this._state = "finished";
+
+    if (errName !== null) {
+      const e = new Error();
+      e.name = errName;
+      this.error = e;
+    }
+
+    // Should this directly remove from _requests?
+    for (const { request } of this._requests) {
+      if (request.readyState !== "done") {
+        request.readyState = "done"; // This will cancel execution of this request's operation
+        if (request.source) {
+          request.result = undefined;
+          request.error = new AbortError();
+
+          const event = new FakeEvent("error", {
+            bubbles: true,
+            cancelable: true,
+          });
+          event.eventPath = [this.db, this];
+          request.dispatchEvent(event);
+        }
+      }
+    }
+
+    // Only roll back if we actually executed the scheduled operations.
+    const maybeBtx = this._backendTransaction;
+    if (maybeBtx) {
+      await this._backend.rollback(maybeBtx);
+    }
+
+    queueTask(() => {
+      const event = new FakeEvent("abort", {
+        bubbles: true,
+        cancelable: false,
+      });
+      event.eventPath = [this.db];
+      this.dispatchEvent(event);
+    });
+
+  }
+
+  public abort() {
+    if (this._state === "committing" || this._state === "finished") {
+      throw new InvalidStateError();
+    }
+    this._state = "active";
+
+    this._abort(null);
+  }
+
+  // http://w3c.github.io/IndexedDB/#dom-idbtransaction-objectstore
+  public objectStore(name: string) {
+    if (this._state !== "active") {
+      throw new InvalidStateError();
+    }
+
+    const objectStore = this._objectStoresCache.get(name);
+    if (objectStore !== undefined) {
+      return objectStore;
+    }
+
+    return new BridgeIDBObjectStore(this, name);
+  }
+
+  // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-steps-for-asynchronously-executing-a-request
+  public _execRequestAsync(obj: RequestObj) {
+    const source = obj.source;
+    const operation = obj.operation;
+    let request = obj.hasOwnProperty("request") ? obj.request : null;
+
+    if (this._state !== "active") {
+      throw new TransactionInactiveError();
+    }
+
+    // Request should only be passed for cursors
+    if (!request) {
+      if (!source) {
+        // Special requests like indexes that just need to run some code
+        request = new BridgeIDBRequest();
+      } else {
+        request = new BridgeIDBRequest();
+        request.source = source;
+        request.transaction = (source as any).transaction;
+      }
+    }
+
+    this._requests.push({
+      operation,
+      request,
+    });
+
+    return request;
+  }
+
+  public async _start() {
+    this._started = true;
+
+    if (!this._backendTransaction) {
+      this._backendTransaction = await this._backend.beginTransaction(
+        this.db._backendConnection,
+        Array.from(this._scope),
+        this.mode,
+      );
+    }
+
+    // Remove from request queue - cursor ones will be added back if necessary by cursor.continue and such
+    let operation;
+    let request;
+    while (this._requests.length > 0) {
+      const r = this._requests.shift();
+
+      // This should only be false if transaction was aborted
+      if (r && r.request.readyState !== "done") {
+        request = r.request;
+        operation = r.operation;
+        break;
+      }
+    }
+
+    if (request && operation) {
+      if (!request.source) {
+        // Special requests like indexes that just need to run some code, with error handling already built into
+        // operation
+        await operation();
+      } else {
+        let defaultAction;
+        let event;
+        try {
+          const result = await operation();
+          request.readyState = "done";
+          request.result = result;
+          request.error = undefined;
+
+          // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-fire-a-success-event
+          if (this._state === "inactive") {
+            this._state = "active";
+          }
+          event = new FakeEvent("success", {
+            bubbles: false,
+            cancelable: false,
+          });
+        } catch (err) {
+          request.readyState = "done";
+          request.result = undefined;
+          request.error = err;
+
+          // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-fire-an-error-event
+          if (this._state === "inactive") {
+            this._state = "active";
+          }
+          event = new FakeEvent("error", {
+            bubbles: true,
+            cancelable: true,
+          });
+
+          defaultAction = this._abort.bind(this, err.name);
+        }
+
+        try {
+          event.eventPath = [this.db, this];
+          request.dispatchEvent(event);
+        } catch (err) {
+          if (this._state !== "committing") {
+            this._abort("AbortError");
+          }
+          throw err;
+        }
+
+        // Default action of event
+        if (!event.canceled) {
+          if (defaultAction) {
+            defaultAction();
+          }
+        }
+      }
+
+      // On to the next one
+      if (this._requests.length > 0) {
+        this._start();
+      } else {
+        // Give it another chance for new handlers to be set before finishing
+        queueTask(() => this._start());
+      }
+      return;
+    }
+
+    // Check if transaction complete event needs to be fired
+    if (this._state !== "finished") {
+      // Either aborted or committed already
+      this._state = "finished";
+
+      if (!this.error) {
+        const event = new FakeEvent("complete");
+        this.dispatchEvent(event);
+      }
+
+      const idx = this.db._transactions.indexOf(this);
+      if (idx < 0) {
+        throw Error("invariant failed");
+      }
+      this.db._transactions.splice(idx, 1);
+
+      this._resolveWait();
+    }
+  }
+
+  public commit() {
+    if (this._state !== "active") {
+      throw new InvalidStateError();
+    }
+
+    this._state = "committing";
+  }
+
+  public toString() {
+    return "[object IDBRequest]";
+  }
+
+  _waitDone(): Promise<void> {
+    return this._waitPromise;
+  }
+}
+
+export default BridgeIDBTransaction;
diff --git a/packages/idb-bridge/src/BridgeIDBVersionChangeEvent.ts b/packages/idb-bridge/src/BridgeIDBVersionChangeEvent.ts
new file mode 100644
index 000000000..6fc63ee35
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBVersionChangeEvent.ts
@@ -0,0 +1,41 @@
+/*
+  Copyright 2019 Florian Dold
+  Copyright 2017 Jeremy Scheff
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+  or implied. See the License for the specific language governing
+  permissions and limitations under the License.
+ */
+
+import FakeEvent from "./util/FakeEvent";
+
+class BridgeIDBVersionChangeEvent extends FakeEvent {
+    public newVersion: number | null;
+    public oldVersion: number;
+
+    constructor(
+        type: "blocked" | "success" | "upgradeneeded" | "versionchange",
+        parameters: { newVersion?: number | null; oldVersion?: number } = {},
+    ) {
+        super(type);
+
+        this.newVersion =
+            parameters.newVersion !== undefined ? parameters.newVersion : null;
+        this.oldVersion =
+            parameters.oldVersion !== undefined ? parameters.oldVersion : 0;
+    }
+
+    public toString() {
+        return "[object IDBVersionChangeEvent]";
+    }
+}
+
+export default BridgeIDBVersionChangeEvent;
diff --git a/packages/idb-bridge/src/MemoryBackend.test.ts b/packages/idb-bridge/src/MemoryBackend.test.ts
new file mode 100644
index 000000000..3d2d0fbc9
--- /dev/null
+++ b/packages/idb-bridge/src/MemoryBackend.test.ts
@@ -0,0 +1,31 @@
+import test from 'ava';
+import MemoryBackend from './MemoryBackend';
+import BridgeIDBFactory from './BridgeIDBFactory';
+
+test.cb("basics", (t) => {
+
+  const backend = new MemoryBackend();
+  const idb = new BridgeIDBFactory(backend);
+
+  const request = idb.open("library");
+  request.onupgradeneeded = () => {
+    const db = request.result;
+    const store = db.createObjectStore("books", {keyPath: "isbn"});
+    const titleIndex = store.createIndex("by_title", "title", {unique: true});
+    const authorIndex = store.createIndex("by_author", "author");
+  
+    // Populate with initial data.
+    store.put({title: "Quarry Memories", author: "Fred", isbn: 123456});
+    store.put({title: "Water Buffaloes", author: "Fred", isbn: 234567});
+    store.put({title: "Bedrock Nights", author: "Barney", isbn: 345678});
+  };
+
+  request.onsuccess = () => {
+    t.end();
+  };
+
+  request.onerror = () => {
+    t.fail();
+  };
+
+});
diff --git a/packages/idb-bridge/src/MemoryBackend.ts b/packages/idb-bridge/src/MemoryBackend.ts
new file mode 100644
index 000000000..2d4b8ab93
--- /dev/null
+++ b/packages/idb-bridge/src/MemoryBackend.ts
@@ -0,0 +1,662 @@
+import {
+  Backend,
+  DatabaseConnection,
+  DatabaseTransaction,
+  Schema,
+  RecordStoreRequest,
+  IndexProperties,
+} from "./backend-interface";
+import structuredClone from "./util/structuredClone";
+import { InvalidStateError, InvalidAccessError } from "./util/errors";
+import BTree, { ISortedMap, ISortedMapF } from "./tree/b+tree";
+import BridgeIDBFactory from "./BridgeIDBFactory";
+import compareKeys from "./util/cmp";
+import extractKey from "./util/extractKey";
+import { Key, Value, KeyPath } from "./util/types";
+
+enum TransactionLevel {
+  Disconnected = 0,
+  Connected = 1,
+  Read = 2,
+  Write = 3,
+  VersionChange = 4,
+}
+
+interface ObjectStore {
+  originalName: string;
+  modifiedName: string | undefined;
+  originalData: ISortedMapF;
+  modifiedData: ISortedMapF | undefined;
+  deleted: boolean;
+  originalKeyGenerator: number;
+  modifiedKeyGenerator: number | undefined;
+}
+
+interface Index {
+  originalName: string;
+  modifiedName: string | undefined;
+  originalData: ISortedMapF;
+  modifiedData: ISortedMapF | undefined;
+  deleted: boolean;
+}
+
+interface Database {
+  committedObjectStores: { [name: string]: ObjectStore };
+  modifiedObjectStores: { [name: string]: ObjectStore };
+  committedIndexes: { [name: string]: Index };
+  modifiedIndexes: { [name: string]: Index };
+  committedSchema: Schema;
+  /**
+   * Was the transaction deleted during the running transaction?
+   */
+  deleted: boolean;
+
+  txLevel: TransactionLevel;
+
+  connectionCookie: string | undefined;
+}
+
+interface Connection {
+  dbName: string;
+
+  modifiedSchema: Schema | undefined;
+
+  /**
+   * Has the underlying database been deleted?
+   */
+  deleted: boolean;
+
+  /**
+   * Map from the effective name of an object store during
+   * the transaction to the real name.
+   */
+  objectStoreMap: { [currentName: string]: ObjectStore };
+  indexMap: { [currentName: string]: Index };
+}
+
+class AsyncCondition {
+  wait(): Promise<void> {
+    throw Error("not implemented");
+  }
+
+  trigger(): void {}
+}
+
+
+
+
+function insertIntoIndex(
+  index: Index,
+  value: Value,
+  indexProperties: IndexProperties,
+) {
+  if (indexProperties.multiEntry) {
+
+  } else {
+    const key = extractKey(value, indexProperties.keyPath);
+  }
+  throw Error("not implemented");
+}
+
+/**
+ * Primitive in-memory backend.
+ */
+export class MemoryBackend implements Backend {
+  databases: { [name: string]: Database } = {};
+
+  connectionIdCounter = 1;
+
+  transactionIdCounter = 1;
+
+  /**
+   * Connections by connection cookie.
+   */
+  connections: { [name: string]: Connection } = {};
+
+  /**
+   * Connections by transaction (!!) cookie.  In this implementation,
+   * at most one transaction can run at the same time per connection.
+   */
+  connectionsByTransaction: { [tx: string]: Connection } = {};
+
+  /**
+   * Condition that is triggered whenever a client disconnects.
+   */
+  disconnectCond: AsyncCondition = new AsyncCondition();
+
+  /**
+   * Conditation that is triggered whenever a transaction finishes.
+   */
+  transactionDoneCond: AsyncCondition = new AsyncCondition();
+
+  async getDatabases(): Promise<{ name: string; version: number }[]> {
+    const dbList = [];
+    for (const name in this.databases) {
+      dbList.push({
+        name,
+        version: this.databases[name].committedSchema.databaseVersion,
+      });
+    }
+    return dbList;
+  }
+
+  async deleteDatabase(tx: DatabaseTransaction, name: string): Promise<void> {
+    const myConn = this.connectionsByTransaction[tx.transactionCookie];
+    if (!myConn) {
+      throw Error("no connection associated with transaction");
+    }
+    const myDb = this.databases[name];
+    if (!myDb) {
+      throw Error("db not found");
+    }
+    if (myDb.committedSchema.databaseName !== name) {
+      throw Error("name does not match");
+    }
+    if (myDb.txLevel < TransactionLevel.VersionChange) {
+      throw new InvalidStateError();
+    }
+    if (myDb.connectionCookie !== tx.transactionCookie) {
+      throw new InvalidAccessError();
+    }
+    myDb.deleted = true;
+  }
+
+  async connectDatabase(name: string): Promise<DatabaseConnection> {
+    const connectionId = this.connectionIdCounter++;
+    const connectionCookie = `connection-${connectionId}`;
+
+    let database = this.databases[name];
+    if (!database) {
+      const schema: Schema = {
+        databaseName: name,
+        indexes: {},
+        databaseVersion: 0,
+        objectStores: {},
+      };
+      database = {
+        committedSchema: schema,
+        deleted: false,
+        modifiedIndexes: {},
+        committedIndexes: {},
+        committedObjectStores: {},
+        modifiedObjectStores: {},
+        txLevel: TransactionLevel.Disconnected,
+        connectionCookie: undefined,
+      };
+      this.databases[name] = database;
+    }
+
+    while (database.txLevel !== TransactionLevel.Disconnected) {
+      await this.disconnectCond.wait();
+    }
+
+    database.txLevel = TransactionLevel.Connected;
+    database.connectionCookie = connectionCookie;
+
+    return { connectionCookie };
+  }
+
+  async beginTransaction(
+    conn: DatabaseConnection,
+    objectStores: string[],
+    mode: import("./util/types").TransactionMode,
+  ): Promise<DatabaseTransaction> {
+    const transactionCookie = `tx-${this.transactionIdCounter++}`;
+    const myConn = this.connections[conn.connectionCookie];
+    if (!myConn) {
+      throw Error("connection not found");
+    }
+    const myDb = this.databases[myConn.dbName];
+    if (!myDb) {
+      throw Error("db not found");
+    }
+
+    while (myDb.txLevel !== TransactionLevel.Connected) {
+      await this.transactionDoneCond.wait();
+    }
+
+    if (mode === "readonly") {
+      myDb.txLevel = TransactionLevel.Read;
+    } else if (mode === "readwrite") {
+      myDb.txLevel = TransactionLevel.Write;
+    } else {
+      throw Error("unsupported transaction mode");
+    }
+
+    this.connectionsByTransaction[transactionCookie] = myConn;
+
+    return { transactionCookie };
+  }
+
+  async enterVersionChange(
+    conn: DatabaseConnection,
+    newVersion: number,
+  ): Promise<DatabaseTransaction> {
+    const transactionCookie = `tx-vc-${this.transactionIdCounter++}`;
+    const myConn = this.connections[conn.connectionCookie];
+    if (!myConn) {
+      throw Error("connection not found");
+    }
+    const myDb = this.databases[myConn.dbName];
+    if (!myDb) {
+      throw Error("db not found");
+    }
+
+    while (myDb.txLevel !== TransactionLevel.Connected) {
+      await this.transactionDoneCond.wait();
+    }
+
+    myDb.txLevel = TransactionLevel.VersionChange;
+
+    this.connectionsByTransaction[transactionCookie] = myConn;
+
+    return { transactionCookie };
+  }
+
+  async close(conn: DatabaseConnection): Promise<void> {
+    const myConn = this.connections[conn.connectionCookie];
+    if (!myConn) {
+      throw Error("connection not found - already closed?");
+    }
+    if (!myConn.deleted) {
+      const myDb = this.databases[myConn.dbName];
+      if (myDb.txLevel != TransactionLevel.Connected) {
+        throw Error("invalid state");
+      }
+      myDb.txLevel = TransactionLevel.Disconnected;
+    }
+    delete this.connections[conn.connectionCookie];
+  }
+
+  getSchema(dbConn: DatabaseConnection): Schema {
+    const myConn = this.connections[dbConn.connectionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (myConn.modifiedSchema) {
+      return myConn.modifiedSchema;
+    }
+    return db.committedSchema;
+  }
+
+  renameIndex(
+    btx: DatabaseTransaction,
+    oldName: string,
+    newName: string,
+  ): void {
+    const myConn = this.connections[btx.transactionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (db.txLevel < TransactionLevel.VersionChange) {
+      throw Error("only allowed in versionchange transaction");
+    }
+    let schema = myConn.modifiedSchema;
+    if (!schema) {
+      throw Error();
+    }
+    if (schema.indexes[newName]) {
+      throw new Error("new index name already used");
+    }
+    if (!schema.indexes[oldName]) {
+      throw new Error("new index name already used");
+    }
+    const index: Index = myConn.indexMap[oldName];
+    if (!index) {
+      throw Error("old index missing in connection's index map");
+    }
+    schema.indexes[newName] = schema.indexes[newName];
+    delete schema.indexes[oldName];
+    for (const storeName in schema.objectStores) {
+      const store = schema.objectStores[storeName];
+      store.indexes = store.indexes.map(x => {
+        if (x == oldName) {
+          return newName;
+        } else {
+          return x;
+        }
+      });
+    }
+    myConn.indexMap[newName] = index;
+    delete myConn.indexMap[oldName];
+    index.modifiedName = newName;
+  }
+
+  deleteIndex(btx: DatabaseTransaction, indexName: string): void {
+    const myConn = this.connections[btx.transactionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (db.txLevel < TransactionLevel.VersionChange) {
+      throw Error("only allowed in versionchange transaction");
+    }
+    let schema = myConn.modifiedSchema;
+    if (!schema) {
+      throw Error();
+    }
+    if (!schema.indexes[indexName]) {
+      throw new Error("index does not exist");
+    }
+    const index: Index = myConn.indexMap[indexName];
+    if (!index) {
+      throw Error("old index missing in connection's index map");
+    }
+    index.deleted = true;
+    delete schema.indexes[indexName];
+    delete myConn.indexMap[indexName];
+    for (const storeName in schema.objectStores) {
+      const store = schema.objectStores[storeName];
+      store.indexes = store.indexes.filter(x => {
+        return x !== indexName;
+      });
+    }
+  }
+
+  deleteObjectStore(btx: DatabaseTransaction, name: string): void {
+    const myConn = this.connections[btx.transactionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (db.txLevel < TransactionLevel.VersionChange) {
+      throw Error("only allowed in versionchange transaction");
+    }
+    const schema = myConn.modifiedSchema;
+    if (!schema) {
+      throw Error();
+    }
+    const objectStoreProperties = schema.objectStores[name];
+    if (!objectStoreProperties) {
+      throw Error("object store not found");
+    }
+    const objectStore = myConn.objectStoreMap[name];
+    if (!objectStore) {
+      throw Error("object store not found in map");
+    }
+    const indexNames = objectStoreProperties.indexes;
+    for (const indexName of indexNames) {
+      this.deleteIndex(btx, indexName);
+    }
+
+    objectStore.deleted = true;
+    delete myConn.objectStoreMap[name];
+    delete schema.objectStores[name];
+  }
+
+  renameObjectStore(
+    btx: DatabaseTransaction,
+    oldName: string,
+    newName: string,
+  ): void {
+    const myConn = this.connections[btx.transactionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (db.txLevel < TransactionLevel.VersionChange) {
+      throw Error("only allowed in versionchange transaction");
+    }
+    const schema = myConn.modifiedSchema;
+    if (!schema) {
+      throw Error();
+    }
+    if (!schema.objectStores[oldName]) {
+      throw Error("object store not found");
+    }
+    if (schema.objectStores[newName]) {
+      throw Error("new object store already exists");
+    }
+    const objectStore = myConn.objectStoreMap[oldName];
+    if (!objectStore) {
+      throw Error("object store not found in map");
+    }
+    objectStore.modifiedName = newName;
+    schema.objectStores[newName] = schema.objectStores[oldName];
+    delete schema.objectStores[oldName];
+    delete myConn.objectStoreMap[oldName];
+    myConn.objectStoreMap[newName] = objectStore;
+  }
+
+  createObjectStore(
+    btx: DatabaseTransaction,
+    name: string,
+    keyPath: string | string[] | null,
+    autoIncrement: boolean,
+  ): void {
+    const myConn = this.connections[btx.transactionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (db.txLevel < TransactionLevel.VersionChange) {
+      throw Error("only allowed in versionchange transaction");
+    }
+    const newObjectStore: ObjectStore = {
+      deleted: false,
+      modifiedName: undefined,
+      originalName: name,
+      modifiedData: undefined,
+      originalData: new BTree([], compareKeys),
+      modifiedKeyGenerator: undefined,
+      originalKeyGenerator: 1,
+    };
+    const schema = myConn.modifiedSchema;
+    if (!schema) {
+      throw Error("no schema for versionchange tx");
+    }
+    schema.objectStores[name] = {
+      autoIncrement,
+      keyPath,
+      indexes: [],
+    };
+    myConn.objectStoreMap[name] = newObjectStore;
+    db.modifiedObjectStores[name] = newObjectStore;
+  }
+
+  createIndex(
+    btx: DatabaseTransaction,
+    indexName: string,
+    objectStoreName: string,
+    keyPath: import("./util/types").KeyPath,
+    multiEntry: boolean,
+    unique: boolean,
+  ): void {
+    const myConn = this.connections[btx.transactionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (db.txLevel < TransactionLevel.VersionChange) {
+      throw Error("only allowed in versionchange transaction");
+    }
+    const indexProperties: IndexProperties = {
+      keyPath,
+      multiEntry,
+      unique,
+    };
+    const newIndex: Index = {
+      deleted: false,
+      modifiedData: undefined,
+      modifiedName: undefined,
+      originalData: new BTree([], compareKeys),
+      originalName: indexName,
+    };
+    myConn.indexMap[indexName] = newIndex;
+    db.modifiedIndexes[indexName] = newIndex;
+    const schema = myConn.modifiedSchema;
+    if (!schema) {
+      throw Error("no schema in versionchange tx");
+    }
+    const objectStoreProperties = schema.objectStores[objectStoreName];
+    if (!objectStoreProperties) {
+      throw Error("object store not found");
+    }
+    objectStoreProperties.indexes.push(indexName);
+    schema.indexes[indexName] = indexProperties;
+
+    // FIXME: build index from existing object store!
+  }
+
+  async deleteRecord(
+    btx: DatabaseTransaction,
+    objectStoreName: string,
+    range: import("./BridgeIDBKeyRange").default,
+  ): Promise<void> {
+    const myConn = this.connections[btx.transactionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (db.txLevel < TransactionLevel.Write) {
+      throw Error("only allowed in write transaction");
+    }
+  }
+
+  async getRecords(
+    btx: DatabaseTransaction,
+    req: import("./backend-interface").RecordGetRequest,
+  ): Promise<import("./backend-interface").RecordGetResponse> {
+    const myConn = this.connections[btx.transactionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (db.txLevel < TransactionLevel.Write) {
+      throw Error("only allowed while running a transaction");
+    }
+    throw Error("not implemented");
+  }
+
+  async storeRecord(
+    btx: DatabaseTransaction,
+    storeReq: RecordStoreRequest,
+  ): Promise<void> {
+    const myConn = this.connections[btx.transactionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (db.txLevel < TransactionLevel.Write) {
+      throw Error("only allowed while running a transaction");
+    }
+    const schema = myConn.modifiedSchema
+      ? myConn.modifiedSchema
+      : db.committedSchema;
+
+    const objectStore = myConn.objectStoreMap[storeReq.objectStoreName];
+
+    const storeKeyResult: StoreKeyResult = getStoreKey(
+      storeReq.value,
+      storeReq.key,
+      objectStore.modifiedKeyGenerator || objectStore.originalKeyGenerator,
+      schema.objectStores[storeReq.objectStoreName].autoIncrement,
+      schema.objectStores[storeReq.objectStoreName].keyPath,
+    );
+    let key = storeKeyResult.key;
+    let value = storeKeyResult.value;
+    objectStore.modifiedKeyGenerator = storeKeyResult.updatedKeyGenerator;
+
+    if (!objectStore.modifiedData) {
+      objectStore.modifiedData = objectStore.originalData;
+    }
+    const modifiedData = objectStore.modifiedData;
+    const hasKey = modifiedData.has(key);
+    if (hasKey && !storeReq.overwrite) {
+      throw Error("refusing to overwrite");
+    }
+
+    objectStore.modifiedData = modifiedData.with(key, value, true);
+
+    for (const indexName of schema.objectStores[storeReq.objectStoreName]
+      .indexes) {
+      const index = myConn.indexMap[indexName];
+      if (!index) {
+        throw Error("index referenced by object store does not exist");
+      }
+      const indexProperties = schema.indexes[indexName];
+      insertIntoIndex(index, value, indexProperties);
+    }
+  }
+
+  async rollback(btx: DatabaseTransaction): Promise<void> {
+    const myConn = this.connections[btx.transactionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (db.txLevel < TransactionLevel.Read) {
+      throw Error("only allowed while running a transaction");
+    }
+    db.modifiedIndexes = {};
+    db.modifiedObjectStores = {};
+    db.txLevel = TransactionLevel.Connected;
+    myConn.modifiedSchema = structuredClone(db.committedSchema);
+    myConn.indexMap = Object.assign({}, db.committedIndexes);
+    myConn.objectStoreMap = Object.assign({}, db.committedObjectStores);
+    for (const indexName in db.committedIndexes) {
+      const index = db.committedIndexes[indexName];
+      index.deleted = false;
+      index.modifiedData = undefined;
+      index.modifiedName = undefined;
+    }
+    for (const objectStoreName in db.committedObjectStores) {
+      const objectStore = db.committedObjectStores[objectStoreName];
+      objectStore.deleted = false;
+      objectStore.modifiedData = undefined;
+      objectStore.modifiedName = undefined;
+      objectStore.modifiedKeyGenerator = undefined;
+    }
+  }
+
+  async commit(btx: DatabaseTransaction): Promise<void> {
+    const myConn = this.connections[btx.transactionCookie];
+    if (!myConn) {
+      throw Error("unknown connection");
+    }
+    const db = this.databases[myConn.dbName];
+    if (!db) {
+      throw Error("db not found");
+    }
+    if (db.txLevel < TransactionLevel.Read) {
+      throw Error("only allowed while running a transaction");
+    }
+  }
+}
+
+export default MemoryBackend;
diff --git a/packages/idb-bridge/src/backend-interface.ts b/packages/idb-bridge/src/backend-interface.ts
new file mode 100644
index 000000000..c0f498a10
--- /dev/null
+++ b/packages/idb-bridge/src/backend-interface.ts
@@ -0,0 +1,145 @@
+import {
+  TransactionMode,
+  Value,
+  BridgeIDBCursorDirection,
+  Key,
+  KeyPath,
+  BridgeIDBDatabaseInfo,
+} from "./util/types";
+import BridgeIDBKeyRange from "./BridgeIDBKeyRange";
+
+export interface ObjectStoreProperties {
+  keyPath: KeyPath | null;
+  autoIncrement: boolean;
+  indexes: string[];
+}
+
+export interface IndexProperties {
+  keyPath: KeyPath;
+  multiEntry: boolean;
+  unique: boolean;
+}
+
+export interface Schema {
+  databaseName: string;
+  databaseVersion: number;
+  objectStores: { [name: string]: ObjectStoreProperties };
+  indexes: { [name: string]: IndexProperties };
+}
+
+export interface DatabaseConnection {
+  connectionCookie: string;
+}
+
+export interface DatabaseTransaction {
+  transactionCookie: string;
+}
+
+export enum ResultLevel {
+  Full,
+  OnlyKeys,
+  OnlyCount,
+}
+
+export interface RecordGetRequest {
+  direction: BridgeIDBCursorDirection;
+  objectStoreName: string;
+  indexName: string | undefined;
+  range: BridgeIDBKeyRange | undefined;
+  lastIndexPosition?: Key;
+  lastObjectStorePosition?: Key;
+  advanceIndexKey?: Key;
+  advancePrimaryKey?: Key;
+  limit: number;
+  resultLevel: ResultLevel;
+}
+
+export interface RecordGetResponse {
+  values: Value[] | undefined;
+  keys: Key[] | undefined;
+  primaryKeys: Key[] | undefined;
+  count: number;
+}
+
+export interface RecordStoreRequest {
+  objectStoreName: string;
+  value: Value;
+  key: Key | undefined;
+  overwrite: boolean;
+}
+
+export interface Backend {
+  getDatabases(): Promise<BridgeIDBDatabaseInfo[]>;
+
+  connectDatabase(name: string): Promise<DatabaseConnection>;
+
+  beginTransaction(
+    conn: DatabaseConnection,
+    objectStores: string[],
+    mode: TransactionMode,
+  ): Promise<DatabaseTransaction>;
+
+  enterVersionChange(
+    conn: DatabaseConnection,
+    newVersion: number,
+  ): Promise<DatabaseTransaction>;
+
+  /**
+   * Even though the standard interface for indexedDB doesn't require
+   * the client to run deleteDatabase in a version transaction, there is
+   * implicitly one running. 
+   */
+  deleteDatabase(btx: DatabaseTransaction, name: string): Promise<void>;
+
+  close(db: DatabaseConnection): Promise<void>;
+
+  getSchema(db: DatabaseConnection): Schema;
+
+  renameIndex(btx: DatabaseTransaction, oldName: string, newName: string): void;
+
+  deleteIndex(btx: DatabaseTransaction, indexName: string): void;
+
+  rollback(btx: DatabaseTransaction): Promise<void>;
+
+  commit(btx: DatabaseTransaction): Promise<void>;
+
+  deleteObjectStore(btx: DatabaseTransaction, name: string): void;
+
+  createObjectStore(
+    btx: DatabaseTransaction,
+    name: string,
+    keyPath: string | string[] | null,
+    autoIncrement: boolean,
+  ): void;
+
+  renameObjectStore(
+    btx: DatabaseTransaction,
+    oldName: string,
+    newName: string,
+  ): void;
+
+  createIndex(
+    btx: DatabaseTransaction,
+    indexName: string,
+    objectStoreName: string,
+    keyPath: KeyPath,
+    multiEntry: boolean,
+    unique: boolean,
+  ): void;
+
+  deleteRecord(
+    btx: DatabaseTransaction,
+    objectStoreName: string,
+    range: BridgeIDBKeyRange,
+  ): Promise<void>;
+
+  getRecords(
+    btx: DatabaseTransaction,
+    req: RecordGetRequest,
+  ): Promise<RecordGetResponse>;
+
+  storeRecord(
+    btx: DatabaseTransaction,
+    storeReq: RecordStoreRequest,
+  ): Promise<void>;
+}
diff --git a/packages/idb-bridge/src/tree/b+tree.ts b/packages/idb-bridge/src/tree/b+tree.ts
new file mode 100644
index 000000000..01187cdc2
--- /dev/null
+++ b/packages/idb-bridge/src/tree/b+tree.ts
@@ -0,0 +1,1351 @@
+/*
+Copyright (c) 2018 David Piepgrass
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+SPDX-License-Identifier: MIT
+*/
+
+// Original repository: https://github.com/qwertie/btree-typescript
+
+
+import { ISortedMap, ISortedMapF } from './interfaces';
+export {
+  ISetSource, ISetSink, ISet, ISetF, ISortedSetSource, ISortedSet, ISortedSetF,
+  IMapSource, IMapSink, IMap, IMapF, ISortedMapSource, ISortedMap, ISortedMapF
+} from './interfaces';
+
+export type EditRangeResult<V,R=number> = {value?:V, break?:R, delete?:boolean};
+
+type index = number;
+
+// Informative microbenchmarks & stuff:
+// http://www.jayconrod.com/posts/52/a-tour-of-v8-object-representation (very educational)
+// https://blog.mozilla.org/luke/2012/10/02/optimizing-javascript-variable-access/ (local vars are faster than properties)
+// http://benediktmeurer.de/2017/12/13/an-introduction-to-speculative-optimization-in-v8/ (other stuff)
+// https://jsperf.com/js-in-operator-vs-alternatives (avoid 'in' operator; `.p!==undefined` faster than `hasOwnProperty('p')` in all browsers)
+// https://jsperf.com/instanceof-vs-typeof-vs-constructor-vs-member (speed of type tests varies wildly across browsers)
+// https://jsperf.com/detecting-arrays-new (a.constructor===Array is best across browsers, assuming a is an object)
+// https://jsperf.com/shallow-cloning-methods (a constructor is faster than Object.create; hand-written clone faster than Object.assign)
+// https://jsperf.com/ways-to-fill-an-array (slice-and-replace is fastest)
+// https://jsperf.com/math-min-max-vs-ternary-vs-if (Math.min/max is slow on Edge)
+// https://jsperf.com/array-vs-property-access-speed (v.x/v.y is faster than a[0]/a[1] in major browsers IF hidden class is constant)
+// https://jsperf.com/detect-not-null-or-undefined (`x==null` slightly slower than `x===null||x===undefined` on all browsers)
+// Overall, microbenchmarks suggest Firefox is the fastest browser for JavaScript and Edge is the slowest.
+// Lessons from https://v8project.blogspot.com/2017/09/elements-kinds-in-v8.html:
+//   - Avoid holes in arrays. Avoid `new Array(N)`, it will be "holey" permanently.
+//   - Don't read outside bounds of an array (it scans prototype chain).
+//   - Small integer arrays are stored differently from doubles
+//   - Adding non-numbers to an array deoptimizes it permanently into a general array
+//   - Objects can be used like arrays (e.g. have length property) but are slower
+//   - V8 source (NewElementsCapacity in src/objects.h): arrays grow by 50% + 16 elements
+
+/** Compares two numbers, strings, arrays of numbers/strings, Dates,
+ *  or objects that have a valueOf() method returning a number or string. 
+ *  Optimized for numbers. Returns 1 if a>b, -1 if a<b, and 0 if a===b.
+ */
+export function defaultComparator(a: any, b: any) {
+  var c = a - b;
+  if (c === c) return c; // a & b are number
+  // General case (c is NaN): string / arrays / Date / incomparable things
+  if (a) a = a.valueOf();
+  if (b) b = b.valueOf();
+  return a < b ? -1 : a > b ? 1 : a == b ? 0 : c;   
+};
+
+/**
+ * A reasonably fast collection of key-value pairs with a powerful API. 
+ * Largely compatible with the standard Map. BTree is a B+ tree data structure,
+ * so the collection is sorted by key.
+ * 
+ * B+ trees tend to use memory more efficiently than hashtables such as the
+ * standard Map, especially when the collection contains a large number of 
+ * items. However, maintaining the sort order makes them modestly slower: 
+ * O(log size) rather than O(1). This B+ tree implementation supports O(1)
+ * fast cloning. It also supports freeze(), which can be used to ensure that
+ * a BTree is not changed accidentally.
+ * 
+ * Confusingly, the ES6 Map.forEach(c) method calls c(value,key) instead of
+ * c(key,value), in contrast to other methods such as set() and entries()
+ * which put the key first. I can only assume that the order was reversed on 
+ * the theory that users would usually want to examine values and ignore keys.
+ * BTree's forEach() therefore works the same way, but a second method 
+ * `.forEachPair((key,value)=>{...})` is provided which sends you the key
+ * first and the value second; this method is slightly faster because it is 
+ * the "native" for-each method for this class.
+ * 
+ * Out of the box, BTree supports keys that are numbers, strings, arrays of 
+ * numbers/strings, Date, and objects that have a valueOf() method returning a 
+ * number or string. Other data types, such as arrays of Date or custom
+ * objects, require a custom comparator, which you must pass as the second 
+ * argument to the constructor (the first argument is an optional list of 
+ * initial items). Symbols cannot be used as keys because they are unordered
+ * (one Symbol is never "greater" or "less" than another).
+ * 
+ * @example
+ * Given a {name: string, age: number} object, you can create a tree sorted by
+ * name and then by age like this:
+ *   
+ *     var tree = new BTree(undefined, (a, b) => {
+ *       if (a.name > b.name)
+ *         return 1; // Return a number >0 when a > b
+ *       else if (a.name < b.name)
+ *         return -1; // Return a number <0 when a < b
+ *       else // names are equal (or incomparable)
+ *         return a.age - b.age; // Return >0 when a.age > b.age
+ *     });
+ * 
+ *     tree.set({name:"Bill", age:17}, "happy");
+ *     tree.set({name:"Fran", age:40}, "busy & stressed");
+ *     tree.set({name:"Bill", age:55}, "recently laid off");
+ *     tree.forEachPair((k, v) => {
+ *       console.log(`Name: ${k.name} Age: ${k.age} Status: ${v}`);
+ *     });
+ * 
+ * @description
+ * The "range" methods (`forEach, forRange, editRange`) will return the number
+ * of elements that were scanned. In addition, the callback can return {break:R}
+ * to stop early and return R from the outer function.
+ * 
+ * - TODO: Test performance of preallocating values array at max size
+ * - TODO: Add fast initialization when a sorted array is provided to constructor
+ * 
+ * For more documentation see https://github.com/qwertie/btree-typescript
+ *
+ * Are you a C# developer? You might like the similar data structures I made for C#: 
+ * BDictionary, BList, etc. See http://core.loyc.net/collections/
+ * 
+ * @author David Piepgrass
+ */
+export default class BTree<K=any, V=any> implements ISortedMapF<K,V>, ISortedMap<K,V>
+{
+  private _root: BNode<K, V> = EmptyLeaf as BNode<K,V>;
+  _size: number = 0;
+  _maxNodeSize: number;
+  _compare: (a:K, b:K) => number;
+  
+  /**
+   * Initializes an empty B+ tree.
+   * @param compare Custom function to compare pairs of elements in the tree.
+   *   This is not required for numbers, strings and arrays of numbers/strings.
+   * @param entries A set of key-value pairs to initialize the tree
+   * @param maxNodeSize Branching factor (maximum items or children per node)
+   *   Must be in range 4..256. If undefined or <4 then default is used; if >256 then 256.
+   */
+  public constructor(entries?: [K,V][], compare?: (a: K, b: K) => number, maxNodeSize?: number) {
+    this._maxNodeSize = maxNodeSize! >= 4 ? Math.min(maxNodeSize!, 256) : 32;
+    this._compare = compare || defaultComparator;
+    if (entries)
+      this.setPairs(entries);
+  }
+  
+  // ES6 Map<K,V> methods ///////////////////////////////////////////////////
+
+  /** Gets the number of key-value pairs in the tree. */
+  get size() { return this._size; }
+  /** Gets the number of key-value pairs in the tree. */
+  get length() { return this._size; }
+  /** Returns true iff the tree contains no key-value pairs. */
+  get isEmpty() { return this._size === 0; }
+
+  /** Releases the tree so that its size is 0. */
+  clear() {
+    this._root = EmptyLeaf as BNode<K,V>;
+    this._size = 0;
+  }
+
+  forEach(callback: (v:V, k:K, tree:BTree<K,V>) => void, thisArg?: any): number;
+
+  /** Runs a function for each key-value pair, in order from smallest to 
+   *  largest key. For compatibility with ES6 Map, the argument order to
+   *  the callback is backwards: value first, then key. Call forEachPair 
+   *  instead to receive the key as the first argument.
+   * @param thisArg If provided, this parameter is assigned as the `this`
+   *        value for each callback.
+   * @returns the number of values that were sent to the callback,
+   *        or the R value if the callback returned {break:R}. */
+  forEach<R=number>(callback: (v:V, k:K, tree:BTree<K,V>) => {break?:R}|void, thisArg?: any): R|number {
+    if (thisArg !== undefined)
+      callback = callback.bind(thisArg);
+    return this.forEachPair((k, v) => callback(v, k, this));
+  }
+
+  /** Runs a function for each key-value pair, in order from smallest to 
+   *  largest key. The callback can return {break:R} (where R is any value
+   *  except undefined) to stop immediately and return R from forEachPair.
+   * @param onFound A function that is called for each key-value pair. This 
+   *        function can return {break:R} to stop early with result R.
+   *        The reason that you must return {break:R} instead of simply R 
+   *        itself is for consistency with editRange(), which allows 
+   *        multiple actions, not just breaking.
+   * @param initialCounter This is the value of the third argument of 
+   *        `onFound` the first time it is called. The counter increases 
+   *        by one each time `onFound` is called. Default value: 0
+   * @returns the number of pairs sent to the callback (plus initialCounter,
+   *        if you provided one). If the callback returned {break:R} then
+   *        the R value is returned instead. */
+  forEachPair<R=number>(callback: (k:K, v:V, counter:number) => {break?:R}|void, initialCounter?: number): R|number {
+    var low = this.minKey(), high = this.maxKey();
+    return this.forRange(low!, high!, true, callback, initialCounter);
+  }
+
+  /**
+   * Finds a pair in the tree and returns the associated value.
+   * @param defaultValue a value to return if the key was not found.
+   * @returns the value, or defaultValue if the key was not found.
+   * @description Computational complexity: O(log size)
+   */
+  get(key: K, defaultValue?: V): V | undefined {
+    return this._root.get(key, defaultValue, this);
+  }
+  
+  /**
+   * Adds or overwrites a key-value pair in the B+ tree.
+   * @param key the key is used to determine the sort order of
+   *        data in the tree.
+   * @param value data to associate with the key (optional)
+   * @param overwrite Whether to overwrite an existing key-value pair 
+   *        (default: true). If this is false and there is an existing
+   *        key-value pair then this method has no effect.
+   * @returns true if a new key-value pair was added.
+   * @description Computational complexity: O(log size)
+   * Note: when overwriting a previous entry, the key is updated
+   * as well as the value. This has no effect unless the new key
+   * has data that does not affect its sort order.
+   */
+  set(key: K, value: V, overwrite?: boolean): boolean { 
+    if (this._root.isShared)
+      this._root = this._root.clone();
+    var result = this._root.set(key, value, overwrite, this);
+    if (result === true || result === false)
+      return result;
+    // Root node has split, so create a new root node.
+    this._root = new BNodeInternal<K,V>([this._root, result]);
+    return true;
+  }
+
+  /**
+   * Returns true if the key exists in the B+ tree, false if not.
+   * Use get() for best performance; use has() if you need to
+   * distinguish between "undefined value" and "key not present".
+   * @param key Key to detect
+   * @description Computational complexity: O(log size)
+   */
+  has(key: K): boolean { 
+    return this.forRange(key, key, true, undefined) !== 0;
+  }
+
+  /**
+   * Removes a single key-value pair from the B+ tree.
+   * @param key Key to find
+   * @returns true if a pair was found and removed, false otherwise.
+   * @description Computational complexity: O(log size)
+   */
+  delete(key: K): boolean {
+    return this.editRange(key, key, true, DeleteRange) !== 0;
+  }
+
+  // Clone-mutators /////////////////////////////////////////////////////////
+
+  /** Returns a copy of the tree with the specified key set (the value is undefined). */
+  with(key: K): BTree<K,V|undefined>;
+  /** Returns a copy of the tree with the specified key-value pair set. */
+  with<V2>(key: K, value: V2, overwrite?: boolean): BTree<K,V|V2>;
+  with<V2>(key: K, value?: V2, overwrite?: boolean): BTree<K,V|V2|undefined> {
+    let nu = this.clone() as BTree<K,V|V2|undefined>;
+    return nu.set(key, value, overwrite) || overwrite ? nu : this;
+  }
+
+  /** Returns a copy of the tree with the specified key-value pairs set. */
+  withPairs<V2>(pairs: [K,V|V2][], overwrite: boolean): BTree<K,V|V2> {
+    let nu = this.clone() as BTree<K,V|V2>;
+    return nu.setPairs(pairs, overwrite) !== 0 || overwrite ? nu : this;
+  }
+
+  /** Returns a copy of the tree with the specified keys present. 
+   *  @param keys The keys to add. If a key is already present in the tree,
+   *         neither the existing key nor the existing value is modified.
+   *  @param returnThisIfUnchanged if true, returns this if all keys already 
+   *  existed. Performance note: due to the architecture of this class, all
+   *  node(s) leading to existing keys are cloned even if the collection is
+   *  ultimately unchanged.
+  */
+  withKeys(keys: K[], returnThisIfUnchanged?: boolean): BTree<K,V|undefined> {
+    let nu = this.clone() as BTree<K,V|undefined>, changed = false;
+    for (var i = 0; i < keys.length; i++)
+      changed = nu.set(keys[i], undefined, false) || changed;
+    return returnThisIfUnchanged && !changed ? this : nu;
+  }
+
+  /** Returns a copy of the tree with the specified key removed. 
+   * @param returnThisIfUnchanged if true, returns this if the key didn't exist.
+   *  Performance note: due to the architecture of this class, node(s) leading
+   *  to where the key would have been stored are cloned even when the key
+   *  turns out not to exist and the collection is unchanged.
+   */
+  without(key: K, returnThisIfUnchanged?: boolean): BTree<K,V> {
+    return this.withoutRange(key, key, true, returnThisIfUnchanged);
+  }
+
+  /** Returns a copy of the tree with the specified keys removed.
+   * @param returnThisIfUnchanged if true, returns this if none of the keys
+   *  existed. Performance note: due to the architecture of this class,
+   *  node(s) leading to where the key would have been stored are cloned
+   *  even when the key turns out not to exist.
+   */
+  withoutKeys(keys: K[], returnThisIfUnchanged?: boolean): BTree<K,V> {
+    let nu = this.clone();
+    return nu.deleteKeys(keys) || !returnThisIfUnchanged ? nu : this;
+  }
+
+  /** Returns a copy of the tree with the specified range of keys removed. */
+  withoutRange(low: K, high: K, includeHigh: boolean, returnThisIfUnchanged?: boolean): BTree<K,V> {
+    let nu = this.clone();
+    if (nu.deleteRange(low, high, includeHigh) === 0 && returnThisIfUnchanged)
+      return this;
+    return nu;
+  }
+
+  /** Returns a copy of the tree with pairs removed whenever the callback 
+   *  function returns false. `where()` is a synonym for this method. */
+  filter(callback: (k:K,v:V,counter:number) => boolean, returnThisIfUnchanged?: boolean): BTree<K,V> {
+    var nu = this.greedyClone();
+    var del: any;
+    nu.editAll((k,v,i) => {
+      if (!callback(k, v, i)) return del = Delete;
+    });
+    if (!del && returnThisIfUnchanged)
+      return this;
+    return nu;
+  }
+
+  /** Returns a copy of the tree with all values altered by a callback function. */
+  mapValues<R>(callback: (v:V,k:K,counter:number) => R): BTree<K,R> {
+    var tmp = {} as {value:R};
+    var nu = this.greedyClone();
+    nu.editAll((k,v,i) => {
+      return tmp.value = callback(v, k, i), tmp as any;
+    });
+    return nu as any as BTree<K,R>;
+  }
+
+  /** Performs a reduce operation like the `reduce` method of `Array`. 
+   *  It is used to combine all pairs into a single value, or perform 
+   *  conversions. `reduce` is best understood by example. For example,
+   *  `tree.reduce((P, pair) => P * pair[0], 1)` multiplies all keys 
+   *  together. It means "start with P=1, and for each pair multiply 
+   *  it by the key in pair[0]". Another example would be converting 
+   *  the tree to a Map (in this example, note that M.set returns M):
+   *  
+   *  var M = tree.reduce((M, pair) => M.set(pair[0],pair[1]), new Map())
+   *  
+   *  **Note**: the same array is sent to the callback on every iteration.
+   */
+  reduce<R>(callback: (previous:R,currentPair:[K,V],counter:number,tree:BTree<K,V>) => R, initialValue: R): R;
+  reduce<R>(callback: (previous:R|undefined,currentPair:[K,V],counter:number,tree:BTree<K,V>) => R): R|undefined;
+  reduce<R>(callback: (previous:R|undefined,currentPair:[K,V],counter:number,tree:BTree<K,V>) => R, initialValue?: R): R|undefined {
+    let i = 0, p = initialValue;
+    var it = this.entries(this.minKey(), ReusedArray), next;
+    while (!(next = it.next()).done)
+      p = callback(p, next.value, i++, this);
+    return p;
+  }
+
+  // Iterator methods ///////////////////////////////////////////////////////
+
+  /** Returns an iterator that provides items in order (ascending order if
+   *  the collection's comparator uses ascending order, as is the default.)
+   *  @param lowestKey First key to be iterated, or undefined to start at
+   *         minKey(). If the specified key doesn't exist then iteration
+   *         starts at the next higher key (according to the comparator).
+   *  @param reusedArray Optional array used repeatedly to store key-value
+   *         pairs, to avoid creating a new array on every iteration.
+   */
+  entries(lowestKey?: K, reusedArray?: (K|V)[]): IterableIterator<[K,V]> {
+    var info = this.findPath(lowestKey);
+    if (info === undefined) return iterator<[K,V]>();
+    var {nodequeue, nodeindex, leaf} = info;
+    var state = reusedArray !== undefined ? 1 : 0;
+    var i = (lowestKey === undefined ? -1 : leaf.indexOf(lowestKey, 0, this._compare) - 1);
+
+    return iterator<[K,V]>(() => {
+      jump: for (;;) {
+        switch(state) {
+          case 0:
+            if (++i < leaf.keys.length)
+              return {done: false, value: [leaf.keys[i], leaf.values[i]]};
+            state = 2;
+            continue;
+          case 1:
+            if (++i < leaf.keys.length) {
+              reusedArray![0] = leaf.keys[i], reusedArray![1] = leaf.values[i];
+              return {done: false, value: reusedArray as [K,V]};
+            }
+            state = 2;
+          case 2:
+            // Advance to the next leaf node
+            for (var level = -1;;) {
+              if (++level >= nodequeue.length) {
+                state = 3; continue jump;
+              }
+              if (++nodeindex[level] < nodequeue[level].length)
+                break;
+            }
+            for (; level > 0; level--) {
+              nodequeue[level-1] = (nodequeue[level][nodeindex[level]] as BNodeInternal<K,V>).children;
+              nodeindex[level-1] = 0;
+            }
+            leaf = nodequeue[0][nodeindex[0]];
+            i = -1;
+            state = reusedArray !== undefined ? 1 : 0;
+            continue;
+          case 3:
+            return {done: true, value: undefined};
+        }
+      }
+    });
+  }
+
+  /** Returns an iterator that provides items in reversed order.
+   *  @param highestKey Key at which to start iterating, or undefined to 
+   *         start at minKey(). If the specified key doesn't exist then iteration
+   *         starts at the next lower key (according to the comparator).
+   *  @param reusedArray Optional array used repeatedly to store key-value
+   *         pairs, to avoid creating a new array on every iteration.
+   *  @param skipHighest Iff this flag is true and the highestKey exists in the
+   *         collection, the pair matching highestKey is skipped, not iterated.
+   */
+  entriesReversed(highestKey?: K, reusedArray?: (K|V)[], skipHighest?: boolean): IterableIterator<[K,V]> {
+    if ((highestKey = highestKey || this.maxKey()) === undefined)
+      return iterator<[K,V]>(); // collection is empty
+    var {nodequeue,nodeindex,leaf} = this.findPath(highestKey) || this.findPath(this.maxKey())!;
+    check(!nodequeue[0] || leaf === nodequeue[0][nodeindex[0]], "wat!");
+    var i = leaf.indexOf(highestKey, 0, this._compare);
+    if (!(skipHighest || this._compare(leaf.keys[i], highestKey) > 0))
+      i++;
+    var state = reusedArray !== undefined ? 1 : 0;
+
+    return iterator<[K,V]>(() => {
+      jump: for (;;) {
+        switch(state) {
+          case 0:
+            if (--i >= 0)
+              return {done: false, value: [leaf.keys[i], leaf.values[i]]};
+            state = 2;
+            continue;
+          case 1:
+            if (--i >= 0) {
+              reusedArray![0] = leaf.keys[i], reusedArray![1] = leaf.values[i];
+              return {done: false, value: reusedArray as [K,V]};
+            }
+            state = 2;
+          case 2:
+            // Advance to the next leaf node
+            for (var level = -1;;) {
+              if (++level >= nodequeue.length) {
+                state = 3; continue jump;
+              }
+              if (--nodeindex[level] >= 0)
+                break;
+            }
+            for (; level > 0; level--) {
+              nodequeue[level-1] = (nodequeue[level][nodeindex[level]] as BNodeInternal<K,V>).children;
+              nodeindex[level-1] = nodequeue[level-1].length-1;
+            }
+            leaf = nodequeue[0][nodeindex[0]];
+            i = leaf.keys.length;
+            state = reusedArray !== undefined ? 1 : 0;
+            continue;
+          case 3:
+            return {done: true, value: undefined};
+        }
+      }
+    });
+  }
+
+  /* Used by entries() and entriesReversed() to prepare to start iterating.
+   * It develops a "node queue" for each non-leaf level of the tree.
+   * Levels are numbered "bottom-up" so that level 0 is a list of leaf 
+   * nodes from a low-level non-leaf node. The queue at a given level L
+   * consists of nodequeue[L] which is the children of a BNodeInternal, 
+   * and nodeindex[L], the current index within that child list, such
+   * such that nodequeue[L-1] === nodequeue[L][nodeindex[L]].children.
+   * (However inside this function the order is reversed.)
+   */
+  private findPath(key?: K): { nodequeue: BNode<K,V>[][], nodeindex: number[], leaf: BNode<K,V> } | undefined
+  {
+    var nextnode = this._root;
+    var nodequeue: BNode<K,V>[][], nodeindex: number[];
+
+    if (nextnode.isLeaf) {
+      nodequeue = EmptyArray, nodeindex = EmptyArray; // avoid allocations
+    } else {
+      nodequeue = [], nodeindex = [];
+      for (var d = 0; !nextnode.isLeaf; d++) {
+        nodequeue[d] = (nextnode as BNodeInternal<K,V>).children;
+        nodeindex[d] = key === undefined ? 0 : nextnode.indexOf(key, 0, this._compare);
+        if (nodeindex[d] >= nodequeue[d].length)
+          return; // first key > maxKey()
+        nextnode = nodequeue[d][nodeindex[d]];
+      }
+      nodequeue.reverse();
+      nodeindex.reverse();
+    }
+    return {nodequeue, nodeindex, leaf:nextnode};
+  }
+
+  /** Returns a new iterator for iterating the keys of each pair in ascending order. 
+   *  @param firstKey: Minimum key to include in the output. */
+  keys(firstKey?: K): IterableIterator<K> {
+    var it = this.entries(firstKey, ReusedArray);
+    return iterator<K>(() => {
+      var n: IteratorResult<any> = it.next();
+      if (n.value) n.value = n.value[0];
+      return n;
+    });
+  }
+  
+  /** Returns a new iterator for iterating the values of each pair in order by key. 
+   *  @param firstKey: Minimum key whose associated value is included in the output. */
+  values(firstKey?: K): IterableIterator<V> {
+    var it = this.entries(firstKey, ReusedArray);
+    return iterator<V>(() => {
+      var n: IteratorResult<any> = it.next();
+      if (n.value) n.value = n.value[1];
+      return n;
+    });
+  }
+
+  // Additional methods /////////////////////////////////////////////////////
+
+  /** Returns the maximum number of children/values before nodes will split. */
+  get maxNodeSize() {
+    return this._maxNodeSize;
+  }
+
+  /** Gets the lowest key in the tree. Complexity: O(log size) */
+  minKey(): K | undefined { return this._root.minKey(); }
+  
+  /** Gets the highest key in the tree. Complexity: O(1) */
+  maxKey(): K | undefined { return this._root.maxKey(); }
+
+  /** Quickly clones the tree by marking the root node as shared. 
+   *  Both copies remain editable. When you modify either copy, any
+   *  nodes that are shared (or potentially shared) between the two
+   *  copies are cloned so that the changes do not affect other copies.
+   *  This is known as copy-on-write behavior, or "lazy copying". */
+  clone(): BTree<K,V> {
+    this._root.isShared = true;
+    var result = new BTree<K,V>(undefined, this._compare, this._maxNodeSize);
+    result._root = this._root;
+    result._size = this._size;
+    return result;
+  }
+
+  /** Performs a greedy clone, immediately duplicating any nodes that are 
+   *  not currently marked as shared, in order to avoid marking any nodes
+   *  as shared.
+   *  @param force Clone all nodes, even shared ones.
+   */
+  greedyClone(force?: boolean): BTree<K,V> {
+    var result = new BTree<K,V>(undefined, this._compare, this._maxNodeSize);
+    result._root = this._root.greedyClone(force);
+    result._size = this._size;
+    return result;
+  }
+
+  /** Gets an array filled with the contents of the tree, sorted by key */
+  toArray(maxLength: number = 0x7FFFFFFF): [K,V][] {
+    let min = this.minKey(), max = this.maxKey();
+    if (min !== undefined)
+      return this.getRange(min, max!, true, maxLength)
+    return [];
+  }
+
+  /** Gets an array of all keys, sorted */
+  keysArray() {
+    var results: K[] = [];
+    this._root.forRange(this.minKey()!, this.maxKey()!, true, false, this, 0, 
+      (k,v) => { results.push(k); });
+    return results;
+  }
+  
+  /** Gets an array of all values, sorted by key */
+  valuesArray() {
+    var results: V[] = [];
+    this._root.forRange(this.minKey()!, this.maxKey()!, true, false, this, 0,
+      (k,v) => { results.push(v); });
+    return results;
+  }
+
+  /** Gets a string representing the tree's data based on toArray(). */
+  toString() {
+    return this.toArray().toString();
+  }
+
+  /** Stores a key-value pair only if the key doesn't already exist in the tree. 
+   * @returns true if a new key was added
+  */
+  setIfNotPresent(key: K, value: V): boolean {
+    return this.set(key, value, false);
+  }
+
+  /** Returns the next pair whose key is larger than the specified key (or undefined if there is none) */
+  nextHigherPair(key: K): [K,V]|undefined {
+    var it = this.entries(key, ReusedArray);
+    var r = it.next();
+    if (!r.done && this._compare(r.value[0], key) <= 0)
+      r = it.next();
+    return r.value;
+  }
+  
+  /** Returns the next key larger than the specified key (or undefined if there is none) */
+  nextHigherKey(key: K): K|undefined {
+    var p = this.nextHigherPair(key);
+    return p ? p[0] : p;
+  }
+
+  /** Returns the next pair whose key is smaller than the specified key (or undefined if there is none) */
+  nextLowerPair(key: K): [K,V]|undefined {
+    var it = this.entriesReversed(key, ReusedArray, true);
+    return it.next().value;
+  }
+  
+  /** Returns the next key smaller than the specified key (or undefined if there is none) */
+  nextLowerKey(key: K): K|undefined {
+    var p = this.nextLowerPair(key);
+    return p ? p[0] : p;
+  }
+
+  /** Edits the value associated with a key in the tree, if it already exists. 
+   * @returns true if the key existed, false if not.
+  */
+  changeIfPresent(key: K, value: V): boolean { 
+    return this.editRange(key, key, true, (k,v) => ({value})) !== 0;
+  }
+
+  /**
+   * Builds an array of pairs from the specified range of keys, sorted by key.
+   * Each returned pair is also an array: pair[0] is the key, pair[1] is the value.
+   * @param low The first key in the array will be greater than or equal to `low`.
+   * @param high This method returns when a key larger than this is reached.
+   * @param includeHigh If the `high` key is present, its pair will be included
+   *        in the output if and only if this parameter is true. Note: if the
+   *        `low` key is present, it is always included in the output.
+   * @param maxLength Length limit. getRange will stop scanning the tree when 
+   *                  the array reaches this size.
+   * @description Computational complexity: O(result.length + log size)
+   */
+  getRange(low: K, high: K, includeHigh?: boolean, maxLength: number = 0x3FFFFFF): [K,V][] {
+    var results: [K,V][] = [];
+    this._root.forRange(low, high, includeHigh, false, this, 0, (k,v) => {
+      results.push([k,v])
+      return results.length > maxLength ? Break : undefined;
+    });
+    return results;
+  }
+
+  /** Adds all pairs from a list of key-value pairs.
+   * @param pairs Pairs to add to this tree. If there are duplicate keys, 
+   *        later pairs currently overwrite earlier ones (e.g. [[0,1],[0,7]] 
+   *        associates 0 with 7.)
+   * @param overwrite Whether to overwrite pairs that already exist (if false,
+   *        pairs[i] is ignored when the key pairs[i][0] already exists.)
+   * @returns The number of pairs added to the collection.
+   * @description Computational complexity: O(pairs.length * log(size + pairs.length))
+   */
+  setPairs(pairs: [K,V][], overwrite?: boolean): number {
+    var added = 0;
+    for (var i = 0; i < pairs.length; i++)
+      if (this.set(pairs[i][0], pairs[i][1], overwrite))
+        added++;
+    return added;
+  }
+
+  forRange(low: K, high: K, includeHigh: boolean, onFound?: (k:K,v:V,counter:number) => void, initialCounter?: number): number;
+
+  /**
+   * Scans the specified range of keys, in ascending order by key.
+   * Note: the callback `onFound` must not insert or remove items in the
+   * collection. Doing so may cause incorrect data to be sent to the 
+   * callback afterward.
+   * @param low The first key scanned will be greater than or equal to `low`.
+   * @param high Scanning stops when a key larger than this is reached.
+   * @param includeHigh If the `high` key is present, `onFound` is called for
+   *        that final pair if and only if this parameter is true.
+   * @param onFound A function that is called for each key-value pair. This 
+   *        function can return {break:R} to stop early with result R.
+   * @param initialCounter Initial third argument of onFound. This value 
+   *        increases by one each time `onFound` is called. Default: 0
+   * @returns The number of values found, or R if the callback returned 
+   *        `{break:R}` to stop early.
+   * @description Computational complexity: O(number of items scanned + log size)
+   */
+  forRange<R=number>(low: K, high: K, includeHigh: boolean, onFound?: (k:K,v:V,counter:number) => {break?:R}|void, initialCounter?: number): R|number {
+    var r = this._root.forRange(low, high, includeHigh, false, this, initialCounter || 0, onFound);
+    return typeof r === "number" ? r : r.break!;
+  }
+
+  /**
+   * Scans and potentially modifies values for a subsequence of keys.
+   * Note: the callback `onFound` should ideally be a pure function. 
+   *   Specfically, it must not insert items, call clone(), or change 
+   *   the collection except via return value; out-of-band editing may
+   *   cause an exception or may cause incorrect data to be sent to
+   *   the callback (duplicate or missed items). It must not cause a 
+   *   clone() of the collection, otherwise the clone could be modified
+   *   by changes requested by the callback.
+   * @param low The first key scanned will be greater than or equal to `low`.
+   * @param high Scanning stops when a key larger than this is reached.
+   * @param includeHigh If the `high` key is present, `onFound` is called for
+   *        that final pair if and only if this parameter is true.
+   * @param onFound A function that is called for each key-value pair. This 
+   *        function can return `{value:v}` to change the value associated 
+   *        with the current key, `{delete:true}` to delete the current pair,
+   *        `{break:R}` to stop early with result R, or it can return nothing
+   *        (undefined or {}) to cause no effect and continue iterating.
+   *        `{break:R}` can be combined with one of the other two commands.
+   *        The third argument `counter` is the number of items iterated 
+   *        previously; it equals 0 when `onFound` is called the first time.
+   * @returns The number of values scanned, or R if the callback returned 
+   *        `{break:R}` to stop early.
+   * @description 
+   *   Computational complexity: O(number of items scanned + log size)
+   *   Note: if the tree has been cloned with clone(), any shared
+   *   nodes are copied before `onFound` is called. This takes O(n) time 
+   *   where n is proportional to the amount of shared data scanned.
+   */
+  editRange<R=V>(low: K, high: K, includeHigh: boolean, onFound: (k:K,v:V,counter:number) => EditRangeResult<V,R>|void, initialCounter?: number): R|number {
+    var root = this._root;
+    if (root.isShared)
+      this._root = root = root.clone();
+    try {
+      var r = root.forRange(low, high, includeHigh, true, this, initialCounter || 0, onFound);
+      return typeof r === "number" ? r : r.break!;
+    } finally {
+      while (root.keys.length <= 1 && !root.isLeaf)
+        this._root = root = root.keys.length === 0 ? EmptyLeaf :
+                    (root as any as BNodeInternal<K,V>).children[0];
+    }
+  }
+
+  /** Same as `editRange` except that the callback is called for all pairs. */
+  editAll<R=V>(onFound: (k:K,v:V,counter:number) => EditRangeResult<V,R>|void, initialCounter?: number): R|number {
+    return this.editRange(this.minKey()!, this.maxKey()!, true, onFound, initialCounter);
+  }
+
+  /**
+   * Removes a range of key-value pairs from the B+ tree.
+   * @param low The first key scanned will be greater than or equal to `low`.
+   * @param high Scanning stops when a key larger than this is reached.
+   * @param includeHigh Specifies whether the `high` key, if present, is deleted.
+   * @returns The number of key-value pairs that were deleted.
+   * @description Computational complexity: O(log size + number of items deleted)
+   */
+  deleteRange(low: K, high: K, includeHigh: boolean): number {
+    return this.editRange(low, high, includeHigh, DeleteRange);
+  }
+
+  /** Deletes a series of keys from the collection. */
+  deleteKeys(keys: K[]): number {
+    for (var i = 0, r = 0; i < keys.length; i++)
+      if (this.delete(keys[i]))
+        r++;
+    return r;
+  }
+
+  /** Gets the height of the tree: the number of internal nodes between the 
+   *  BTree object and its leaf nodes (zero if there are no internal nodes). */
+  get height(): number {
+    for (var node = this._root, h = -1; node != null; h++)
+      node = (node as any).children;
+    return h;
+  }
+
+  /** Makes the object read-only to ensure it is not accidentally modified.
+   *  Freezing does not have to be permanent; unfreeze() reverses the effect.
+   *  This is accomplished by replacing mutator functions with a function 
+   *  that throws an Error. Compared to using a property (e.g. this.isFrozen) 
+   *  this implementation gives better performance in non-frozen BTrees.
+   */
+  freeze() {
+    var t = this as any;
+    // Note: all other mutators ultimately call set() or editRange() 
+    //       so we don't need to override those others.
+    t.clear = t.set = t.editRange = function() {
+      throw new Error("Attempted to modify a frozen BTree");
+    };
+  }
+
+  /** Ensures mutations are allowed, reversing the effect of freeze(). */
+  unfreeze() {
+    delete this.clear;
+    delete this.set;
+    delete this.editRange;
+  }
+
+  /** Returns true if the tree appears to be frozen. */
+  get isFrozen() {
+    return this.hasOwnProperty('editRange');
+  }
+
+  /** Scans the tree for signs of serious bugs (e.g. this.size doesn't match
+   *  number of elements, internal nodes not caching max element properly...)
+   *  Computational complexity: O(number of nodes), i.e. O(size). This method
+   *  skips the most expensive test - whether all keys are sorted - but it
+   *  does check that maxKey() of the children of internal nodes are sorted. */
+  checkValid() {
+    var size = this._root.checkValid(0, this);
+    check(size === this.size, "size mismatch: counted ", size, "but stored", this.size);
+  }
+}
+
+declare const Symbol: any;
+if (Symbol && Symbol.iterator) // iterator is equivalent to entries()
+  (BTree as any).prototype[Symbol.iterator] = BTree.prototype.entries;
+(BTree as any).prototype.where = BTree.prototype.filter;
+(BTree as any).prototype.setRange = BTree.prototype.setPairs;
+(BTree as any).prototype.add = BTree.prototype.set;
+
+function iterator<T>(next: () => {done:boolean,value?:T} = (() => ({ done:true, value:undefined }))): IterableIterator<T> {
+  var result: any = { next };
+  if (Symbol && Symbol.iterator)
+    result[Symbol.iterator] = function() { return this; };
+  return result;
+}
+  
+
+/** Leaf node / base class. **************************************************/
+class BNode<K,V> {
+  // If this is an internal node, _keys[i] is the highest key in children[i].
+  keys: K[];
+  values: V[];
+  isShared: true | undefined;
+  get isLeaf() { return (this as any).children === undefined; }
+  
+  constructor(keys: K[] = [], values?: V[]) {
+    this.keys = keys;
+    this.values = values || undefVals as any[];
+    this.isShared = undefined;
+  }
+
+  // Shared methods /////////////////////////////////////////////////////////
+
+  maxKey() {
+    return this.keys[this.keys.length-1];
+  }
+
+  // If key not found, returns i^failXor where i is the insertion index.
+  // Callers that don't care whether there was a match will set failXor=0.
+  indexOf(key: K, failXor: number, cmp: (a:K, b:K) => number): index {
+    // TODO: benchmark multiple search strategies
+    const keys = this.keys;
+    var lo = 0, hi = keys.length, mid = hi >> 1;
+    while(lo < hi) {
+      var c = cmp(keys[mid], key);
+      if (c < 0)
+        lo = mid + 1;
+      else if (c > 0) // key < keys[mid]
+        hi = mid;
+      else if (c === 0)
+        return mid;
+      else {
+        // c is NaN or otherwise invalid
+        if (key === key) // at least the search key is not NaN
+          return keys.length;
+        else
+          throw new Error("BTree: NaN was used as a key");
+      }
+      mid = (lo + hi) >> 1;
+    }
+    return mid ^ failXor;
+
+    // Unrolled version: benchmarks show same speed, not worth using
+    /*var i = 1, c: number = 0, sum = 0;
+    if (keys.length >= 4) {
+      i = 3;
+      if (keys.length >= 8) {
+        i = 7;
+        if (keys.length >= 16) {
+          i = 15;
+          if (keys.length >= 32) {
+            i = 31;
+            if (keys.length >= 64) {
+              i = 127;
+              i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 64 : -64;
+              sum += c;
+              i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 32 : -32;
+              sum += c;
+            }
+            i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 16 : -16;
+            sum += c;
+          }
+          i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 8 : -8;
+          sum += c;
+        }
+        i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 4 : -4;
+        sum += c;
+      }
+      i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 2 : -2;
+      sum += c;
+    }
+    i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 1 : -1;
+    c = i < keys.length ? cmp(keys[i], key) : 1;
+    sum += c;
+    if (c < 0) {
+      ++i;
+      c = i < keys.length ? cmp(keys[i], key) : 1;
+      sum += c;
+    }
+    if (sum !== sum) {
+      if (key === key) // at least the search key is not NaN
+        return keys.length ^ failXor;
+      else
+        throw new Error("BTree: NaN was used as a key");
+    }
+    return c === 0 ? i : i ^ failXor;*/
+  }
+
+  // Leaf Node: misc //////////////////////////////////////////////////////////
+
+  minKey() {
+    return this.keys[0];
+  }
+
+  clone(): BNode<K,V> {
+    var v = this.values;
+    return new BNode<K,V>(this.keys.slice(0), v === undefVals ? v : v.slice(0));
+  }
+
+  greedyClone(force?: boolean): BNode<K,V> {
+    return this.isShared && !force ? this : this.clone();
+  }
+
+  get(key: K, defaultValue: V|undefined, tree: BTree<K,V>): V|undefined {
+    var i = this.indexOf(key, -1, tree._compare);
+    return i < 0 ? defaultValue : this.values[i];
+  }
+
+  checkValid(depth: number, tree: BTree<K,V>): number {
+    var kL = this.keys.length, vL = this.values.length;
+    check(this.values === undefVals ? kL <= vL : kL === vL,
+      "keys/values length mismatch: depth", depth, "with lengths", kL, vL);
+    // Note: we don't check for "node too small" because sometimes a node
+    // can legitimately have size 1. This occurs if there is a batch 
+    // deletion, leaving a node of size 1, and the siblings are full so
+    // it can't be merged with adjacent nodes. However, the parent will
+    // verify that the average node size is at least half of the maximum.
+    check(depth == 0 || kL > 0, "empty leaf at depth", depth);
+    return kL;
+  }
+
+  // Leaf Node: set & node splitting //////////////////////////////////////////
+
+  set(key: K, value: V, overwrite: boolean|undefined, tree: BTree<K,V>): boolean|BNode<K,V> { 
+    var i = this.indexOf(key, -1, tree._compare);
+    if (i < 0) {
+      // key does not exist yet
+      i = ~i;
+      tree._size++;
+      
+      if (this.keys.length < tree._maxNodeSize) {
+        return this.insertInLeaf(i, key, value, tree);
+      } else {
+        // This leaf node is full and must split
+        var newRightSibling = this.splitOffRightSide(), target: BNode<K,V> = this;
+        if (i > this.keys.length) {
+          i -= this.keys.length;
+          target = newRightSibling;
+        }
+        target.insertInLeaf(i, key, value, tree);
+        return newRightSibling;
+      }
+    } else {
+      // Key already exists
+      if (overwrite !== false) {
+        if (value !== undefined)
+          this.reifyValues();
+        // usually this is a no-op, but some users may wish to edit the key
+        this.keys[i] = key;
+        this.values[i] = value;
+      }
+      return false;
+    }
+  }
+
+  reifyValues() {
+    if (this.values === undefVals)
+      return this.values = this.values.slice(0, this.keys.length);
+    return this.values;
+  }
+
+  insertInLeaf(i: index, key: K, value: V, tree: BTree<K,V>) {
+    this.keys.splice(i, 0, key);
+    if (this.values === undefVals) {
+      while (undefVals.length < tree._maxNodeSize)
+        undefVals.push(undefined);
+      if (value === undefined) {
+        return true;
+      } else {
+        this.values = undefVals.slice(0, this.keys.length - 1);
+      }
+    }
+    this.values.splice(i, 0, value);
+    return true;
+  }
+  
+  takeFromRight(rhs: BNode<K,V>) {
+    // Reminder: parent node must update its copy of key for this node
+    // assert: neither node is shared
+    // assert rhs.keys.length > (maxNodeSize/2 && this.keys.length<maxNodeSize)
+    var v = this.values;
+    if (rhs.values === undefVals) {
+      if (v !== undefVals)
+        v.push(undefined as any);
+    } else {
+      v = this.reifyValues();
+      v.push(rhs.values.shift()!);
+    }
+    this.keys.push(rhs.keys.shift()!);
+  }
+
+  takeFromLeft(lhs: BNode<K,V>) {
+    // Reminder: parent node must update its copy of key for this node
+    // assert: neither node is shared
+    // assert rhs.keys.length > (maxNodeSize/2 && this.keys.length<maxNodeSize)
+    var v = this.values;
+    if (lhs.values === undefVals) {
+      if (v !== undefVals)
+        v.unshift(undefined as any);
+    } else {
+      v = this.reifyValues();
+      v.unshift(lhs.values.pop()!);
+    }
+    this.keys.unshift(lhs.keys.pop()!);
+  }
+
+  splitOffRightSide(): BNode<K,V> {
+    // Reminder: parent node must update its copy of key for this node
+    var half = this.keys.length >> 1, keys = this.keys.splice(half);
+    var values = this.values === undefVals ? undefVals : this.values.splice(half);
+    return new BNode<K,V>(keys, values);
+  }
+
+  // Leaf Node: scanning & deletions //////////////////////////////////////////
+
+  forRange<R>(low: K, high: K, includeHigh: boolean|undefined, editMode: boolean, tree: BTree<K,V>, count: number,
+              onFound?: (k:K, v:V, counter:number) => EditRangeResult<V,R>|void): EditRangeResult<V,R>|number {
+    var cmp = tree._compare;
+    var iLow, iHigh;
+    if (high === low) {
+      if (!includeHigh)
+        return count;
+      iHigh = (iLow = this.indexOf(low, -1, cmp)) + 1;
+      if (iLow < 0)
+        return count;
+    } else {
+      iLow = this.indexOf(low, 0, cmp);
+      iHigh = this.indexOf(high, -1, cmp);
+      if (iHigh < 0)
+        iHigh = ~iHigh;
+      else if (includeHigh === true)
+        iHigh++;
+    }
+    var keys = this.keys, values = this.values;
+    if (onFound !== undefined) {
+      for(var i = iLow; i < iHigh; i++) {
+        var key = keys[i];
+        var result = onFound(key, values[i], count++);
+        if (result !== undefined) {
+          if (editMode === true) {
+            if (key !== keys[i] || this.isShared === true)
+              throw new Error("BTree illegally changed or cloned in editRange");
+            if (result.delete) {
+              this.keys.splice(i, 1);
+              if (this.values !== undefVals)
+                this.values.splice(i, 1);
+              tree._size--;
+              i--;
+              iHigh--;
+            } else if (result.hasOwnProperty('value')) {
+              values![i] = result.value!;
+            }
+          }
+          if (result.break !== undefined)
+            return result;
+        }
+      }
+    } else
+      count += iHigh - iLow;
+    return count;
+  }
+
+  /** Adds entire contents of right-hand sibling (rhs is left unchanged) */
+  mergeSibling(rhs: BNode<K,V>, _: number) {
+    this.keys.push.apply(this.keys, rhs.keys);
+    if (this.values === undefVals) {
+      if (rhs.values === undefVals)
+        return;
+      this.values = this.values.slice(0, this.keys.length);
+    }
+    this.values.push.apply(this.values, rhs.reifyValues());
+  }
+}
+
+/** Internal node (non-leaf node) ********************************************/
+class BNodeInternal<K,V> extends BNode<K,V> {
+  // Note: conventionally B+ trees have one fewer key than the number of 
+  // children, but I find it easier to keep the array lengths equal: each
+  // keys[i] caches the value of children[i].maxKey().
+  children: BNode<K,V>[];
+
+  constructor(children: BNode<K,V>[], keys?: K[]) {
+    if (!keys) {
+      keys = [];
+      for (var i = 0; i < children.length; i++)
+        keys[i] = children[i].maxKey();
+    }
+    super(keys);
+    this.children = children;
+  }
+
+  clone(): BNode<K,V> {
+    var children = this.children.slice(0);
+    for (var i = 0; i < children.length; i++)
+      children[i].isShared = true;
+    return new BNodeInternal<K,V>(children, this.keys.slice(0));
+  }
+
+  greedyClone(force?: boolean): BNode<K,V> {
+    if (this.isShared && !force)
+      return this;
+    var nu = new BNodeInternal<K,V>(this.children.slice(0), this.keys.slice(0));
+    for (var i = 0; i < nu.children.length; i++)
+      nu.children[i] = nu.children[i].greedyClone();
+    return nu;
+  }
+
+  minKey() {
+    return this.children[0].minKey();
+  }
+
+  get(key: K, defaultValue: V|undefined, tree: BTree<K,V>): V|undefined {
+    var i = this.indexOf(key, 0, tree._compare), children = this.children;
+    return i < children.length ? children[i].get(key, defaultValue, tree) : undefined;
+  }
+
+  checkValid(depth: number, tree: BTree<K,V>) : number {
+    var kL = this.keys.length, cL = this.children.length;
+    check(kL === cL, "keys/children length mismatch: depth", depth, "lengths", kL, cL);
+    check(kL > 1, "internal node has length", kL, "at depth", depth);
+    var size = 0, c = this.children, k = this.keys, childSize = 0;
+    for (var i = 0; i < cL; i++) {
+      size += c[i].checkValid(depth + 1, tree);
+      childSize += c[i].keys.length;
+      check(size >= childSize, "wtf"); // no way this will ever fail
+      check(i === 0 || c[i-1].constructor === c[i].constructor, "type mismatch");
+      if (c[i].maxKey() != k[i])
+        check(false, "keys[", i, "] =", k[i], "is wrong, should be ", c[i].maxKey(), "at depth", depth);
+      if (!(i === 0 || tree._compare(k[i-1], k[i]) < 0))
+        check(false, "sort violation at depth", depth, "index", i, "keys", k[i-1], k[i]);
+    }
+    var toofew = childSize < (tree.maxNodeSize >> 1)*cL;
+    if (toofew || childSize > tree.maxNodeSize*cL)
+      check(false, toofew ? "too few" : "too many", "children (", childSize, size, ") at depth", depth, ", maxNodeSize:", tree.maxNodeSize, "children.length:", cL);
+    return size;
+  }
+
+  // Internal Node: set & node splitting //////////////////////////////////////
+
+  set(key: K, value: V, overwrite: boolean|undefined, tree: BTree<K,V>): boolean|BNodeInternal<K,V> {
+    var c = this.children, max = tree._maxNodeSize, cmp = tree._compare;
+    var i = Math.min(this.indexOf(key, 0, cmp), c.length - 1), child = c[i];
+    
+    if (child.isShared)
+      c[i] = child = child.clone();
+    if (child.keys.length >= max) {
+      // child is full; inserting anything else will cause a split.
+      // Shifting an item to the left or right sibling may avoid a split.
+      // We can do a shift if the adjacent node is not full and if the
+      // current key can still be placed in the same node after the shift.
+      var other: BNode<K,V>;
+      if (i > 0 && (other = c[i-1]).keys.length < max && cmp(child.keys[0], key) < 0) {
+        if (other.isShared)
+          c[i-1] = other = other.clone();
+        other.takeFromRight(child);
+        this.keys[i-1] = other.maxKey();
+      } else if ((other = c[i+1]) !== undefined && other.keys.length < max && cmp(child.maxKey(), key) < 0) {
+        if (other.isShared)
+          c[i+1] = other = other.clone();
+        other.takeFromLeft(child);
+        this.keys[i] = c[i].maxKey();
+      }
+    }
+
+    var result = child.set(key, value, overwrite, tree);
+    if (result === false)
+      return false;
+    this.keys[i] = child.maxKey();
+    if (result === true)
+      return true;
+
+    // The child has split and `result` is a new right child... does it fit?
+    if (this.keys.length < max) { // yes
+      this.insert(i+1, result);
+      return true;
+    } else { // no, we must split also
+      var newRightSibling = this.splitOffRightSide(), target: BNodeInternal<K,V> = this;
+      if (cmp(result.maxKey(), this.maxKey()) > 0) {
+        target = newRightSibling;
+        i -= this.keys.length;
+      }
+      target.insert(i+1, result);
+      return newRightSibling;
+    }
+  }
+
+  insert(i: index, child: BNode<K,V>) {
+    this.children.splice(i, 0, child);
+    this.keys.splice(i, 0, child.maxKey());
+  }
+
+  splitOffRightSide() {
+    var half = this.children.length >> 1;
+    return new BNodeInternal<K,V>(this.children.splice(half), this.keys.splice(half));
+  }
+
+  takeFromRight(rhs: BNode<K,V>) {
+    // Reminder: parent node must update its copy of key for this node
+    // assert: neither node is shared
+    // assert rhs.keys.length > (maxNodeSize/2 && this.keys.length<maxNodeSize)
+    this.keys.push(rhs.keys.shift()!);
+    this.children.push((rhs as BNodeInternal<K,V>).children.shift()!);
+  }
+
+  takeFromLeft(lhs: BNode<K,V>) {
+    // Reminder: parent node must update its copy of key for this node
+    // assert: neither node is shared
+    // assert rhs.keys.length > (maxNodeSize/2 && this.keys.length<maxNodeSize)
+    this.keys.unshift(lhs.keys.pop()!);
+    this.children.unshift((lhs as BNodeInternal<K,V>).children.pop()!);
+  }
+
+  // Internal Node: scanning & deletions //////////////////////////////////////
+
+  forRange<R>(low: K, high: K, includeHigh: boolean|undefined, editMode: boolean, tree: BTree<K,V>, count: number,
+    onFound?: (k:K, v:V, counter:number) => EditRangeResult<V,R>|void): EditRangeResult<V,R>|number
+  {
+    var cmp = tree._compare;
+    var iLow = this.indexOf(low, 0, cmp), i = iLow;
+    var iHigh = Math.min(high === low ? iLow : this.indexOf(high, 0, cmp), this.keys.length-1);
+    var keys = this.keys, children = this.children;
+    if (!editMode) {
+      // Simple case
+      for(; i <= iHigh; i++) {
+        var result = children[i].forRange(low, high, includeHigh, editMode, tree, count, onFound);
+        if (typeof result !== 'number')
+          return result;
+        count = result;
+      }
+    } else if (i <= iHigh) {
+      try {
+        for(; i <= iHigh; i++) {
+          if (children[i].isShared)
+            children[i] = children[i].clone();
+          var result = children[i].forRange(low, high, includeHigh, editMode, tree, count, onFound);
+          keys[i] = children[i].maxKey();
+          if (typeof result !== 'number')
+            return result;
+          count = result;
+        }
+      } finally {
+        // Deletions may have occurred, so look for opportunities to merge nodes.
+        var half = tree._maxNodeSize >> 1;
+        if (iLow > 0)
+          iLow--;
+        for(i = iHigh; i >= iLow; i--) {
+          if (children[i].keys.length <= half)
+            this.tryMerge(i, tree._maxNodeSize);
+        }
+        // Are we completely empty?
+        if (children[0].keys.length === 0) {
+          check(children.length === 1 && keys.length === 1, "emptiness bug");
+          children.shift();
+          keys.shift();
+        }
+      }
+    }
+    return count;
+  }
+
+  /** Merges child i with child i+1 if their combined size is not too large */
+  tryMerge(i: index, maxSize: number): boolean {
+    var children = this.children;
+    if (i >= 0 && i + 1 < children.length) {
+      if (children[i].keys.length + children[i+1].keys.length <= maxSize) {
+        if (children[i].isShared) // cloned already UNLESS i is outside scan range
+          children[i] = children[i].clone();
+        children[i].mergeSibling(children[i+1], maxSize);
+        children.splice(i + 1, 1);
+        this.keys.splice(i + 1, 1);
+        this.keys[i] = children[i].maxKey();
+        return true;
+      }
+    }
+    return false;
+  }
+
+  mergeSibling(rhs: BNode<K,V>, maxNodeSize: number) {
+    // assert !this.isShared;
+    var oldLength = this.keys.length;
+    this.keys.push.apply(this.keys, rhs.keys);
+    this.children.push.apply(this.children, (rhs as any as BNodeInternal<K,V>).children);
+    // If our children are themselves almost empty due to a mass-delete,
+    // they may need to be merged too (but only the oldLength-1 and its
+    // right sibling should need this).
+    this.tryMerge(oldLength-1, maxNodeSize);
+  }
+}
+
+// Optimization: this array of `undefined`s is used instead of a normal
+// array of values in nodes where `undefined` is the only value.
+// Its length is extended to max node size on first use; since it can
+// be shared between trees with different maximums, its length can only
+// increase, never decrease. Its type should be undefined[] but strangely
+// TypeScript won't allow the comparison V[] === undefined[]. To prevent
+// users from making this array too large, BTree has a maximum node size.
+var undefVals: any[] = [];
+
+const Delete = {delete: true}, DeleteRange = () => Delete;
+const Break = {break: true};
+const EmptyLeaf = (function() { 
+  var n = new BNode<any,any>(); n.isShared = true; return n;
+})();
+const EmptyArray: any[] = [];
+const ReusedArray: any[] = []; // assumed thread-local
+
+function check(fact: boolean, ...args: any[]) {
+  if (!fact) {
+    args.unshift('B+ tree '); // at beginning of message
+    throw new Error(args.join(' '));
+  }
+}
+
+/** A BTree frozen in the empty state. */
+export const EmptyBTree = (() => { let t = new BTree(); t.freeze(); return t; })();
\ No newline at end of file
diff --git a/packages/idb-bridge/src/tree/interfaces.ts b/packages/idb-bridge/src/tree/interfaces.ts
new file mode 100644
index 000000000..c708c20b5
--- /dev/null
+++ b/packages/idb-bridge/src/tree/interfaces.ts
@@ -0,0 +1,329 @@
+/*
+Copyright (c) 2018 David Piepgrass
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+SPDX-License-Identifier: MIT
+*/
+
+// Original repository: https://github.com/qwertie/btree-typescript
+
+
+/** Read-only set interface (subinterface of IMapSource<K,any>).
+ *  The word "set" usually means that each item in the collection is unique
+ *  (appears only once, based on a definition of equality used by the 
+ *  collection.) Objects conforming to this interface aren't guaranteed not 
+ *  to contain duplicates, but as an example, BTree<K,V> implements this 
+ *  interface and does not allow duplicates. */
+export interface ISetSource<K=any>
+{
+  /** Returns the number of key/value pairs in the map object. */
+  size: number;
+  /** Returns a boolean asserting whether the key exists in the map object or not. */
+  has(key: K): boolean;
+  /** Returns a new iterator for iterating the items in the set (the order is implementation-dependent). */
+  keys(): IterableIterator<K>;
+}
+
+/** Read-only map interface (i.e. a source of key-value pairs). */
+export interface IMapSource<K=any, V=any> extends ISetSource<K>
+{
+  /** Returns the number of key/value pairs in the map object. */
+  size: number;
+  /** Returns the value associated to the key, or undefined if there is none. */
+  get(key: K): V|undefined;
+  /** Returns a boolean asserting whether the key exists in the map object or not. */
+  has(key: K): boolean;
+  /** Calls callbackFn once for each key-value pair present in the map object.
+   *  The ES6 Map class sends the value to the callback before the key, so
+   *  this interface must do likewise. */
+  forEach(callbackFn: (v:V, k:K, map:IMapSource<K,V>) => void, thisArg: any): void;
+  
+  /** Returns an iterator that provides all key-value pairs from the collection (as arrays of length 2). */
+  entries(): IterableIterator<[K,V]>;
+  /** Returns a new iterator for iterating the keys of each pair. */
+  keys(): IterableIterator<K>;
+  /** Returns a new iterator for iterating the values of each pair. */
+  values(): IterableIterator<V>;
+  // TypeScript compiler decided Symbol.iterator has type 'any'
+  //[Symbol.iterator](): IterableIterator<[K,V]>;
+}
+
+/** Write-only set interface (the set cannot be queried, but items can be added to it.) 
+ *  @description Note: BTree<K,V> does not officially implement this interface,
+ *               but BTree<K> can be used as an instance of ISetSink<K>. */
+export interface ISetSink<K=any>
+{
+  /** Adds the specified item to the set, if it was not in the set already. */
+  add(key: K): any;
+  /** Returns true if an element in the map object existed and has been 
+   *  removed, or false if the element did not exist. */
+  delete(key: K): boolean;
+  /** Removes everything so that the set is empty. */
+  clear(): void;
+}
+
+/** Write-only map interface (i.e. a drain into which key-value pairs can be "sunk") */
+export interface IMapSink<K=any, V=any>
+{
+  /** Returns true if an element in the map object existed and has been 
+   *  removed, or false if the element did not exist. */
+  delete(key: K): boolean;
+  /** Sets the value for the key in the map object (the return value is 
+   *  boolean in BTree but Map returns the Map itself.) */
+  set(key: K, value: V): any;
+  /** Removes all key/value pairs from the IMap object. */
+  clear(): void;
+}
+
+/** Set interface.
+ *  @description Note: BTree<K,V> does not officially implement this interface,
+ *               but BTree<K> can be used as an instance of ISet<K>. */
+export interface ISet<K=any> extends ISetSource<K>, ISetSink<K> { }
+
+/** An interface compatible with ES6 Map and BTree. This interface does not
+ *  describe the complete interface of either class, but merely the common 
+ *  interface shared by both. */
+export interface IMap<K=any, V=any> extends IMapSource<K, V>, IMapSink<K, V> { }
+
+/** An data source that provides read-only access to a set of items called
+ *  "keys" in sorted order. This is a subinterface of ISortedMapSource. */
+export interface ISortedSetSource<K=any> extends ISetSource<K>
+{
+  /** Gets the lowest key in the collection. */
+  minKey(): K | undefined;
+  /** Gets the highest key in the collection. */
+  maxKey(): K | undefined;
+  /** Returns the next key larger than the specified key (or undefined if there is none) */
+  nextHigherKey(key: K): K|undefined;
+  /** Returns the next key smaller than the specified key (or undefined if there is none) */
+  nextLowerKey(key: K): K|undefined;
+  /** Calls `callback` on the specified range of keys, in ascending order by key.
+   * @param low The first key scanned will be greater than or equal to `low`.
+   * @param high Scanning stops when a key larger than this is reached.
+   * @param includeHigh If the `high` key is present in the map, `onFound` is called 
+   *        for that final pair if and only if this parameter is true.
+   * @param onFound A function that is called for each key pair. Because this
+   *        is a subinterface of ISortedMapSource, if there is a value 
+   *        associated with the key, it is passed as the second parameter.
+   * @param initialCounter Initial third argument of `onFound`. This value 
+   *        increases by one each time `onFound` is called. Default: 0
+   * @returns Number of pairs found and the number of times `onFound` was called.
+   */
+  forRange(low: K, high: K, includeHigh: boolean, onFound?: (k:K,v:any,counter:number) => void, initialCounter?: number): number;
+  /** Returns a new iterator for iterating the keys of each pair in ascending order. 
+   *  @param firstKey: Minimum key to include in the output. */
+  keys(firstKey?: K): IterableIterator<K>;
+}
+
+/** An data source that provides read-only access to items in sorted order. */
+export interface ISortedMapSource<K=any, V=any> extends IMapSource<K, V>, ISortedSetSource<K>
+{
+  /** Returns the next pair whose key is larger than the specified key (or undefined if there is none) */
+  nextHigherPair(key: K): [K,V]|undefined;
+  /** Returns the next pair whose key is smaller than the specified key (or undefined if there is none) */
+  nextLowerPair(key: K): [K,V]|undefined;
+  /** Builds an array of pairs from the specified range of keys, sorted by key.
+   * Each returned pair is also an array: pair[0] is the key, pair[1] is the value.
+   * @param low The first key in the array will be greater than or equal to `low`.
+   * @param high This method returns when a key larger than this is reached.
+   * @param includeHigh If the `high` key is present in the map, its pair will be
+   *        included in the output if and only if this parameter is true. Note: 
+   *        if the `low` key is present, it is always included in the output.
+   * @param maxLength Maximum length of the returned array (default: unlimited)
+   * @description Computational complexity: O(result.length + log size)
+   */
+  getRange(low: K, high: K, includeHigh?: boolean, maxLength?: number): [K,V][];
+  /** Calls `callback` on the specified range of keys, in ascending order by key.
+   * @param low The first key scanned will be greater than or equal to `low`.
+   * @param high Scanning stops when a key larger than this is reached.
+   * @param includeHigh If the `high` key is present in the map, `onFound` is called 
+   *        for that final pair if and only if this parameter is true.
+   * @param onFound A function that is called for each key-value pair.
+   * @param initialCounter Initial third argument of onFound. This value 
+   *        increases by one each time `onFound` is called. Default: 0
+   * @returns Number of pairs found and the number of times `callback` was called.
+   */
+  forRange(low: K, high: K, includeHigh: boolean, onFound?: (k:K,v:V,counter:number) => void, initialCounter?: number): number;
+  /** Returns an iterator that provides items in order by key.
+   *  @param firstKey: Minimum key to include in the output. */
+  entries(firstKey?: K): IterableIterator<[K,V]>;
+  /** Returns a new iterator for iterating the keys of each pair in ascending order. 
+   *  @param firstKey: Minimum key to include in the output. */
+  keys(firstKey?: K): IterableIterator<K>;
+  /** Returns a new iterator for iterating the values of each pair in order by key. 
+   *  @param firstKey: Minimum key whose associated value is included in the output. */
+  values(firstKey?: K): IterableIterator<V>;
+  
+  // This method should logically be in IMapSource but is not supported by ES6 Map
+  /** Performs a reduce operation like the `reduce` method of `Array`. 
+   *  It is used to combine all pairs into a single value, or perform conversions. */
+  reduce<R>(callback: (previous:R,currentPair:[K,V],counter:number,tree:IMapF<K,V>) => R, initialValue: R): R;
+  /** Performs a reduce operation like the `reduce` method of `Array`. 
+   *  It is used to combine all pairs into a single value, or perform conversions. */
+  reduce<R>(callback: (previous:R|undefined,currentPair:[K,V],counter:number,tree:IMapF<K,V>) => R): R|undefined;
+}
+
+/** An interface for a set of keys (the combination of ISortedSetSource<K> and ISetSink<K>) */
+export interface ISortedSet<K=any> extends ISortedSetSource<K>, ISetSink<K> { }
+
+/** An interface for a sorted map (dictionary), 
+ *  not including functional/persistent methods. */
+export interface ISortedMap<K=any, V=any> extends IMap<K,V>, ISortedMapSource<K, V>
+{
+  // All of the following methods should be in IMap but are left out of IMap
+  // so that IMap is compatible with ES6 Map.
+
+  /** Adds or overwrites a key-value pair in the sorted map.
+   * @param key the key is used to determine the sort order of data in the tree.
+   * @param value data to associate with the key
+   * @param overwrite Whether to overwrite an existing key-value pair 
+   *        (default: true). If this is false and there is an existing
+   *        key-value pair then the call to this method has no effect.
+   * @returns true if a new key-value pair was added, false if the key 
+   *        already existed. */
+  set(key: K, value: V, overwrite?: boolean): boolean;
+  /** Adds all pairs from a list of key-value pairs.
+   * @param pairs Pairs to add to this tree. If there are duplicate keys, 
+   *        later pairs currently overwrite earlier ones (e.g. [[0,1],[0,7]] 
+   *        associates 0 with 7.)
+   * @param overwrite Whether to overwrite pairs that already exist (if false,
+   *        pairs[i] is ignored when the key pairs[i][0] already exists.)
+   * @returns The number of pairs added to the collection.
+   */
+  setPairs(pairs: [K,V][], overwrite?: boolean): number;
+  /** Deletes a series of keys from the collection. */
+  deleteKeys(keys: K[]): number;
+  /** Removes a range of key-value pairs from the B+ tree.
+   * @param low The first key deleted will be greater than or equal to `low`.
+   * @param high Deleting stops when a key larger than this is reached.
+   * @param includeHigh Specifies whether the `high` key, if present, is deleted.
+   * @returns The number of key-value pairs that were deleted. */
+  deleteRange(low: K, high: K, includeHigh: boolean): number;
+
+  // TypeScript requires these methods of ISortedMapSource to be repeated
+  entries(firstKey?: K): IterableIterator<[K,V]>;
+  keys(firstKey?: K): IterableIterator<K>;
+  values(firstKey?: K): IterableIterator<V>;
+}
+
+/** An interface for a functional set, in which the set object could be read-only 
+ *  but new versions of the set can be created by calling "with" or "without" 
+ *  methods to add or remove keys. This is a subinterface of IMapF<K,V>,
+ *  so the items in the set may be referred to as "keys". */
+export interface ISetF<K=any> extends ISetSource<K> {
+  /** Returns a copy of the set with the specified key included. 
+   *  @description You might wonder why this method accepts only one key 
+   *  instead of `...keys: K[]`. The reason is that the derived interface
+   *  IMapF expects the second parameter to be a value. Therefore
+   *  withKeys() is provided to set multiple keys at once. */
+  with(key: K): ISetF<K>;
+  /** Returns a copy of the set with the specified key removed. */
+  without(key: K): ISetF<K>;
+  /** Returns a copy of the tree with all the keys in the specified array present.
+   *  @param keys The keys to add.
+   *  @param returnThisIfUnchanged If true, the method returns `this` when
+   *         all of the keys are already present in the collection. The 
+   *         default value may be true or false depending on the concrete
+   *         implementation of the interface (in BTree, the default is false.) */
+  withKeys(keys: K[], returnThisIfUnchanged?: boolean): ISetF<K>;
+  /** Returns a copy of the tree with all the keys in the specified array removed. */
+  withoutKeys(keys: K[], returnThisIfUnchanged?: boolean): ISetF<K>;
+  /** Returns a copy of the tree with items removed whenever the callback 
+   *  function returns false.
+   *  @param callback A function to call for each item in the set.
+   *         The second parameter to `callback` exists because ISetF
+   *         is a subinterface of IMapF. If the object is a map, v
+   *         is the value associated with the key, otherwise v could be
+   *         undefined or another copy of the third parameter (counter). */
+  filter(callback: (k:K,v:any,counter:number) => boolean, returnThisIfUnchanged?: boolean): ISetF<K>;
+}
+
+/** An interface for a functional map, in which the map object could be read-only
+ *  but new versions of the map can be created by calling "with" or "without" 
+ *  methods to add or remove keys or key-value pairs. 
+ */
+export interface IMapF<K=any, V=any> extends IMapSource<K, V>, ISetF<K> {
+  /** Returns a copy of the tree with the specified key set (the value is undefined). */
+  with(key: K): IMapF<K,V|undefined>;
+  /** Returns a copy of the tree with the specified key-value pair set. */
+  with<V2>(key: K, value: V2, overwrite?: boolean): IMapF<K,V|V2>;
+  /** Returns a copy of the tree with the specified key-value pairs set. */
+  withPairs<V2>(pairs: [K,V|V2][], overwrite: boolean): IMapF<K,V|V2>;
+  /** Returns a copy of the tree with all the keys in the specified array present.
+   *  @param keys The keys to add. If a key is already present in the tree,
+   *         neither the existing key nor the existing value is modified. 
+   *  @param returnThisIfUnchanged If true, the method returns `this` when
+   *         all of the keys are already present in the collection. The 
+   *         default value may be true or false depending on the concrete
+   *         implementation of the interface (in BTree, the default is false.) */
+  withKeys(keys: K[], returnThisIfUnchanged?: boolean): IMapF<K,V|undefined>;
+  /** Returns a copy of the tree with all values altered by a callback function. */
+  mapValues<R>(callback: (v:V,k:K,counter:number) => R): IMapF<K,R>;
+  /** Performs a reduce operation like the `reduce` method of `Array`. 
+   *  It is used to combine all pairs into a single value, or perform conversions. */
+  reduce<R>(callback: (previous:R,currentPair:[K,V],counter:number,tree:IMapF<K,V>) => R, initialValue: R): R;
+  /** Performs a reduce operation like the `reduce` method of `Array`. 
+   *  It is used to combine all pairs into a single value, or perform conversions. */
+  reduce<R>(callback: (previous:R|undefined,currentPair:[K,V],counter:number,tree:IMapF<K,V>) => R): R|undefined;
+
+  // Update return types in ISetF
+  without(key: K): IMapF<K,V>;
+  withoutKeys(keys: K[], returnThisIfUnchanged?: boolean): IMapF<K,V>;
+  /** Returns a copy of the tree with pairs removed whenever the callback 
+   *  function returns false. */
+  filter(callback: (k:K,v:V,counter:number) => boolean, returnThisIfUnchanged?: boolean): IMapF<K,V>;
+}
+
+/** An interface for a functional sorted set: a functional set in which the 
+ *  keys (items) are sorted. This is a subinterface of ISortedMapF. */
+export interface ISortedSetF<K=any> extends ISetF<K>, ISortedSetSource<K>
+{
+  // TypeScript requires this method of ISortedSetSource to be repeated
+  keys(firstKey?: K): IterableIterator<K>;
+}
+
+export interface ISortedMapF<K=any,V=any> extends ISortedSetF<K>, IMapF<K,V>, ISortedMapSource<K,V>
+{
+  /** Returns a copy of the tree with the specified range of keys removed. */
+  withoutRange(low: K, high: K, includeHigh: boolean, returnThisIfUnchanged?: boolean): ISortedMapF<K,V>;
+
+  // TypeScript requires these methods of ISortedSetF and ISortedMapSource to be repeated
+  entries(firstKey?: K): IterableIterator<[K,V]>;
+  keys(firstKey?: K): IterableIterator<K>;
+  values(firstKey?: K): IterableIterator<V>;
+  forRange(low: K, high: K, includeHigh: boolean, onFound?: (k:K,v:V,counter:number) => void, initialCounter?: number): number;
+
+  // Update the return value of methods from base interfaces
+  with(key: K): ISortedMapF<K,V|undefined>;
+  with<V2>(key: K, value: V2, overwrite?: boolean): ISortedMapF<K,V|V2>;
+  withKeys(keys: K[], returnThisIfUnchanged?: boolean): ISortedMapF<K,V|undefined>;
+  withPairs<V2>(pairs: [K,V|V2][], overwrite: boolean): ISortedMapF<K,V|V2>;
+  mapValues<R>(callback: (v:V,k:K,counter:number) => R): ISortedMapF<K,R>;
+  without(key: K): ISortedMapF<K,V>;
+  withoutKeys(keys: K[], returnThisIfUnchanged?: boolean): ISortedMapF<K,V>;
+  filter(callback: (k:K,v:any,counter:number) => boolean, returnThisIfUnchanged?: boolean): ISortedMapF<K,V>;
+}
+
+export interface ISortedMapConstructor<K,V> {
+    new (entries?: [K,V][], compare?: (a: K, b: K) => number): ISortedMap<K,V>;
+}
+export interface ISortedMapFConstructor<K,V> {
+    new (entries?: [K,V][], compare?: (a: K, b: K) => number): ISortedMapF<K,V>;
+}
\ No newline at end of file
diff --git a/packages/idb-bridge/src/util/FakeEvent.ts b/packages/idb-bridge/src/util/FakeEvent.ts
new file mode 100644
index 000000000..bf17f7e72
--- /dev/null
+++ b/packages/idb-bridge/src/util/FakeEvent.ts
@@ -0,0 +1,80 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+*/
+
+
+import FakeEventTarget from "./FakeEventTarget";
+import { EventType } from "./types";
+
+class Event {
+    public eventPath: FakeEventTarget[] = [];
+    public type: EventType;
+
+    public readonly NONE = 0;
+    public readonly CAPTURING_PHASE = 1;
+    public readonly AT_TARGET = 2;
+    public readonly BUBBLING_PHASE = 3;
+
+    // Flags
+    public propagationStopped = false;
+    public immediatePropagationStopped = false;
+    public canceled = false;
+    public initialized = true;
+    public dispatched = false;
+
+    public target: FakeEventTarget | null = null;
+    public currentTarget: FakeEventTarget | null = null;
+
+    public eventPhase: 0 | 1 | 2 | 3 = 0;
+
+    public defaultPrevented = false;
+
+    public isTrusted = false;
+    public timeStamp = Date.now();
+
+    public bubbles: boolean;
+    public cancelable: boolean;
+
+    constructor(
+        type: EventType,
+        eventInitDict: { bubbles?: boolean; cancelable?: boolean } = {},
+    ) {
+        this.type = type;
+
+        this.bubbles =
+            eventInitDict.bubbles !== undefined ? eventInitDict.bubbles : false;
+        this.cancelable =
+            eventInitDict.cancelable !== undefined
+                ? eventInitDict.cancelable
+                : false;
+    }
+
+    public preventDefault() {
+        if (this.cancelable) {
+            this.canceled = true;
+        }
+    }
+
+    public stopPropagation() {
+        this.propagationStopped = true;
+    }
+
+    public stopImmediatePropagation() {
+        this.propagationStopped = true;
+        this.immediatePropagationStopped = true;
+    }
+}
+
+export default Event;
diff --git a/packages/idb-bridge/src/util/FakeEventTarget.ts b/packages/idb-bridge/src/util/FakeEventTarget.ts
new file mode 100644
index 000000000..3c7eaf468
--- /dev/null
+++ b/packages/idb-bridge/src/util/FakeEventTarget.ts
@@ -0,0 +1,177 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+
+import { InvalidStateError } from "./errors";
+import FakeEvent from "./FakeEvent";
+import { EventCallback, EventType } from "./types";
+
+type EventTypeProp =
+    | "onabort"
+    | "onblocked"
+    | "oncomplete"
+    | "onerror"
+    | "onsuccess"
+    | "onupgradeneeded"
+    | "onversionchange";
+
+interface Listener {
+    callback: EventCallback;
+    capture: boolean;
+    type: EventType;
+}
+
+const stopped = (event: FakeEvent, listener: Listener) => {
+    return (
+        event.immediatePropagationStopped ||
+        (event.eventPhase === event.CAPTURING_PHASE &&
+            listener.capture === false) ||
+        (event.eventPhase === event.BUBBLING_PHASE && listener.capture === true)
+    );
+};
+
+// http://www.w3.org/TR/dom/#concept-event-listener-invoke
+const invokeEventListeners = (event: FakeEvent, obj: FakeEventTarget) => {
+    event.currentTarget = obj;
+
+    // The callback might cause obj.listeners to mutate as we traverse it.
+    // Take a copy of the array so that nothing sneaks in and we don't lose
+    // our place.
+    for (const listener of obj.listeners.slice()) {
+        if (event.type !== listener.type || stopped(event, listener)) {
+            continue;
+        }
+
+        // @ts-ignore
+        listener.callback.call(event.currentTarget, event);
+    }
+
+    const typeToProp: { [key in EventType]: EventTypeProp } = {
+        abort: "onabort",
+        blocked: "onblocked",
+        complete: "oncomplete",
+        error: "onerror",
+        success: "onsuccess",
+        upgradeneeded: "onupgradeneeded",
+        versionchange: "onversionchange",
+    };
+    const prop = typeToProp[event.type];
+    if (prop === undefined) {
+        throw new Error(`Unknown event type: "${event.type}"`);
+    }
+
+    const callback = event.currentTarget[prop];
+    if (callback) {
+        const listener = {
+            callback,
+            capture: false,
+            type: event.type,
+        };
+        if (!stopped(event, listener)) {
+            // @ts-ignore
+            listener.callback.call(event.currentTarget, event);
+        }
+    }
+};
+
+abstract class FakeEventTarget {
+    public readonly listeners: Listener[] = [];
+
+    // These will be overridden in individual subclasses and made not readonly
+    public readonly onabort: EventCallback | null | undefined;
+    public readonly onblocked: EventCallback | null | undefined;
+    public readonly oncomplete: EventCallback | null | undefined;
+    public readonly onerror: EventCallback | null | undefined;
+    public readonly onsuccess: EventCallback | null | undefined;
+    public readonly onupgradeneeded: EventCallback | null | undefined;
+    public readonly onversionchange: EventCallback | null | undefined;
+
+    public addEventListener(
+        type: EventType,
+        callback: EventCallback,
+        capture = false,
+    ) {
+        this.listeners.push({
+            callback,
+            capture,
+            type,
+        });
+    }
+
+    public removeEventListener(
+        type: EventType,
+        callback: EventCallback,
+        capture = false,
+    ) {
+        const i = this.listeners.findIndex(listener => {
+            return (
+                listener.type === type &&
+                listener.callback === callback &&
+                listener.capture === capture
+            );
+        });
+
+        this.listeners.splice(i, 1);
+    }
+
+    // http://www.w3.org/TR/dom/#dispatching-events
+    public dispatchEvent(event: FakeEvent) {
+        if (event.dispatched || !event.initialized) {
+            throw new InvalidStateError("The object is in an invalid state.");
+        }
+        event.isTrusted = false;
+
+        event.dispatched = true;
+        event.target = this;
+        // NOT SURE WHEN THIS SHOULD BE SET        event.eventPath = [];
+
+        event.eventPhase = event.CAPTURING_PHASE;
+        for (const obj of event.eventPath) {
+            if (!event.propagationStopped) {
+                invokeEventListeners(event, obj);
+            }
+        }
+
+        event.eventPhase = event.AT_TARGET;
+        if (!event.propagationStopped) {
+            invokeEventListeners(event, event.target);
+        }
+
+        if (event.bubbles) {
+            event.eventPath.reverse();
+            event.eventPhase = event.BUBBLING_PHASE;
+            if (event.eventPath.length === 0 && event.type === "error") {
+                console.error("Unhandled error event: ", event.target);
+            }
+            for (const obj of event.eventPath) {
+                if (!event.propagationStopped) {
+                    invokeEventListeners(event, obj);
+                }
+            }
+        }
+
+        event.dispatched = false;
+        event.eventPhase = event.NONE;
+        event.currentTarget = null;
+
+        if (event.canceled) {
+            return false;
+        }
+        return true;
+    }
+}
+
+export default FakeEventTarget;
diff --git a/packages/idb-bridge/src/util/canInjectKey.ts b/packages/idb-bridge/src/util/canInjectKey.ts
new file mode 100644
index 000000000..c6c9c24ab
--- /dev/null
+++ b/packages/idb-bridge/src/util/canInjectKey.ts
@@ -0,0 +1,34 @@
+import { KeyPath, Value } from "./types";
+
+// http://w3c.github.io/IndexedDB/#check-that-a-key-could-be-injected-into-a-value
+const canInjectKey = (keyPath: KeyPath, value: Value) => {
+  if (Array.isArray(keyPath)) {
+    // tslint:disable-next-line max-line-length
+    throw new Error(
+      "The key paths used in this section are always strings and never sequences, since it is not possible to create a object store which has a key generator and also has a key path that is a sequence.",
+    );
+  }
+
+  const identifiers = keyPath.split(".");
+  if (identifiers.length === 0) {
+    throw new Error("Assert: identifiers is not empty");
+  }
+  identifiers.pop();
+
+  for (const identifier of identifiers) {
+    if (typeof value !== "object" && !Array.isArray(value)) {
+      return false;
+    }
+
+    const hop = value.hasOwnProperty(identifier);
+    if (!hop) {
+      return true;
+    }
+
+    value = value[identifier];
+  }
+
+  return typeof value === "object" || Array.isArray(value);
+};
+
+export default canInjectKey;
diff --git a/packages/idb-bridge/src/util/cmp.ts b/packages/idb-bridge/src/util/cmp.ts
new file mode 100644
index 000000000..9d0dc99a2
--- /dev/null
+++ b/packages/idb-bridge/src/util/cmp.ts
@@ -0,0 +1,108 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import { DataError } from "./errors";
+import valueToKey from "./valueToKey";
+
+const getType = (x: any) => {
+    if (typeof x === "number") {
+        return "Number";
+    }
+    if (x instanceof Date) {
+        return "Date";
+    }
+    if (Array.isArray(x)) {
+        return "Array";
+    }
+    if (typeof x === "string") {
+        return "String";
+    }
+    if (x instanceof ArrayBuffer) {
+        return "Binary";
+    }
+
+    throw new DataError();
+};
+
+// https://w3c.github.io/IndexedDB/#compare-two-keys
+const compareKeys = (first: any, second: any): -1 | 0 | 1 => {
+    if (second === undefined) {
+        throw new TypeError();
+    }
+
+    first = valueToKey(first);
+    second = valueToKey(second);
+
+    const t1 = getType(first);
+    const t2 = getType(second);
+
+    if (t1 !== t2) {
+        if (t1 === "Array") {
+            return 1;
+        }
+        if (
+            t1 === "Binary" &&
+            (t2 === "String" || t2 === "Date" || t2 === "Number")
+        ) {
+            return 1;
+        }
+        if (t1 === "String" && (t2 === "Date" || t2 === "Number")) {
+            return 1;
+        }
+        if (t1 === "Date" && t2 === "Number") {
+            return 1;
+        }
+        return -1;
+    }
+
+    if (t1 === "Binary") {
+        first = new Uint8Array(first);
+        second = new Uint8Array(second);
+    }
+
+    if (t1 === "Array" || t1 === "Binary") {
+        const length = Math.min(first.length, second.length);
+        for (let i = 0; i < length; i++) {
+            const result = compareKeys(first[i], second[i]);
+
+            if (result !== 0) {
+                return result;
+            }
+        }
+
+        if (first.length > second.length) {
+            return 1;
+        }
+        if (first.length < second.length) {
+            return -1;
+        }
+        return 0;
+    }
+
+    if (t1 === "Date") {
+        if (first.getTime() === second.getTime()) {
+            return 0;
+        }
+    } else {
+        if (first === second) {
+            return 0;
+        }
+    }
+
+    return first > second ? 1 : -1;
+};
+
+export default compareKeys;
diff --git a/packages/idb-bridge/src/util/deepEquals.ts b/packages/idb-bridge/src/util/deepEquals.ts
new file mode 100644
index 000000000..8d05ad21e
--- /dev/null
+++ b/packages/idb-bridge/src/util/deepEquals.ts
@@ -0,0 +1,75 @@
+/*
+Copyright (c) 2017 Evgeny Poberezkin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+
+
+
+const isArray = Array.isArray;
+const keyList = Object.keys;
+const hasProp = Object.prototype.hasOwnProperty;
+
+function deepEquals(a: any, b: any): boolean {
+  if (a === b) return true;
+
+  if (a && b && typeof a == "object" && typeof b == "object") {
+    const arrA = isArray(a);
+    const arrB = isArray(b);
+    let i;
+    let length;
+    let key;
+
+    if (arrA && arrB) {
+      length = a.length;
+      if (length != b.length) return false;
+      for (i = length; i-- !== 0; ) if (!deepEquals(a[i], b[i])) return false;
+      return true;
+    }
+
+    if (arrA != arrB) return false;
+
+    const dateA = a instanceof Date;
+    const dateB = b instanceof Date;
+    if (dateA != dateB) return false;
+    if (dateA && dateB) return a.getTime() == b.getTime();
+
+    const regexpA = a instanceof RegExp;
+    const regexpB = b instanceof RegExp;
+    if (regexpA != regexpB) return false;
+    if (regexpA && regexpB) return a.toString() == b.toString();
+
+    const keys = keyList(a);
+    length = keys.length;
+
+    if (length !== keyList(b).length) return false;
+
+    for (i = length; i-- !== 0; ) if (!hasProp.call(b, keys[i])) return false;
+
+    for (i = length; i-- !== 0; ) {
+      key = keys[i];
+      if (!deepEquals(a[key], b[key])) return false;
+    }
+
+    return true;
+  }
+
+  return a !== a && b !== b;
+}
diff --git a/packages/idb-bridge/src/util/enforceRange.ts b/packages/idb-bridge/src/util/enforceRange.ts
new file mode 100644
index 000000000..0cf3b6c85
--- /dev/null
+++ b/packages/idb-bridge/src/util/enforceRange.ts
@@ -0,0 +1,18 @@
+// https://heycam.github.io/webidl/#EnforceRange
+
+const enforceRange = (
+    num: number,
+    type: "MAX_SAFE_INTEGER" | "unsigned long",
+) => {
+    const min = 0;
+    const max = type === "unsigned long" ? 4294967295 : 9007199254740991;
+
+    if (isNaN(num) || num < min || num > max) {
+        throw new TypeError();
+    }
+    if (num >= 0) {
+        return Math.floor(num);
+    }
+};
+
+export default enforceRange;
diff --git a/packages/idb-bridge/src/util/errors.ts b/packages/idb-bridge/src/util/errors.ts
new file mode 100644
index 000000000..bbf9498c1
--- /dev/null
+++ b/packages/idb-bridge/src/util/errors.ts
@@ -0,0 +1,120 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+
+/* tslint:disable: max-classes-per-file max-line-length */
+
+const messages = {
+    AbortError:
+        "A request was aborted, for example through a call to IDBTransaction.abort.",
+    ConstraintError:
+        "A mutation operation in the transaction failed because a constraint was not satisfied. For example, an object such as an object store or index already exists and a request attempted to create a new one.",
+    DataCloneError:
+        "The data being stored could not be cloned by the internal structured cloning algorithm.",
+    DataError: "Data provided to an operation does not meet requirements.",
+    InvalidAccessError:
+        "An invalid operation was performed on an object. For example transaction creation attempt was made, but an empty scope was provided.",
+    InvalidStateError:
+        "An operation was called on an object on which it is not allowed or at a time when it is not allowed. Also occurs if a request is made on a source object that has been deleted or removed. Use TransactionInactiveError or ReadOnlyError when possible, as they are more specific variations of InvalidStateError.",
+    NotFoundError:
+        "The operation failed because the requested database object could not be found. For example, an object store did not exist but was being opened.",
+    ReadOnlyError:
+        'The mutating operation was attempted in a "readonly" transaction.',
+    TransactionInactiveError:
+        "A request was placed against a transaction which is currently not active, or which is finished.",
+    VersionError:
+        "An attempt was made to open a database using a lower version than the existing version.",
+};
+
+export class AbortError extends Error {
+    constructor(message = messages.AbortError) {
+        super();
+        this.name = "AbortError";
+        this.message = message;
+    }
+}
+
+export class ConstraintError extends Error {
+    constructor(message = messages.ConstraintError) {
+        super();
+        this.name = "ConstraintError";
+        this.message = message;
+    }
+}
+
+export class DataCloneError extends Error {
+    constructor(message = messages.DataCloneError) {
+        super();
+        this.name = "DataCloneError";
+        this.message = message;
+    }
+}
+
+export class DataError extends Error {
+    constructor(message = messages.DataError) {
+        super();
+        this.name = "DataError";
+        this.message = message;
+    }
+}
+
+export class InvalidAccessError extends Error {
+    constructor(message = messages.InvalidAccessError) {
+        super();
+        this.name = "InvalidAccessError";
+        this.message = message;
+    }
+}
+
+export class InvalidStateError extends Error {
+    constructor(message = messages.InvalidStateError) {
+        super();
+        this.name = "InvalidStateError";
+        this.message = message;
+    }
+}
+
+export class NotFoundError extends Error {
+    constructor(message = messages.NotFoundError) {
+        super();
+        this.name = "NotFoundError";
+        this.message = message;
+    }
+}
+
+export class ReadOnlyError extends Error {
+    constructor(message = messages.ReadOnlyError) {
+        super();
+        this.name = "ReadOnlyError";
+        this.message = message;
+    }
+}
+
+export class TransactionInactiveError extends Error {
+    constructor(message = messages.TransactionInactiveError) {
+        super();
+        this.name = "TransactionInactiveError";
+        this.message = message;
+    }
+}
+
+export class VersionError extends Error {
+    constructor(message = messages.VersionError) {
+        super();
+        this.name = "VersionError";
+        this.message = message;
+    }
+}
diff --git a/packages/idb-bridge/src/util/extractKey.ts b/packages/idb-bridge/src/util/extractKey.ts
new file mode 100644
index 000000000..fd14c5a64
--- /dev/null
+++ b/packages/idb-bridge/src/util/extractKey.ts
@@ -0,0 +1,55 @@
+import { Key, KeyPath, Value } from "./types";
+import valueToKey from "./valueToKey";
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-steps-for-extracting-a-key-from-a-value-using-a-key-path
+const extractKey = (keyPath: KeyPath, value: Value) => {
+  if (Array.isArray(keyPath)) {
+    const result: Key[] = [];
+
+    for (let item of keyPath) {
+      // This doesn't make sense to me based on the spec, but it is needed to pass the W3C KeyPath tests (see same
+      // comment in validateKeyPath)
+      if (
+        item !== undefined &&
+        item !== null &&
+        typeof item !== "string" &&
+        (item as any).toString
+      ) {
+        item = (item as any).toString();
+      }
+      result.push(valueToKey(extractKey(item, value)));
+    }
+
+    return result;
+  }
+
+  if (keyPath === "") {
+    return value;
+  }
+
+  let remainingKeyPath: string | null = keyPath;
+  let object = value;
+
+  while (remainingKeyPath !== null) {
+    let identifier;
+
+    const i = remainingKeyPath.indexOf(".");
+    if (i >= 0) {
+      identifier = remainingKeyPath.slice(0, i);
+      remainingKeyPath = remainingKeyPath.slice(i + 1);
+    } else {
+      identifier = remainingKeyPath;
+      remainingKeyPath = null;
+    }
+
+    if (!object.hasOwnProperty(identifier)) {
+      return;
+    }
+
+    object = object[identifier];
+  }
+
+  return object;
+};
+
+export default extractKey;
diff --git a/packages/idb-bridge/src/util/fakeDOMStringList.ts b/packages/idb-bridge/src/util/fakeDOMStringList.ts
new file mode 100644
index 000000000..5add17588
--- /dev/null
+++ b/packages/idb-bridge/src/util/fakeDOMStringList.ts
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2017 Jeremy Scheff
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+import { FakeDOMStringList } from "./types";
+
+// Would be nicer to sublcass Array, but I'd have to sacrifice Node 4 support to do that.
+
+const fakeDOMStringList = (arr: string[]): FakeDOMStringList => {
+  const arr2 = arr.slice();
+
+  Object.defineProperty(arr2, "contains", {
+    // tslint:disable-next-line object-literal-shorthand
+    value: (value: string) => arr2.indexOf(value) >= 0,
+  });
+
+  Object.defineProperty(arr2, "item", {
+    // tslint:disable-next-line object-literal-shorthand
+    value: (i: number) => arr2[i],
+  });
+
+  return arr2 as FakeDOMStringList;
+};
+
+export default fakeDOMStringList;
diff --git a/packages/idb-bridge/src/util/injectKey.ts b/packages/idb-bridge/src/util/injectKey.ts
new file mode 100644
index 000000000..89d3a01d8
--- /dev/null
+++ b/packages/idb-bridge/src/util/injectKey.ts
@@ -0,0 +1,48 @@
+import { KeyPath, Value, Key } from "./types";
+import canInjectKey from "./canInjectKey";
+import { DataError } from "./errors";
+import structuredClone from "./structuredClone";
+
+export function injectKey(keyPath: KeyPath, value: Value, key: Key): Value {
+  if (Array.isArray(keyPath)) {
+    // tslint:disable-next-line max-line-length
+    throw new Error(
+      "The key paths used in this section are always strings and never sequences, since it is not possible to create a object store which has a key generator and also has a key path that is a sequence.",
+    );
+  }
+
+  const identifiers = keyPath.split(".");
+  if (identifiers.length === 0) {
+    throw new Error("Assert: identifiers is not empty");
+  }
+
+  const lastIdentifier = identifiers.pop();
+
+  if (lastIdentifier === null || lastIdentifier === undefined) {
+    throw Error();
+  }
+
+  for (const identifier of identifiers) {
+    if (typeof value !== "object" && !Array.isArray(value)) {
+      return false;
+    }
+
+    const hop = value.hasOwnProperty(identifier);
+    if (!hop) {
+      return true;
+    }
+
+    value = value[identifier];
+  }
+
+  if (!(typeof value === "object" || Array.isArray(value))) {
+    throw new Error("can't inject key");
+  }
+
+  const newValue = structuredClone(value);
+  newValue[lastIdentifier] = structuredClone(key);
+
+  return newValue;
+}
+
+export default injectKey;
\ No newline at end of file
diff --git a/packages/idb-bridge/src/util/makeStoreKeyValue.ts b/packages/idb-bridge/src/util/makeStoreKeyValue.ts
new file mode 100644
index 000000000..4850cec26
--- /dev/null
+++ b/packages/idb-bridge/src/util/makeStoreKeyValue.ts
@@ -0,0 +1,92 @@
+import { Value, Key, KeyPath } from "./types";
+import extractKey from "./extractKey";
+import { DataError } from "./errors";
+import valueToKey from "./valueToKey";
+import structuredClone from "./structuredClone";
+import injectKey from "./injectKey";
+
+export interface StoreKeyResult {
+  updatedKeyGenerator: number;
+  key: Key;
+  value: Value;
+}
+
+export function makeStoreKeyValue(
+  value: Value,
+  key: Key | undefined,
+  currentKeyGenerator: number,
+  autoIncrement: boolean,
+  keyPath: KeyPath | null,
+): StoreKeyResult {
+  const haveKey = key !== undefined && key !== null;
+  const haveKeyPath = keyPath !== null && keyPath !== undefined;
+
+  // This models a decision table on (haveKey, haveKeyPath, autoIncrement)
+
+  value = structuredClone(value);
+
+  if (haveKey) {
+    if (haveKeyPath) {
+      // (yes, yes, no)
+      // (yes, yes, yes)
+      throw new DataError();
+    } else {
+      if (autoIncrement) {
+        // (yes, no, yes)
+        key = valueToKey(key)!;
+        let updatedKeyGenerator: number;
+        if (typeof key !== "number") {
+          updatedKeyGenerator = currentKeyGenerator;
+        } else {
+          updatedKeyGenerator = key;
+        }
+        return {
+          key: key!,
+          value: value,
+          updatedKeyGenerator,
+        };
+      } else {
+        // (yes, no, no)
+        throw new DataError();
+      }
+    }
+  } else {
+    if (haveKeyPath) {
+      if (autoIncrement) {
+        // (no, yes, yes)
+
+        let updatedKeyGenerator: number;
+        const maybeInlineKey = extractKey(keyPath!, value);
+        if (maybeInlineKey === undefined) {
+          value = injectKey(keyPath!, value, currentKeyGenerator);
+          key = currentKeyGenerator;
+          updatedKeyGenerator = currentKeyGenerator + 1;
+        } else if (typeof maybeInlineKey === "number") {
+          key = maybeInlineKey;
+          updatedKeyGenerator = maybeInlineKey;
+        } else {
+          key = maybeInlineKey;
+          updatedKeyGenerator = currentKeyGenerator + 1;
+        }
+        return {
+          key: key,
+          value: value,
+          updatedKeyGenerator,
+        }
+      } else {
+        // (no, yes, no)
+        key = extractKey(keyPath!, value);
+        key = valueToKey(key);
+        return {
+          key: key!,
+          value: value,
+          updatedKeyGenerator: currentKeyGenerator,
+        };
+      }
+    } else {
+      // (no, no, yes)
+      // (no, no, no)
+      throw new DataError();
+    }
+  }
+}
\ No newline at end of file
diff --git a/packages/idb-bridge/src/util/openPromise.ts b/packages/idb-bridge/src/util/openPromise.ts
new file mode 100644
index 000000000..3f6da81bd
--- /dev/null
+++ b/packages/idb-bridge/src/util/openPromise.ts
@@ -0,0 +1,22 @@
+function openPromise<T>(): {
+  promise: Promise<T>;
+  resolve: (v?: T | PromiseLike<T>) => void;
+  reject: (err?: any) => void;
+} {
+  let resolve;
+  let reject;
+  const promise = new Promise<T>((resolve2, reject2) => {
+    resolve = resolve2;
+    reject = reject2;
+  });
+  if (!resolve) {
+    throw Error("broken invariant");
+  }
+  if (!reject) {
+    throw Error("broken invariant");
+  }
+
+  return { promise, resolve, reject };
+}
+
+export default openPromise;
diff --git a/packages/idb-bridge/src/util/queueTask.ts b/packages/idb-bridge/src/util/queueTask.ts
new file mode 100644
index 000000000..7d59c2263
--- /dev/null
+++ b/packages/idb-bridge/src/util/queueTask.ts
@@ -0,0 +1,21 @@
+/*
+  Copyright 2019 Florian Dold
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+  or implied. See the License for the specific language governing
+  permissions and limitations under the License.
+ */
+
+ export function queueTask(fn: () => void) {
+   setImmediate(fn);
+ }
+
+ export default queueTask;
\ No newline at end of file
diff --git a/packages/idb-bridge/src/util/structuredClone.ts b/packages/idb-bridge/src/util/structuredClone.ts
new file mode 100644
index 000000000..8b6b61315
--- /dev/null
+++ b/packages/idb-bridge/src/util/structuredClone.ts
@@ -0,0 +1,15 @@
+
+function structuredCloneImpl(val: any, visited: WeakMap<any, boolean>): any {
+  // FIXME: replace with real implementation!
+  return JSON.parse(JSON.stringify(val));
+}
+
+/**
+ * Structured clone for IndexedDB.
+ */
+export function structuredClone(val: any): any {
+  const visited: WeakMap<any, boolean> = new WeakMap<any, boolean>();
+  return structuredCloneImpl(val, visited);
+}
+
+export default structuredClone;
\ No newline at end of file
diff --git a/packages/idb-bridge/src/util/types.ts b/packages/idb-bridge/src/util/types.ts
new file mode 100644
index 000000000..7aea22ab1
--- /dev/null
+++ b/packages/idb-bridge/src/util/types.ts
@@ -0,0 +1,73 @@
+/*
+ Copyright 2017 Jeremy Scheff
+ Copyright 2019 Florian Dold
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+*/
+
+import BridgeIDBRequest from "../BridgeIDBRequest";
+import BridgeIDBKeyRange from "../BridgeIDBKeyRange";
+import BridgeIDBIndex from "../BridgeIDBIndex";
+import BridgeIBObjectStore from "../BridgeIDBObjectStore";
+
+interface EventInCallback extends Event {
+  target: any;
+  error: Error | null;
+}
+
+export type EventCallback = (event: EventInCallback) => void;
+
+export type EventType =
+  | "abort"
+  | "blocked"
+  | "complete"
+  | "error"
+  | "success"
+  | "upgradeneeded"
+  | "versionchange";
+
+export type CursorSource = BridgeIDBIndex | BridgeIBObjectStore;
+
+
+export interface FakeDOMStringList extends Array<string> {
+  contains: (value: string) => boolean;
+  item: (i: number) => string | undefined;
+}
+
+export type BridgeIDBCursorDirection = "next" | "nextunique" | "prev" | "prevunique";
+
+export type KeyPath = string | string[];
+
+export type Key = any;
+
+export type CursorRange = Key | BridgeIDBKeyRange | undefined;
+
+export type Value = any;
+
+export interface Record {
+  key: Key;
+  value: Key | Value; // For indexes, will be Key. For object stores, will be Value.
+}
+
+export type TransactionMode = "readonly" | "readwrite" | "versionchange";
+
+export interface BridgeIDBDatabaseInfo {
+  name: string;
+  version: number
+};
+
+export interface RequestObj {
+  operation: () => Promise<any>;
+  request?: BridgeIDBRequest | undefined;
+  source?: any;
+}
diff --git a/packages/idb-bridge/src/util/validateKeyPath.ts b/packages/idb-bridge/src/util/validateKeyPath.ts
new file mode 100644
index 000000000..18552a5d4
--- /dev/null
+++ b/packages/idb-bridge/src/util/validateKeyPath.ts
@@ -0,0 +1,77 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+*/
+
+import { KeyPath } from "./types";
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-valid-key-path
+const validateKeyPath = (keyPath: KeyPath, parent?: "array" | "string") => {
+    // This doesn't make sense to me based on the spec, but it is needed to pass the W3C KeyPath tests (see same
+    // comment in extractKey)
+    if (
+        keyPath !== undefined &&
+        keyPath !== null &&
+        typeof keyPath !== "string" &&
+        keyPath.toString &&
+        (parent === "array" || !Array.isArray(keyPath))
+    ) {
+        keyPath = keyPath.toString();
+    }
+
+    if (typeof keyPath === "string") {
+        if (keyPath === "" && parent !== "string") {
+            return;
+        }
+        try {
+            // https://mathiasbynens.be/demo/javascript-identifier-regex for ECMAScript 5.1 / Unicode v7.0.0, with
+            // reserved words at beginning removed
+            // tslint:disable-next-line max-line-length
+            const validIdentifierRegex = /^(?:[\$A-Z_a-z\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0-\u08B2\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58\u0C59\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D60\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2160-\u2188\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA69D\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA7AD\uA7B0\uA7B1\uA7F7-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uA9E0-\uA9E4\uA9E6-\uA9EF\uA9FA-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB5F\uAB64\uAB65\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC])(?:[\$0-9A-Z_a-z\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0300-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u0483-\u0487\u048A-\u052F\u0531-\u0556\u0559\u0561-\u0587\u0591-\u05BD\u05BF\u05C1\u05C2\u05C4\u05C5\u05C7\u05D0-\u05EA\u05F0-\u05F2\u0610-\u061A\u0620-\u0669\u066E-\u06D3\u06D5-\u06DC\u06DF-\u06E8\u06EA-\u06FC\u06FF\u0710-\u074A\u074D-\u07B1\u07C0-\u07F5\u07FA\u0800-\u082D\u0840-\u085B\u08A0-\u08B2\u08E4-\u0963\u0966-\u096F\u0971-\u0983\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BC-\u09C4\u09C7\u09C8\u09CB-\u09CE\u09D7\u09DC\u09DD\u09DF-\u09E3\u09E6-\u09F1\u0A01-\u0A03\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A3C\u0A3E-\u0A42\u0A47\u0A48\u0A4B-\u0A4D\u0A51\u0A59-\u0A5C\u0A5E\u0A66-\u0A75\u0A81-\u0A83\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABC-\u0AC5\u0AC7-\u0AC9\u0ACB-\u0ACD\u0AD0\u0AE0-\u0AE3\u0AE6-\u0AEF\u0B01-\u0B03\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3C-\u0B44\u0B47\u0B48\u0B4B-\u0B4D\u0B56\u0B57\u0B5C\u0B5D\u0B5F-\u0B63\u0B66-\u0B6F\u0B71\u0B82\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BBE-\u0BC2\u0BC6-\u0BC8\u0BCA-\u0BCD\u0BD0\u0BD7\u0BE6-\u0BEF\u0C00-\u0C03\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D-\u0C44\u0C46-\u0C48\u0C4A-\u0C4D\u0C55\u0C56\u0C58\u0C59\u0C60-\u0C63\u0C66-\u0C6F\u0C81-\u0C83\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBC-\u0CC4\u0CC6-\u0CC8\u0CCA-\u0CCD\u0CD5\u0CD6\u0CDE\u0CE0-\u0CE3\u0CE6-\u0CEF\u0CF1\u0CF2\u0D01-\u0D03\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D-\u0D44\u0D46-\u0D48\u0D4A-\u0D4E\u0D57\u0D60-\u0D63\u0D66-\u0D6F\u0D7A-\u0D7F\u0D82\u0D83\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0DCA\u0DCF-\u0DD4\u0DD6\u0DD8-\u0DDF\u0DE6-\u0DEF\u0DF2\u0DF3\u0E01-\u0E3A\u0E40-\u0E4E\u0E50-\u0E59\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB9\u0EBB-\u0EBD\u0EC0-\u0EC4\u0EC6\u0EC8-\u0ECD\u0ED0-\u0ED9\u0EDC-\u0EDF\u0F00\u0F18\u0F19\u0F20-\u0F29\u0F35\u0F37\u0F39\u0F3E-\u0F47\u0F49-\u0F6C\u0F71-\u0F84\u0F86-\u0F97\u0F99-\u0FBC\u0FC6\u1000-\u1049\u1050-\u109D\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u135D-\u135F\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F8\u1700-\u170C\u170E-\u1714\u1720-\u1734\u1740-\u1753\u1760-\u176C\u176E-\u1770\u1772\u1773\u1780-\u17D3\u17D7\u17DC\u17DD\u17E0-\u17E9\u180B-\u180D\u1810-\u1819\u1820-\u1877\u1880-\u18AA\u18B0-\u18F5\u1900-\u191E\u1920-\u192B\u1930-\u193B\u1946-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u19D0-\u19D9\u1A00-\u1A1B\u1A20-\u1A5E\u1A60-\u1A7C\u1A7F-\u1A89\u1A90-\u1A99\u1AA7\u1AB0-\u1ABD\u1B00-\u1B4B\u1B50-\u1B59\u1B6B-\u1B73\u1B80-\u1BF3\u1C00-\u1C37\u1C40-\u1C49\u1C4D-\u1C7D\u1CD0-\u1CD2\u1CD4-\u1CF6\u1CF8\u1CF9\u1D00-\u1DF5\u1DFC-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u200C\u200D\u203F\u2040\u2054\u2071\u207F\u2090-\u209C\u20D0-\u20DC\u20E1\u20E5-\u20F0\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2160-\u2188\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D7F-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2DE0-\u2DFF\u2E2F\u3005-\u3007\u3021-\u302F\u3031-\u3035\u3038-\u303C\u3041-\u3096\u3099\u309A\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA62B\uA640-\uA66F\uA674-\uA67D\uA67F-\uA69D\uA69F-\uA6F1\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA7AD\uA7B0\uA7B1\uA7F7-\uA827\uA840-\uA873\uA880-\uA8C4\uA8D0-\uA8D9\uA8E0-\uA8F7\uA8FB\uA900-\uA92D\uA930-\uA953\uA960-\uA97C\uA980-\uA9C0\uA9CF-\uA9D9\uA9E0-\uA9FE\uAA00-\uAA36\uAA40-\uAA4D\uAA50-\uAA59\uAA60-\uAA76\uAA7A-\uAAC2\uAADB-\uAADD\uAAE0-\uAAEF\uAAF2-\uAAF6\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB5F\uAB64\uAB65\uABC0-\uABEA\uABEC\uABED\uABF0-\uABF9\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE00-\uFE0F\uFE20-\uFE2D\uFE33\uFE34\uFE4D-\uFE4F\uFE70-\uFE74\uFE76-\uFEFC\uFF10-\uFF19\uFF21-\uFF3A\uFF3F\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC])*$/;
+            if (keyPath.length >= 1 && validIdentifierRegex.test(keyPath)) {
+                return;
+            }
+        } catch (err) {
+            throw new SyntaxError(err.message);
+        }
+        if (keyPath.indexOf(" ") >= 0) {
+            throw new SyntaxError(
+                "The keypath argument contains an invalid key path (no spaces allowed).",
+            );
+        }
+    }
+
+    if (Array.isArray(keyPath) && keyPath.length > 0) {
+        if (parent) {
+            // No nested arrays
+            throw new SyntaxError(
+                "The keypath argument contains an invalid key path (nested arrays).",
+            );
+        }
+        for (const part of keyPath) {
+            validateKeyPath(part, "array");
+        }
+        return;
+    } else if (typeof keyPath === "string" && keyPath.indexOf(".") >= 0) {
+        keyPath = keyPath.split(".");
+        for (const part of keyPath) {
+            validateKeyPath(part, "string");
+        }
+        return;
+    }
+
+    throw new SyntaxError();
+};
+
+export default validateKeyPath;
diff --git a/packages/idb-bridge/src/util/valueToKey.ts b/packages/idb-bridge/src/util/valueToKey.ts
new file mode 100644
index 000000000..3a9e36786
--- /dev/null
+++ b/packages/idb-bridge/src/util/valueToKey.ts
@@ -0,0 +1,70 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+
+import { DataError } from "./errors";
+import { Key } from "./types";
+
+// https://w3c.github.io/IndexedDB/#convert-a-value-to-a-input
+function valueToKey(input: any, seen?: Set<object>): Key | Key[] {
+    if (typeof input === "number") {
+        if (isNaN(input)) {
+            throw new DataError();
+        }
+        return input;
+    } else if (input instanceof Date) {
+        const ms = input.valueOf();
+        if (isNaN(ms)) {
+            throw new DataError();
+        }
+        return new Date(ms);
+    } else if (typeof input === "string") {
+        return input;
+    } else if (
+        input instanceof ArrayBuffer ||
+        (typeof ArrayBuffer !== "undefined" &&
+            ArrayBuffer.isView &&
+            ArrayBuffer.isView(input))
+    ) {
+        if (input instanceof ArrayBuffer) {
+            return new Uint8Array(input).buffer;
+        }
+        return new Uint8Array(input.buffer).buffer;
+    } else if (Array.isArray(input)) {
+        if (seen === undefined) {
+            seen = new Set();
+        } else if (seen.has(input)) {
+            throw new DataError();
+        }
+        seen.add(input);
+
+        const keys = [];
+        for (let i = 0; i < input.length; i++) {
+            const hop = input.hasOwnProperty(i);
+            if (!hop) {
+                throw new DataError();
+            }
+            const entry = input[i];
+            const key = valueToKey(entry, seen);
+            keys.push(key);
+        }
+        return keys;
+    } else {
+        throw new DataError();
+    }
+};
+
+export default valueToKey;
diff --git a/packages/idb-bridge/tsconfig.json b/packages/idb-bridge/tsconfig.json
new file mode 100644
index 000000000..e17c3212b
--- /dev/null
+++ b/packages/idb-bridge/tsconfig.json
@@ -0,0 +1,14 @@
+{
+    "compilerOptions": {
+        "lib": ["es6"],
+        "module": "commonjs",
+        "target": "es5",
+        "noImplicitAny": true,
+        "sourceMap": false,
+        "outDir": "build",
+        "noEmitOnError": true,
+        "strict": true,
+        "incremental": true
+    },
+    "include": ["src/**/*"]
+}
diff --git a/packages/idb-bridge/yarn.lock b/packages/idb-bridge/yarn.lock
new file mode 100644
index 000000000..b7ece86d7
--- /dev/null
+++ b/packages/idb-bridge/yarn.lock
@@ -0,0 +1,3626 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"@ava/babel-plugin-throws-helper@^3.0.0":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@ava/babel-plugin-throws-helper/-/babel-plugin-throws-helper-3.0.0.tgz#2c933ec22da0c4ce1fc5369f2b95452c70420586"
+  integrity sha512-mN9UolOs4WX09QkheU1ELkVy2WPnwonlO3XMdN8JF8fQqRVgVTR21xDbvEOUsbwz6Zwjq7ji9yzyjuXqDPalxg==
+
+"@ava/babel-preset-stage-4@^2.0.0":
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/@ava/babel-preset-stage-4/-/babel-preset-stage-4-2.0.0.tgz#2cd072ff818e4432b87fd4c5fd5c5d1a405a4343"
+  integrity sha512-OWqMYeTSZ16AfLx0Vn0Uj7tcu+uMRlbKmks+DVCFlln7vomVsOtst+Oz+HCussDSFGpE+30VtHAUHLy6pLDpHQ==
+  dependencies:
+    "@babel/plugin-proposal-async-generator-functions" "^7.0.0"
+    "@babel/plugin-proposal-object-rest-spread" "^7.0.0"
+    "@babel/plugin-proposal-optional-catch-binding" "^7.0.0"
+    "@babel/plugin-transform-async-to-generator" "^7.0.0"
+    "@babel/plugin-transform-dotall-regex" "^7.0.0"
+    "@babel/plugin-transform-exponentiation-operator" "^7.0.0"
+    "@babel/plugin-transform-modules-commonjs" "^7.0.0"
+
+"@ava/babel-preset-transform-test-files@^5.0.0":
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/@ava/babel-preset-transform-test-files/-/babel-preset-transform-test-files-5.0.0.tgz#e06fc762069511e597531cc1120e22216aac6981"
+  integrity sha512-rqgyQwkT0+j2JzYP51dOv80u33rzAvjBtXRzUON+7+6u26mjoudRXci2+1s18rat8r4uOlZfbzm114YS6pwmYw==
+  dependencies:
+    "@ava/babel-plugin-throws-helper" "^3.0.0"
+    babel-plugin-espower "^3.0.1"
+
+"@ava/write-file-atomic@^2.2.0":
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/@ava/write-file-atomic/-/write-file-atomic-2.2.0.tgz#d625046f3495f1f5e372135f473909684b429247"
+  integrity sha512-BTNB3nGbEfJT+69wuqXFr/bQH7Vr7ihx2xGOMNqPgDGhwspoZhiWumDDZNjBy7AScmqS5CELIOGtPVXESyrnDA==
+  dependencies:
+    graceful-fs "^4.1.11"
+    imurmurhash "^0.1.4"
+    slide "^1.1.5"
+
+"@babel/code-frame@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.0.0.tgz#06e2ab19bdb535385559aabb5ba59729482800f8"
+  integrity sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==
+  dependencies:
+    "@babel/highlight" "^7.0.0"
+
+"@babel/core@^7.4.0":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/core/-/core-7.4.4.tgz#84055750b05fcd50f9915a826b44fa347a825250"
+  integrity sha512-lQgGX3FPRgbz2SKmhMtYgJvVzGZrmjaF4apZ2bLwofAKiSjxU0drPh4S/VasyYXwaTs+A1gvQ45BN8SQJzHsQQ==
+  dependencies:
+    "@babel/code-frame" "^7.0.0"
+    "@babel/generator" "^7.4.4"
+    "@babel/helpers" "^7.4.4"
+    "@babel/parser" "^7.4.4"
+    "@babel/template" "^7.4.4"
+    "@babel/traverse" "^7.4.4"
+    "@babel/types" "^7.4.4"
+    convert-source-map "^1.1.0"
+    debug "^4.1.0"
+    json5 "^2.1.0"
+    lodash "^4.17.11"
+    resolve "^1.3.2"
+    semver "^5.4.1"
+    source-map "^0.5.0"
+
+"@babel/generator@^7.0.0", "@babel/generator@^7.4.0", "@babel/generator@^7.4.4":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.4.4.tgz#174a215eb843fc392c7edcaabeaa873de6e8f041"
+  integrity sha512-53UOLK6TVNqKxf7RUh8NE851EHRxOOeVXKbK2bivdb+iziMyk03Sr4eaE9OELCbyZAAafAKPDwF2TPUES5QbxQ==
+  dependencies:
+    "@babel/types" "^7.4.4"
+    jsesc "^2.5.1"
+    lodash "^4.17.11"
+    source-map "^0.5.0"
+    trim-right "^1.0.1"
+
+"@babel/helper-annotate-as-pure@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0.tgz#323d39dd0b50e10c7c06ca7d7638e6864d8c5c32"
+  integrity sha512-3UYcJUj9kvSLbLbUIfQTqzcy5VX7GRZ/CCDrnOaZorFFM01aXp1+GJwuFGV4NDDoAS+mOUyHcO6UD/RfqOks3Q==
+  dependencies:
+    "@babel/types" "^7.0.0"
+
+"@babel/helper-builder-binary-assignment-operator-visitor@^7.1.0":
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-builder-binary-assignment-operator-visitor/-/helper-builder-binary-assignment-operator-visitor-7.1.0.tgz#6b69628dfe4087798e0c4ed98e3d4a6b2fbd2f5f"
+  integrity sha512-qNSR4jrmJ8M1VMM9tibvyRAHXQs2PmaksQF7c1CGJNipfe3D8p+wgNwgso/P2A2r2mdgBWAXljNWR0QRZAMW8w==
+  dependencies:
+    "@babel/helper-explode-assignable-expression" "^7.1.0"
+    "@babel/types" "^7.0.0"
+
+"@babel/helper-explode-assignable-expression@^7.1.0":
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-explode-assignable-expression/-/helper-explode-assignable-expression-7.1.0.tgz#537fa13f6f1674df745b0c00ec8fe4e99681c8f6"
+  integrity sha512-NRQpfHrJ1msCHtKjbzs9YcMmJZOg6mQMmGRB+hbamEdG5PNpaSm95275VD92DvJKuyl0s2sFiDmMZ+EnnvufqA==
+  dependencies:
+    "@babel/traverse" "^7.1.0"
+    "@babel/types" "^7.0.0"
+
+"@babel/helper-function-name@^7.1.0":
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz#a0ceb01685f73355d4360c1247f582bfafc8ff53"
+  integrity sha512-A95XEoCpb3TO+KZzJ4S/5uW5fNe26DjBGqf1o9ucyLyCmi1dXq/B3c8iaWTfBk3VvetUxl16e8tIrd5teOCfGw==
+  dependencies:
+    "@babel/helper-get-function-arity" "^7.0.0"
+    "@babel/template" "^7.1.0"
+    "@babel/types" "^7.0.0"
+
+"@babel/helper-get-function-arity@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz#83572d4320e2a4657263734113c42868b64e49c3"
+  integrity sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==
+  dependencies:
+    "@babel/types" "^7.0.0"
+
+"@babel/helper-module-imports@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-module-imports/-/helper-module-imports-7.0.0.tgz#96081b7111e486da4d2cd971ad1a4fe216cc2e3d"
+  integrity sha512-aP/hlLq01DWNEiDg4Jn23i+CXxW/owM4WpDLFUbpjxe4NS3BhLVZQ5i7E0ZrxuQ/vwekIeciyamgB1UIYxxM6A==
+  dependencies:
+    "@babel/types" "^7.0.0"
+
+"@babel/helper-module-transforms@^7.4.4":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-module-transforms/-/helper-module-transforms-7.4.4.tgz#96115ea42a2f139e619e98ed46df6019b94414b8"
+  integrity sha512-3Z1yp8TVQf+B4ynN7WoHPKS8EkdTbgAEy0nU0rs/1Kw4pDgmvYH3rz3aI11KgxKCba2cn7N+tqzV1mY2HMN96w==
+  dependencies:
+    "@babel/helper-module-imports" "^7.0.0"
+    "@babel/helper-simple-access" "^7.1.0"
+    "@babel/helper-split-export-declaration" "^7.4.4"
+    "@babel/template" "^7.4.4"
+    "@babel/types" "^7.4.4"
+    lodash "^4.17.11"
+
+"@babel/helper-plugin-utils@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-plugin-utils/-/helper-plugin-utils-7.0.0.tgz#bbb3fbee98661c569034237cc03967ba99b4f250"
+  integrity sha512-CYAOUCARwExnEixLdB6sDm2dIJ/YgEAKDM1MOeMeZu9Ld/bDgVo8aiWrXwcY7OBh+1Ea2uUcVRcxKk0GJvW7QA==
+
+"@babel/helper-regex@^7.4.4":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-regex/-/helper-regex-7.4.4.tgz#a47e02bc91fb259d2e6727c2a30013e3ac13c4a2"
+  integrity sha512-Y5nuB/kESmR3tKjU8Nkn1wMGEx1tjJX076HBMeL3XLQCu6vA/YRzuTW0bbb+qRnXvQGn+d6Rx953yffl8vEy7Q==
+  dependencies:
+    lodash "^4.17.11"
+
+"@babel/helper-remap-async-to-generator@^7.1.0":
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-remap-async-to-generator/-/helper-remap-async-to-generator-7.1.0.tgz#361d80821b6f38da75bd3f0785ece20a88c5fe7f"
+  integrity sha512-3fOK0L+Fdlg8S5al8u/hWE6vhufGSn0bN09xm2LXMy//REAF8kDCrYoOBKYmA8m5Nom+sV9LyLCwrFynA8/slg==
+  dependencies:
+    "@babel/helper-annotate-as-pure" "^7.0.0"
+    "@babel/helper-wrap-function" "^7.1.0"
+    "@babel/template" "^7.1.0"
+    "@babel/traverse" "^7.1.0"
+    "@babel/types" "^7.0.0"
+
+"@babel/helper-simple-access@^7.1.0":
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-simple-access/-/helper-simple-access-7.1.0.tgz#65eeb954c8c245beaa4e859da6188f39d71e585c"
+  integrity sha512-Vk+78hNjRbsiu49zAPALxTb+JUQCz1aolpd8osOF16BGnLtseD21nbHgLPGUwrXEurZgiCOUmvs3ExTu4F5x6w==
+  dependencies:
+    "@babel/template" "^7.1.0"
+    "@babel/types" "^7.0.0"
+
+"@babel/helper-split-export-declaration@^7.4.4":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.4.tgz#ff94894a340be78f53f06af038b205c49d993677"
+  integrity sha512-Ro/XkzLf3JFITkW6b+hNxzZ1n5OQ80NvIUdmHspih1XAhtN3vPTuUFT4eQnela+2MaZ5ulH+iyP513KJrxbN7Q==
+  dependencies:
+    "@babel/types" "^7.4.4"
+
+"@babel/helper-wrap-function@^7.1.0":
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-wrap-function/-/helper-wrap-function-7.2.0.tgz#c4e0012445769e2815b55296ead43a958549f6fa"
+  integrity sha512-o9fP1BZLLSrYlxYEYyl2aS+Flun5gtjTIG8iln+XuEzQTs0PLagAGSXUcqruJwD5fM48jzIEggCKpIfWTcR7pQ==
+  dependencies:
+    "@babel/helper-function-name" "^7.1.0"
+    "@babel/template" "^7.1.0"
+    "@babel/traverse" "^7.1.0"
+    "@babel/types" "^7.2.0"
+
+"@babel/helpers@^7.4.4":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/helpers/-/helpers-7.4.4.tgz#868b0ef59c1dd4e78744562d5ce1b59c89f2f2a5"
+  integrity sha512-igczbR/0SeuPR8RFfC7tGrbdTbFL3QTvH6D+Z6zNxnTe//GyqmtHmDkzrqDmyZ3eSwPqB/LhyKoU5DXsp+Vp2A==
+  dependencies:
+    "@babel/template" "^7.4.4"
+    "@babel/traverse" "^7.4.4"
+    "@babel/types" "^7.4.4"
+
+"@babel/highlight@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.0.0.tgz#f710c38c8d458e6dd9a201afb637fcb781ce99e4"
+  integrity sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==
+  dependencies:
+    chalk "^2.0.0"
+    esutils "^2.0.2"
+    js-tokens "^4.0.0"
+
+"@babel/parser@^7.0.0", "@babel/parser@^7.4.4":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.4.4.tgz#5977129431b8fe33471730d255ce8654ae1250b6"
+  integrity sha512-5pCS4mOsL+ANsFZGdvNLybx4wtqAZJ0MJjMHxvzI3bvIsz6sQvzW8XX92EYIkiPtIvcfG3Aj+Ir5VNyjnZhP7w==
+
+"@babel/plugin-proposal-async-generator-functions@^7.0.0":
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-async-generator-functions/-/plugin-proposal-async-generator-functions-7.2.0.tgz#b289b306669dce4ad20b0252889a15768c9d417e"
+  integrity sha512-+Dfo/SCQqrwx48ptLVGLdE39YtWRuKc/Y9I5Fy0P1DDBB9lsAHpjcEJQt+4IifuSOSTLBKJObJqMvaO1pIE8LQ==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+    "@babel/helper-remap-async-to-generator" "^7.1.0"
+    "@babel/plugin-syntax-async-generators" "^7.2.0"
+
+"@babel/plugin-proposal-object-rest-spread@^7.0.0":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-object-rest-spread/-/plugin-proposal-object-rest-spread-7.4.4.tgz#1ef173fcf24b3e2df92a678f027673b55e7e3005"
+  integrity sha512-dMBG6cSPBbHeEBdFXeQ2QLc5gUpg4Vkaz8octD4aoW/ISO+jBOcsuxYL7bsb5WSu8RLP6boxrBIALEHgoHtO9g==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+    "@babel/plugin-syntax-object-rest-spread" "^7.2.0"
+
+"@babel/plugin-proposal-optional-catch-binding@^7.0.0":
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-optional-catch-binding/-/plugin-proposal-optional-catch-binding-7.2.0.tgz#135d81edb68a081e55e56ec48541ece8065c38f5"
+  integrity sha512-mgYj3jCcxug6KUcX4OBoOJz3CMrwRfQELPQ5560F70YQUBZB7uac9fqaWamKR1iWUzGiK2t0ygzjTScZnVz75g==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+    "@babel/plugin-syntax-optional-catch-binding" "^7.2.0"
+
+"@babel/plugin-syntax-async-generators@^7.2.0":
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-async-generators/-/plugin-syntax-async-generators-7.2.0.tgz#69e1f0db34c6f5a0cf7e2b3323bf159a76c8cb7f"
+  integrity sha512-1ZrIRBv2t0GSlcwVoQ6VgSLpLgiN/FVQUzt9znxo7v2Ov4jJrs8RY8tv0wvDmFN3qIdMKWrmMMW6yZ0G19MfGg==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+
+"@babel/plugin-syntax-object-rest-spread@^7.2.0":
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-object-rest-spread/-/plugin-syntax-object-rest-spread-7.2.0.tgz#3b7a3e733510c57e820b9142a6579ac8b0dfad2e"
+  integrity sha512-t0JKGgqk2We+9may3t0xDdmneaXmyxq0xieYcKHxIsrJO64n1OiMWNUtc5gQK1PA0NpdCRrtZp4z+IUaKugrSA==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+
+"@babel/plugin-syntax-optional-catch-binding@^7.2.0":
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-optional-catch-binding/-/plugin-syntax-optional-catch-binding-7.2.0.tgz#a94013d6eda8908dfe6a477e7f9eda85656ecf5c"
+  integrity sha512-bDe4xKNhb0LI7IvZHiA13kff0KEfaGX/Hv4lMA9+7TEc63hMNvfKo6ZFpXhKuEp+II/q35Gc4NoMeDZyaUbj9w==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+
+"@babel/plugin-transform-async-to-generator@^7.0.0":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-async-to-generator/-/plugin-transform-async-to-generator-7.4.4.tgz#a3f1d01f2f21cadab20b33a82133116f14fb5894"
+  integrity sha512-YiqW2Li8TXmzgbXw+STsSqPBPFnGviiaSp6CYOq55X8GQ2SGVLrXB6pNid8HkqkZAzOH6knbai3snhP7v0fNwA==
+  dependencies:
+    "@babel/helper-module-imports" "^7.0.0"
+    "@babel/helper-plugin-utils" "^7.0.0"
+    "@babel/helper-remap-async-to-generator" "^7.1.0"
+
+"@babel/plugin-transform-dotall-regex@^7.0.0":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-dotall-regex/-/plugin-transform-dotall-regex-7.4.4.tgz#361a148bc951444312c69446d76ed1ea8e4450c3"
+  integrity sha512-P05YEhRc2h53lZDjRPk/OektxCVevFzZs2Gfjd545Wde3k+yFDbXORgl2e0xpbq8mLcKJ7Idss4fAg0zORN/zg==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+    "@babel/helper-regex" "^7.4.4"
+    regexpu-core "^4.5.4"
+
+"@babel/plugin-transform-exponentiation-operator@^7.0.0":
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-exponentiation-operator/-/plugin-transform-exponentiation-operator-7.2.0.tgz#a63868289e5b4007f7054d46491af51435766008"
+  integrity sha512-umh4hR6N7mu4Elq9GG8TOu9M0bakvlsREEC+ialrQN6ABS4oDQ69qJv1VtR3uxlKMCQMCvzk7vr17RHKcjx68A==
+  dependencies:
+    "@babel/helper-builder-binary-assignment-operator-visitor" "^7.1.0"
+    "@babel/helper-plugin-utils" "^7.0.0"
+
+"@babel/plugin-transform-modules-commonjs@^7.0.0":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-modules-commonjs/-/plugin-transform-modules-commonjs-7.4.4.tgz#0bef4713d30f1d78c2e59b3d6db40e60192cac1e"
+  integrity sha512-4sfBOJt58sEo9a2BQXnZq+Q3ZTSAUXyK3E30o36BOGnJ+tvJ6YSxF0PG6kERvbeISgProodWuI9UVG3/FMY6iw==
+  dependencies:
+    "@babel/helper-module-transforms" "^7.4.4"
+    "@babel/helper-plugin-utils" "^7.0.0"
+    "@babel/helper-simple-access" "^7.1.0"
+
+"@babel/template@^7.1.0", "@babel/template@^7.4.4":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.4.4.tgz#f4b88d1225689a08f5bc3a17483545be9e4ed237"
+  integrity sha512-CiGzLN9KgAvgZsnivND7rkA+AeJ9JB0ciPOD4U59GKbQP2iQl+olF1l76kJOupqidozfZ32ghwBEJDhnk9MEcw==
+  dependencies:
+    "@babel/code-frame" "^7.0.0"
+    "@babel/parser" "^7.4.4"
+    "@babel/types" "^7.4.4"
+
+"@babel/traverse@^7.1.0", "@babel/traverse@^7.4.4":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.4.4.tgz#0776f038f6d78361860b6823887d4f3937133fe8"
+  integrity sha512-Gw6qqkw/e6AGzlyj9KnkabJX7VcubqPtkUQVAwkc0wUMldr3A/hezNB3Rc5eIvId95iSGkGIOe5hh1kMKf951A==
+  dependencies:
+    "@babel/code-frame" "^7.0.0"
+    "@babel/generator" "^7.4.4"
+    "@babel/helper-function-name" "^7.1.0"
+    "@babel/helper-split-export-declaration" "^7.4.4"
+    "@babel/parser" "^7.4.4"
+    "@babel/types" "^7.4.4"
+    debug "^4.1.0"
+    globals "^11.1.0"
+    lodash "^4.17.11"
+
+"@babel/types@^7.0.0", "@babel/types@^7.2.0", "@babel/types@^7.4.4":
+  version "7.4.4"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.4.4.tgz#8db9e9a629bb7c29370009b4b779ed93fe57d5f0"
+  integrity sha512-dOllgYdnEFOebhkKCjzSVFqw/PmmB8pH6RGOWkY4GsboQNd47b1fBThBSwlHAq9alF9vc1M3+6oqR47R50L0tQ==
+  dependencies:
+    esutils "^2.0.2"
+    lodash "^4.17.11"
+    to-fast-properties "^2.0.0"
+
+"@concordance/react@^2.0.0":
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/@concordance/react/-/react-2.0.0.tgz#aef913f27474c53731f4fd79cc2f54897de90fde"
+  integrity sha512-huLSkUuM2/P+U0uy2WwlKuixMsTODD8p4JVQBI4VKeopkiN0C7M3N9XYVawb4M+4spN5RrO/eLhk7KoQX6nsfA==
+  dependencies:
+    arrify "^1.0.1"
+
+"@types/events@*":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@types/events/-/events-3.0.0.tgz#2862f3f58a9a7f7c3e78d79f130dd4d71c25c2a7"
+  integrity sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==
+
+"@types/glob@^7.1.1":
+  version "7.1.1"
+  resolved "https://registry.yarnpkg.com/@types/glob/-/glob-7.1.1.tgz#aa59a1c6e3fbc421e07ccd31a944c30eba521575"
+  integrity sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==
+  dependencies:
+    "@types/events" "*"
+    "@types/minimatch" "*"
+    "@types/node" "*"
+
+"@types/minimatch@*":
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-3.0.3.tgz#3dca0e3f33b200fc7d1139c0cd96c1268cadfd9d"
+  integrity sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==
+
+"@types/node@*":
+  version "12.0.2"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.0.2.tgz#3452a24edf9fea138b48fad4a0a028a683da1e40"
+  integrity sha512-5tabW/i+9mhrfEOUcLDu2xBPsHJ+X5Orqy9FKpale3SjDA17j5AEpYq5vfy3oAeAHGcvANRCO3NV3d2D6q3NiA==
+
+abbrev@1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8"
+  integrity sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==
+
+ajv@^6.5.5:
+  version "6.10.0"
+  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.10.0.tgz#90d0d54439da587cd7e843bfb7045f50bd22bdf1"
+  integrity sha512-nffhOpkymDECQyR0mnsUtoCE8RlX38G0rYP+wgLWFyZuUyuuojSSvi/+euOiQBIn63whYwYVIIH1TvE3tu4OEg==
+  dependencies:
+    fast-deep-equal "^2.0.1"
+    fast-json-stable-stringify "^2.0.0"
+    json-schema-traverse "^0.4.1"
+    uri-js "^4.2.2"
+
+ansi-align@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/ansi-align/-/ansi-align-2.0.0.tgz#c36aeccba563b89ceb556f3690f0b1d9e3547f7f"
+  integrity sha1-w2rsy6VjuJzrVW82kPCx2eNUf38=
+  dependencies:
+    string-width "^2.0.0"
+
+ansi-escapes@^3.2.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/ansi-escapes/-/ansi-escapes-3.2.0.tgz#8780b98ff9dbf5638152d1f1fe5c1d7b4442976b"
+  integrity sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==
+
+ansi-regex@^2.0.0:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-2.1.1.tgz#c3b33ab5ee360d86e0e628f0468ae7ef27d654df"
+  integrity sha1-w7M6te42DYbg5ijwRorn7yfWVN8=
+
+ansi-regex@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-3.0.0.tgz#ed0317c322064f79466c02966bddb605ab37d998"
+  integrity sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=
+
+ansi-regex@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-4.1.0.tgz#8b9f8f08cf1acb843756a839ca8c7e3168c51997"
+  integrity sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==
+
+ansi-styles@^3.2.1:
+  version "3.2.1"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
+  integrity sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==
+  dependencies:
+    color-convert "^1.9.0"
+
+anymatch@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/anymatch/-/anymatch-2.0.0.tgz#bcb24b4f37934d9aa7ac17b4adaf89e7c76ef2eb"
+  integrity sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==
+  dependencies:
+    micromatch "^3.1.4"
+    normalize-path "^2.1.1"
+
+aproba@^1.0.3:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/aproba/-/aproba-1.2.0.tgz#6802e6264efd18c790a1b0d517f0f2627bf2c94a"
+  integrity sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==
+
+are-we-there-yet@~1.1.2:
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz#4b35c2944f062a8bfcda66410760350fe9ddfc21"
+  integrity sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==
+  dependencies:
+    delegates "^1.0.0"
+    readable-stream "^2.0.6"
+
+argparse@^1.0.7:
+  version "1.0.10"
+  resolved "https://registry.yarnpkg.com/argparse/-/argparse-1.0.10.tgz#bcd6791ea5ae09725e17e5ad988134cd40b3d911"
+  integrity sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==
+  dependencies:
+    sprintf-js "~1.0.2"
+
+arr-diff@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/arr-diff/-/arr-diff-4.0.0.tgz#d6461074febfec71e7e15235761a329a5dc7c520"
+  integrity sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=
+
+arr-flatten@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/arr-flatten/-/arr-flatten-1.1.0.tgz#36048bbff4e7b47e136644316c99669ea5ae91f1"
+  integrity sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==
+
+arr-union@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/arr-union/-/arr-union-3.1.0.tgz#e39b09aea9def866a8f206e288af63919bae39c4"
+  integrity sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=
+
+array-differ@^2.0.3:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/array-differ/-/array-differ-2.1.0.tgz#4b9c1c3f14b906757082925769e8ab904f4801b1"
+  integrity sha512-KbUpJgx909ZscOc/7CLATBFam7P1Z1QRQInvgT0UztM9Q72aGKCunKASAl7WNW0tnPmPyEMeMhdsfWhfmW037w==
+
+array-find-index@^1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/array-find-index/-/array-find-index-1.0.2.tgz#df010aa1287e164bbda6f9723b0a96a1ec4187a1"
+  integrity sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=
+
+array-union@^1.0.1, array-union@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/array-union/-/array-union-1.0.2.tgz#9a34410e4f4e3da23dea375be5be70f24778ec39"
+  integrity sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=
+  dependencies:
+    array-uniq "^1.0.1"
+
+array-uniq@^1.0.1:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/array-uniq/-/array-uniq-1.0.3.tgz#af6ac877a25cc7f74e058894753858dfdb24fdb6"
+  integrity sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=
+
+array-uniq@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/array-uniq/-/array-uniq-2.1.0.tgz#46603d5e28e79bfd02b046fcc1d77c6820bd8e98"
+  integrity sha512-bdHxtev7FN6+MXI1YFW0Q8mQ8dTJc2S8AMfju+ZR77pbg2yAdVyDlwkaUI7Har0LyOMRFPHrJ9lYdyjZZswdlQ==
+
+array-unique@^0.3.2:
+  version "0.3.2"
+  resolved "https://registry.yarnpkg.com/array-unique/-/array-unique-0.3.2.tgz#a894b75d4bc4f6cd679ef3244a9fd8f46ae2d428"
+  integrity sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=
+
+arrify@^1.0.0, arrify@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/arrify/-/arrify-1.0.1.tgz#898508da2226f380df904728456849c1501a4b0d"
+  integrity sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=
+
+asn1@~0.2.3:
+  version "0.2.4"
+  resolved "https://registry.yarnpkg.com/asn1/-/asn1-0.2.4.tgz#8d2475dfab553bb33e77b54e59e880bb8ce23136"
+  integrity sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==
+  dependencies:
+    safer-buffer "~2.1.0"
+
+assert-plus@1.0.0, assert-plus@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/assert-plus/-/assert-plus-1.0.0.tgz#f12e0f3c5d77b0b1cdd9146942e4e96c1e4dd525"
+  integrity sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=
+
+assign-symbols@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/assign-symbols/-/assign-symbols-1.0.0.tgz#59667f41fadd4f20ccbc2bb96b8d4f7f78ec0367"
+  integrity sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=
+
+async-each@^1.0.1:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/async-each/-/async-each-1.0.3.tgz#b727dbf87d7651602f06f4d4ac387f47d91b0cbf"
+  integrity sha512-z/WhQ5FPySLdvREByI2vZiTWwCnF0moMJ1hK9YQwDTHKh6I7/uSckMetoRGb5UBZPC1z0jlw+n/XCgjeH7y1AQ==
+
+asynckit@^0.4.0:
+  version "0.4.0"
+  resolved "https://registry.yarnpkg.com/asynckit/-/asynckit-0.4.0.tgz#c79ed97f7f34cb8f2ba1bc9790bcc366474b4b79"
+  integrity sha1-x57Zf380y48robyXkLzDZkdLS3k=
+
+atob@^2.1.1:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
+  integrity sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==
+
+ava@^1.4.1:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/ava/-/ava-1.4.1.tgz#4a59289e0c9728e492ec3a5be21d1072636be172"
+  integrity sha512-wKpgOPTL7hJSBWpfbU4SA8rlsTZrph9g9g7qYDV7M6uK1rKeW8oCUJWRwCd8B24S4N0Y5myf6cTEnA66WIk0sA==
+  dependencies:
+    "@ava/babel-preset-stage-4" "^2.0.0"
+    "@ava/babel-preset-transform-test-files" "^5.0.0"
+    "@ava/write-file-atomic" "^2.2.0"
+    "@babel/core" "^7.4.0"
+    "@babel/generator" "^7.4.0"
+    "@babel/plugin-syntax-async-generators" "^7.2.0"
+    "@babel/plugin-syntax-object-rest-spread" "^7.2.0"
+    "@babel/plugin-syntax-optional-catch-binding" "^7.2.0"
+    "@concordance/react" "^2.0.0"
+    ansi-escapes "^3.2.0"
+    ansi-styles "^3.2.1"
+    arr-flatten "^1.1.0"
+    array-union "^1.0.1"
+    array-uniq "^2.0.0"
+    arrify "^1.0.0"
+    bluebird "^3.5.3"
+    chalk "^2.4.2"
+    chokidar "^2.1.5"
+    chunkd "^1.0.0"
+    ci-parallel-vars "^1.0.0"
+    clean-stack "^2.0.0"
+    clean-yaml-object "^0.1.0"
+    cli-cursor "^2.1.0"
+    cli-truncate "^1.1.0"
+    code-excerpt "^2.1.1"
+    common-path-prefix "^1.0.0"
+    concordance "^4.0.0"
+    convert-source-map "^1.6.0"
+    currently-unhandled "^0.4.1"
+    debug "^4.1.1"
+    del "^4.0.0"
+    dot-prop "^4.2.0"
+    emittery "^0.4.1"
+    empower-core "^1.2.0"
+    equal-length "^1.0.0"
+    escape-string-regexp "^1.0.5"
+    esm "^3.2.20"
+    figures "^2.0.0"
+    find-up "^3.0.0"
+    get-port "^4.2.0"
+    globby "^7.1.1"
+    ignore-by-default "^1.0.0"
+    import-local "^2.0.0"
+    indent-string "^3.2.0"
+    is-ci "^2.0.0"
+    is-error "^2.2.1"
+    is-observable "^1.1.0"
+    is-plain-object "^2.0.4"
+    is-promise "^2.1.0"
+    lodash.clone "^4.5.0"
+    lodash.clonedeep "^4.5.0"
+    lodash.clonedeepwith "^4.5.0"
+    lodash.debounce "^4.0.3"
+    lodash.difference "^4.3.0"
+    lodash.flatten "^4.2.0"
+    loud-rejection "^1.2.0"
+    make-dir "^2.1.0"
+    matcher "^1.1.1"
+    md5-hex "^2.0.0"
+    meow "^5.0.0"
+    ms "^2.1.1"
+    multimatch "^3.0.0"
+    observable-to-promise "^0.5.0"
+    ora "^3.2.0"
+    package-hash "^3.0.0"
+    pkg-conf "^3.0.0"
+    plur "^3.0.1"
+    pretty-ms "^4.0.0"
+    require-precompiled "^0.1.0"
+    resolve-cwd "^2.0.0"
+    slash "^2.0.0"
+    source-map-support "^0.5.11"
+    stack-utils "^1.0.2"
+    strip-ansi "^5.2.0"
+    strip-bom-buf "^1.0.0"
+    supertap "^1.0.0"
+    supports-color "^6.1.0"
+    trim-off-newlines "^1.0.1"
+    trim-right "^1.0.1"
+    unique-temp-dir "^1.0.0"
+    update-notifier "^2.5.0"
+
+aws-sign2@~0.7.0:
+  version "0.7.0"
+  resolved "https://registry.yarnpkg.com/aws-sign2/-/aws-sign2-0.7.0.tgz#b46e890934a9591f2d2f6f86d7e6a9f1b3fe76a8"
+  integrity sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=
+
+aws4@^1.8.0:
+  version "1.8.0"
+  resolved "https://registry.yarnpkg.com/aws4/-/aws4-1.8.0.tgz#f0e003d9ca9e7f59c7a508945d7b2ef9a04a542f"
+  integrity sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==
+
+babel-plugin-espower@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/babel-plugin-espower/-/babel-plugin-espower-3.0.1.tgz#180db17126f88e754105b8b5216d21e520a6bd4e"
+  integrity sha512-Ms49U7VIAtQ/TtcqRbD6UBmJBUCSxiC3+zPc+eGqxKUIFO1lTshyEDRUjhoAbd2rWfwYf3cZ62oXozrd8W6J0A==
+  dependencies:
+    "@babel/generator" "^7.0.0"
+    "@babel/parser" "^7.0.0"
+    call-matcher "^1.0.0"
+    core-js "^2.0.0"
+    espower-location-detector "^1.0.0"
+    espurify "^1.6.0"
+    estraverse "^4.1.1"
+
+balanced-match@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
+  integrity sha1-ibTRmasr7kneFk6gK4nORi1xt2c=
+
+base@^0.11.1:
+  version "0.11.2"
+  resolved "https://registry.yarnpkg.com/base/-/base-0.11.2.tgz#7bde5ced145b6d551a90db87f83c558b4eb48a8f"
+  integrity sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==
+  dependencies:
+    cache-base "^1.0.1"
+    class-utils "^0.3.5"
+    component-emitter "^1.2.1"
+    define-property "^1.0.0"
+    isobject "^3.0.1"
+    mixin-deep "^1.2.0"
+    pascalcase "^0.1.1"
+
+bcrypt-pbkdf@^1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz#a4301d389b6a43f9b67ff3ca11a3f6637e360e9e"
+  integrity sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=
+  dependencies:
+    tweetnacl "^0.14.3"
+
+binary-extensions@^1.0.0:
+  version "1.13.1"
+  resolved "https://registry.yarnpkg.com/binary-extensions/-/binary-extensions-1.13.1.tgz#598afe54755b2868a5330d2aff9d4ebb53209b65"
+  integrity sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw==
+
+bluebird@^3.5.3:
+  version "3.5.4"
+  resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.4.tgz#d6cc661595de30d5b3af5fcedd3c0b3ef6ec5714"
+  integrity sha512-FG+nFEZChJrbQ9tIccIfZJBz3J7mLrAhxakAbnrJWn8d7aKOC+LWifa0G+p4ZqKp4y13T7juYvdhq9NzKdsrjw==
+
+boxen@^1.2.1:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/boxen/-/boxen-1.3.0.tgz#55c6c39a8ba58d9c61ad22cd877532deb665a20b"
+  integrity sha512-TNPjfTr432qx7yOjQyaXm3dSR0MH9vXp7eT1BFSl/C51g+EFnOR9hTg1IreahGBmDNCehscshe45f+C1TBZbLw==
+  dependencies:
+    ansi-align "^2.0.0"
+    camelcase "^4.0.0"
+    chalk "^2.0.1"
+    cli-boxes "^1.0.0"
+    string-width "^2.0.0"
+    term-size "^1.2.0"
+    widest-line "^2.0.0"
+
+brace-expansion@^1.1.7:
+  version "1.1.11"
+  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
+  integrity sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==
+  dependencies:
+    balanced-match "^1.0.0"
+    concat-map "0.0.1"
+
+braces@^2.3.1, braces@^2.3.2:
+  version "2.3.2"
+  resolved "https://registry.yarnpkg.com/braces/-/braces-2.3.2.tgz#5979fd3f14cd531565e5fa2df1abfff1dfaee729"
+  integrity sha512-aNdbnj9P8PjdXU4ybaWLK2IF3jc/EoDYbC7AazW6to3TRsfXxscC9UXOB5iDiEQrkyIbWp2SLQda4+QAa7nc3w==
+  dependencies:
+    arr-flatten "^1.1.0"
+    array-unique "^0.3.2"
+    extend-shallow "^2.0.1"
+    fill-range "^4.0.0"
+    isobject "^3.0.1"
+    repeat-element "^1.1.2"
+    snapdragon "^0.8.1"
+    snapdragon-node "^2.0.1"
+    split-string "^3.0.2"
+    to-regex "^3.0.1"
+
+buffer-from@^1.0.0:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.1.tgz#32713bc028f75c02fdb710d7c7bcec1f2c6070ef"
+  integrity sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==
+
+cache-base@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/cache-base/-/cache-base-1.0.1.tgz#0a7f46416831c8b662ee36fe4e7c59d76f666ab2"
+  integrity sha512-AKcdTnFSWATd5/GCPRxr2ChwIJ85CeyrEyjRHlKxQ56d4XJMGym0uAiKn0xbLOGOl3+yRpOTi484dVCEc5AUzQ==
+  dependencies:
+    collection-visit "^1.0.0"
+    component-emitter "^1.2.1"
+    get-value "^2.0.6"
+    has-value "^1.0.0"
+    isobject "^3.0.1"
+    set-value "^2.0.0"
+    to-object-path "^0.3.0"
+    union-value "^1.0.0"
+    unset-value "^1.0.0"
+
+call-matcher@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/call-matcher/-/call-matcher-1.1.0.tgz#23b2c1bc7a8394c8be28609d77ddbd5786680432"
+  integrity sha512-IoQLeNwwf9KTNbtSA7aEBb1yfDbdnzwjCetjkC8io5oGeOmK2CBNdg0xr+tadRYKO0p7uQyZzvon0kXlZbvGrw==
+  dependencies:
+    core-js "^2.0.0"
+    deep-equal "^1.0.0"
+    espurify "^1.6.0"
+    estraverse "^4.0.0"
+
+call-signature@0.0.2:
+  version "0.0.2"
+  resolved "https://registry.yarnpkg.com/call-signature/-/call-signature-0.0.2.tgz#a84abc825a55ef4cb2b028bd74e205a65b9a4996"
+  integrity sha1-qEq8glpV70yysCi9dOIFpluaSZY=
+
+camelcase-keys@^4.0.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/camelcase-keys/-/camelcase-keys-4.2.0.tgz#a2aa5fb1af688758259c32c141426d78923b9b77"
+  integrity sha1-oqpfsa9oh1glnDLBQUJteJI7m3c=
+  dependencies:
+    camelcase "^4.1.0"
+    map-obj "^2.0.0"
+    quick-lru "^1.0.0"
+
+camelcase@^4.0.0, camelcase@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-4.1.0.tgz#d545635be1e33c542649c69173e5de6acfae34dd"
+  integrity sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=
+
+capture-stack-trace@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/capture-stack-trace/-/capture-stack-trace-1.0.1.tgz#a6c0bbe1f38f3aa0b92238ecb6ff42c344d4135d"
+  integrity sha512-mYQLZnx5Qt1JgB1WEiMCf2647plpGeQ2NMR/5L0HNZzGQo4fuSPnK+wjfPnKZV0aiJDgzmWqqkV/g7JD+DW0qw==
+
+caseless@~0.12.0:
+  version "0.12.0"
+  resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
+  integrity sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=
+
+chalk@^2.0.0, chalk@^2.0.1, chalk@^2.4.2:
+  version "2.4.2"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.2.tgz#cd42541677a54333cf541a49108c1432b44c9424"
+  integrity sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==
+  dependencies:
+    ansi-styles "^3.2.1"
+    escape-string-regexp "^1.0.5"
+    supports-color "^5.3.0"
+
+chokidar@^2.1.5:
+  version "2.1.6"
+  resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-2.1.6.tgz#b6cad653a929e244ce8a834244164d241fa954c5"
+  integrity sha512-V2jUo67OKkc6ySiRpJrjlpJKl9kDuG+Xb8VgsGzb+aEouhgS1D0weyPU4lEzdAcsCAvrih2J2BqyXqHWvVLw5g==
+  dependencies:
+    anymatch "^2.0.0"
+    async-each "^1.0.1"
+    braces "^2.3.2"
+    glob-parent "^3.1.0"
+    inherits "^2.0.3"
+    is-binary-path "^1.0.0"
+    is-glob "^4.0.0"
+    normalize-path "^3.0.0"
+    path-is-absolute "^1.0.0"
+    readdirp "^2.2.1"
+    upath "^1.1.1"
+  optionalDependencies:
+    fsevents "^1.2.7"
+
+chownr@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/chownr/-/chownr-1.1.1.tgz#54726b8b8fff4df053c42187e801fb4412df1494"
+  integrity sha512-j38EvO5+LHX84jlo6h4UzmOwi0UgW61WRyPtJz4qaadK5eY3BTS5TY/S1Stc3Uk2lIM6TPevAlULiEJwie860g==
+
+chunkd@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/chunkd/-/chunkd-1.0.0.tgz#4ead4a3704bcce510c4bb4d4a8be30c557836dd1"
+  integrity sha512-xx3Pb5VF9QaqCotolyZ1ywFBgyuJmu6+9dLiqBxgelEse9Xsr3yUlpoX3O4Oh11M00GT2kYMsRByTKIMJW2Lkg==
+
+ci-info@^1.5.0:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-1.6.0.tgz#2ca20dbb9ceb32d4524a683303313f0304b1e497"
+  integrity sha512-vsGdkwSCDpWmP80ncATX7iea5DWQemg1UgCW5J8tqjU3lYw4FBYuj89J0CTVomA7BEfvSZd84GmHko+MxFQU2A==
+
+ci-info@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-2.0.0.tgz#67a9e964be31a51e15e5010d58e6f12834002f46"
+  integrity sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ==
+
+ci-parallel-vars@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/ci-parallel-vars/-/ci-parallel-vars-1.0.0.tgz#af97729ed1c7381911ca37bcea263d62638701b3"
+  integrity sha512-u6dx20FBXm+apMi+5x7UVm6EH7BL1gc4XrcnQewjcB7HWRcor/V5qWc3RG2HwpgDJ26gIi2DSEu3B7sXynAw/g==
+
+class-utils@^0.3.5:
+  version "0.3.6"
+  resolved "https://registry.yarnpkg.com/class-utils/-/class-utils-0.3.6.tgz#f93369ae8b9a7ce02fd41faad0ca83033190c463"
+  integrity sha512-qOhPa/Fj7s6TY8H8esGu5QNpMMQxz79h+urzrNYN6mn+9BnxlDGf5QZ+XeCDsxSjPqsSR56XOZOJmpeurnLMeg==
+  dependencies:
+    arr-union "^3.1.0"
+    define-property "^0.2.5"
+    isobject "^3.0.0"
+    static-extend "^0.1.1"
+
+clean-stack@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/clean-stack/-/clean-stack-2.1.0.tgz#9e7fec7f3f8340a2ab4f127c80273085e8fbbdd0"
+  integrity sha512-uQWrpRm+iZZUCAp7ZZJQbd4Za9I3AjR/3YTjmcnAtkauaIm/T5CT6U8zVI6e60T6OANqBFAzuR9/HB3NzuZCRA==
+
+clean-yaml-object@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/clean-yaml-object/-/clean-yaml-object-0.1.0.tgz#63fb110dc2ce1a84dc21f6d9334876d010ae8b68"
+  integrity sha1-Y/sRDcLOGoTcIfbZM0h20BCui2g=
+
+cli-boxes@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/cli-boxes/-/cli-boxes-1.0.0.tgz#4fa917c3e59c94a004cd61f8ee509da651687143"
+  integrity sha1-T6kXw+WclKAEzWH47lCdplFocUM=
+
+cli-cursor@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/cli-cursor/-/cli-cursor-2.1.0.tgz#b35dac376479facc3e94747d41d0d0f5238ffcb5"
+  integrity sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=
+  dependencies:
+    restore-cursor "^2.0.0"
+
+cli-spinners@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/cli-spinners/-/cli-spinners-2.1.0.tgz#22c34b4d51f573240885b201efda4e4ec9fff3c7"
+  integrity sha512-8B00fJOEh1HPrx4fo5eW16XmE1PcL1tGpGrxy63CXGP9nHdPBN63X75hA1zhvQuhVztJWLqV58Roj2qlNM7cAA==
+
+cli-truncate@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/cli-truncate/-/cli-truncate-1.1.0.tgz#2b2dfd83c53cfd3572b87fc4d430a808afb04086"
+  integrity sha512-bAtZo0u82gCfaAGfSNxUdTI9mNyza7D8w4CVCcaOsy7sgwDzvx6ekr6cuWJqY3UGzgnQ1+4wgENup5eIhgxEYA==
+  dependencies:
+    slice-ansi "^1.0.0"
+    string-width "^2.0.0"
+
+clone@^1.0.2:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/clone/-/clone-1.0.4.tgz#da309cc263df15994c688ca902179ca3c7cd7c7e"
+  integrity sha1-2jCcwmPfFZlMaIypAheco8fNfH4=
+
+code-excerpt@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/code-excerpt/-/code-excerpt-2.1.1.tgz#5fe3057bfbb71a5f300f659ef2cc0a47651ba77c"
+  integrity sha512-tJLhH3EpFm/1x7heIW0hemXJTUU5EWl2V0EIX558jp05Mt1U6DVryCgkp3l37cxqs+DNbNgxG43SkwJXpQ14Jw==
+  dependencies:
+    convert-to-spaces "^1.0.1"
+
+code-point-at@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/code-point-at/-/code-point-at-1.1.0.tgz#0d070b4d043a5bea33a2f1a40e2edb3d9a4ccf77"
+  integrity sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=
+
+collection-visit@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/collection-visit/-/collection-visit-1.0.0.tgz#4bc0373c164bc3291b4d368c829cf1a80a59dca0"
+  integrity sha1-S8A3PBZLwykbTTaMgpzxqApZ3KA=
+  dependencies:
+    map-visit "^1.0.0"
+    object-visit "^1.0.0"
+
+color-convert@^1.9.0:
+  version "1.9.3"
+  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.3.tgz#bb71850690e1f136567de629d2d5471deda4c1e8"
+  integrity sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==
+  dependencies:
+    color-name "1.1.3"
+
+color-name@1.1.3:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
+  integrity sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=
+
+combined-stream@^1.0.6, combined-stream@~1.0.6:
+  version "1.0.8"
+  resolved "https://registry.yarnpkg.com/combined-stream/-/combined-stream-1.0.8.tgz#c3d45a8b34fd730631a110a8a2520682b31d5a7f"
+  integrity sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==
+  dependencies:
+    delayed-stream "~1.0.0"
+
+common-path-prefix@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/common-path-prefix/-/common-path-prefix-1.0.0.tgz#cd52f6f0712e0baab97d6f9732874f22f47752c0"
+  integrity sha1-zVL28HEuC6q5fW+XModPIvR3UsA=
+
+component-emitter@^1.2.1:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/component-emitter/-/component-emitter-1.3.0.tgz#16e4070fba8ae29b679f2215853ee181ab2eabc0"
+  integrity sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg==
+
+concat-map@0.0.1:
+  version "0.0.1"
+  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
+  integrity sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=
+
+concordance@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/concordance/-/concordance-4.0.0.tgz#5932fdee397d129bdbc3a1885fbe69839b1b7e15"
+  integrity sha512-l0RFuB8RLfCS0Pt2Id39/oCPykE01pyxgAFypWTlaGRgvLkZrtczZ8atEHpTeEIW+zYWXTBuA9cCSeEOScxReQ==
+  dependencies:
+    date-time "^2.1.0"
+    esutils "^2.0.2"
+    fast-diff "^1.1.2"
+    js-string-escape "^1.0.1"
+    lodash.clonedeep "^4.5.0"
+    lodash.flattendeep "^4.4.0"
+    lodash.islength "^4.0.1"
+    lodash.merge "^4.6.1"
+    md5-hex "^2.0.0"
+    semver "^5.5.1"
+    well-known-symbols "^2.0.0"
+
+configstore@^3.0.0:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/configstore/-/configstore-3.1.2.tgz#c6f25defaeef26df12dd33414b001fe81a543f8f"
+  integrity sha512-vtv5HtGjcYUgFrXc6Kx747B83MRRVS5R1VTEQoXvuP+kMI+if6uywV0nDGoiydJRy4yk7h9od5Og0kxx4zUXmw==
+  dependencies:
+    dot-prop "^4.1.0"
+    graceful-fs "^4.1.2"
+    make-dir "^1.0.0"
+    unique-string "^1.0.0"
+    write-file-atomic "^2.0.0"
+    xdg-basedir "^3.0.0"
+
+console-control-strings@^1.0.0, console-control-strings@~1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/console-control-strings/-/console-control-strings-1.1.0.tgz#3d7cf4464db6446ea644bf4b39507f9851008e8e"
+  integrity sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=
+
+convert-source-map@^1.1.0, convert-source-map@^1.6.0:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.6.0.tgz#51b537a8c43e0f04dec1993bffcdd504e758ac20"
+  integrity sha512-eFu7XigvxdZ1ETfbgPBohgyQ/Z++C0eEhTor0qRwBw9unw+L0/6V8wkSuGgzdThkiS5lSpdptOQPD8Ak40a+7A==
+  dependencies:
+    safe-buffer "~5.1.1"
+
+convert-to-spaces@^1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/convert-to-spaces/-/convert-to-spaces-1.0.2.tgz#7e3e48bbe6d997b1417ddca2868204b4d3d85715"
+  integrity sha1-fj5Iu+bZl7FBfdyihoIEtNPYVxU=
+
+copy-descriptor@^0.1.0:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/copy-descriptor/-/copy-descriptor-0.1.1.tgz#676f6eb3c39997c2ee1ac3a924fd6124748f578d"
+  integrity sha1-Z29us8OZl8LuGsOpJP1hJHSPV40=
+
+core-js@^2.0.0:
+  version "2.6.5"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.5.tgz#44bc8d249e7fb2ff5d00e0341a7ffb94fbf67895"
+  integrity sha512-klh/kDpwX8hryYL14M9w/xei6vrv6sE8gTHDG7/T/+SEovB/G4ejwcfE/CBzO6Edsu+OETZMZ3wcX/EjUkrl5A==
+
+core-util-is@1.0.2, core-util-is@~1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
+  integrity sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=
+
+create-error-class@^3.0.0:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/create-error-class/-/create-error-class-3.0.2.tgz#06be7abef947a3f14a30fd610671d401bca8b7b6"
+  integrity sha1-Br56vvlHo/FKMP1hBnHUAbyot7Y=
+  dependencies:
+    capture-stack-trace "^1.0.0"
+
+cross-spawn@^5.0.1:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-5.1.0.tgz#e8bd0efee58fcff6f8f94510a0a554bbfa235449"
+  integrity sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=
+  dependencies:
+    lru-cache "^4.0.1"
+    shebang-command "^1.2.0"
+    which "^1.2.9"
+
+crypto-random-string@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/crypto-random-string/-/crypto-random-string-1.0.0.tgz#a230f64f568310e1498009940790ec99545bca7e"
+  integrity sha1-ojD2T1aDEOFJgAmUB5DsmVRbyn4=
+
+currently-unhandled@^0.4.1:
+  version "0.4.1"
+  resolved "https://registry.yarnpkg.com/currently-unhandled/-/currently-unhandled-0.4.1.tgz#988df33feab191ef799a61369dd76c17adf957ea"
+  integrity sha1-mI3zP+qxke95mmE2nddsF635V+o=
+  dependencies:
+    array-find-index "^1.0.1"
+
+dashdash@^1.12.0:
+  version "1.14.1"
+  resolved "https://registry.yarnpkg.com/dashdash/-/dashdash-1.14.1.tgz#853cfa0f7cbe2fed5de20326b8dd581035f6e2f0"
+  integrity sha1-hTz6D3y+L+1d4gMmuN1YEDX24vA=
+  dependencies:
+    assert-plus "^1.0.0"
+
+date-time@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/date-time/-/date-time-2.1.0.tgz#0286d1b4c769633b3ca13e1e62558d2dbdc2eba2"
+  integrity sha512-/9+C44X7lot0IeiyfgJmETtRMhBidBYM2QFFIkGa0U1k+hSyY87Nw7PY3eDqpvCBm7I3WCSfPeZskW/YYq6m4g==
+  dependencies:
+    time-zone "^1.0.0"
+
+debug@^2.2.0, debug@^2.3.3:
+  version "2.6.9"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
+  integrity sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==
+  dependencies:
+    ms "2.0.0"
+
+debug@^3.2.6:
+  version "3.2.6"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.6.tgz#e83d17de16d8a7efb7717edbe5fb10135eee629b"
+  integrity sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==
+  dependencies:
+    ms "^2.1.1"
+
+debug@^4.1.0, debug@^4.1.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-4.1.1.tgz#3b72260255109c6b589cee050f1d516139664791"
+  integrity sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==
+  dependencies:
+    ms "^2.1.1"
+
+decamelize-keys@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/decamelize-keys/-/decamelize-keys-1.1.0.tgz#d171a87933252807eb3cb61dc1c1445d078df2d9"
+  integrity sha1-0XGoeTMlKAfrPLYdwcFEXQeN8tk=
+  dependencies:
+    decamelize "^1.1.0"
+    map-obj "^1.0.0"
+
+decamelize@^1.1.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
+  integrity sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=
+
+decode-uri-component@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/decode-uri-component/-/decode-uri-component-0.2.0.tgz#eb3913333458775cb84cd1a1fae062106bb87545"
+  integrity sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=
+
+deep-equal@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/deep-equal/-/deep-equal-1.0.1.tgz#f5d260292b660e084eff4cdbc9f08ad3247448b5"
+  integrity sha1-9dJgKStmDghO/0zbyfCK0yR0SLU=
+
+deep-extend@^0.6.0:
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/deep-extend/-/deep-extend-0.6.0.tgz#c4fa7c95404a17a9c3e8ca7e1537312b736330ac"
+  integrity sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==
+
+defaults@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/defaults/-/defaults-1.0.3.tgz#c656051e9817d9ff08ed881477f3fe4019f3ef7d"
+  integrity sha1-xlYFHpgX2f8I7YgUd/P+QBnz730=
+  dependencies:
+    clone "^1.0.2"
+
+define-property@^0.2.5:
+  version "0.2.5"
+  resolved "https://registry.yarnpkg.com/define-property/-/define-property-0.2.5.tgz#c35b1ef918ec3c990f9a5bc57be04aacec5c8116"
+  integrity sha1-w1se+RjsPJkPmlvFe+BKrOxcgRY=
+  dependencies:
+    is-descriptor "^0.1.0"
+
+define-property@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/define-property/-/define-property-1.0.0.tgz#769ebaaf3f4a63aad3af9e8d304c9bbe79bfb0e6"
+  integrity sha1-dp66rz9KY6rTr56NMEybvnm/sOY=
+  dependencies:
+    is-descriptor "^1.0.0"
+
+define-property@^2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/define-property/-/define-property-2.0.2.tgz#d459689e8d654ba77e02a817f8710d702cb16e9d"
+  integrity sha512-jwK2UV4cnPpbcG7+VRARKTZPUWowwXA8bzH5NP6ud0oeAxyYPuGZUAC7hMugpCdz4BeSZl2Dl9k66CHJ/46ZYQ==
+  dependencies:
+    is-descriptor "^1.0.2"
+    isobject "^3.0.1"
+
+del@^4.0.0:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/del/-/del-4.1.1.tgz#9e8f117222ea44a31ff3a156c049b99052a9f0b4"
+  integrity sha512-QwGuEUouP2kVwQenAsOof5Fv8K9t3D8Ca8NxcXKrIpEHjTXK5J2nXLdP+ALI1cgv8wj7KuwBhTwBkOZSJKM5XQ==
+  dependencies:
+    "@types/glob" "^7.1.1"
+    globby "^6.1.0"
+    is-path-cwd "^2.0.0"
+    is-path-in-cwd "^2.0.0"
+    p-map "^2.0.0"
+    pify "^4.0.1"
+    rimraf "^2.6.3"
+
+delayed-stream@~1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/delayed-stream/-/delayed-stream-1.0.0.tgz#df3ae199acadfb7d440aaae0b29e2272b24ec619"
+  integrity sha1-3zrhmayt+31ECqrgsp4icrJOxhk=
+
+delegates@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/delegates/-/delegates-1.0.0.tgz#84c6e159b81904fdca59a0ef44cd870d31250f9a"
+  integrity sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=
+
+detect-libc@^1.0.2:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/detect-libc/-/detect-libc-1.0.3.tgz#fa137c4bd698edf55cd5cd02ac559f91a4c4ba9b"
+  integrity sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=
+
+dir-glob@^2.0.0:
+  version "2.2.2"
+  resolved "https://registry.yarnpkg.com/dir-glob/-/dir-glob-2.2.2.tgz#fa09f0694153c8918b18ba0deafae94769fc50c4"
+  integrity sha512-f9LBi5QWzIW3I6e//uxZoLBlUt9kcp66qo0sSCxL6YZKc75R1c4MFCoe/LaZiBGmgujvQdxc5Bn3QhfyvK5Hsw==
+  dependencies:
+    path-type "^3.0.0"
+
+dot-prop@^4.1.0, dot-prop@^4.2.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/dot-prop/-/dot-prop-4.2.0.tgz#1f19e0c2e1aa0e32797c49799f2837ac6af69c57"
+  integrity sha512-tUMXrxlExSW6U2EXiiKGSBVdYgtV8qlHL+C10TsW4PURY/ic+eaysnSkwB4kA/mBlCyy/IKDJ+Lc3wbWeaXtuQ==
+  dependencies:
+    is-obj "^1.0.0"
+
+duplexer3@^0.1.4:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/duplexer3/-/duplexer3-0.1.4.tgz#ee01dd1cac0ed3cbc7fdbea37dc0a8f1ce002ce2"
+  integrity sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI=
+
+ecc-jsbn@~0.1.1:
+  version "0.1.2"
+  resolved "https://registry.yarnpkg.com/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz#3a83a904e54353287874c564b7549386849a98c9"
+  integrity sha1-OoOpBOVDUyh4dMVkt1SThoSamMk=
+  dependencies:
+    jsbn "~0.1.0"
+    safer-buffer "^2.1.0"
+
+emittery@^0.4.1:
+  version "0.4.1"
+  resolved "https://registry.yarnpkg.com/emittery/-/emittery-0.4.1.tgz#abe9d3297389ba424ac87e53d1c701962ce7433d"
+  integrity sha512-r4eRSeStEGf6M5SKdrQhhLK5bOwOBxQhIE3YSTnZE3GpKiLfnnhE+tPtrJE79+eDJgm39BM6LSoI8SCx4HbwlQ==
+
+empower-core@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/empower-core/-/empower-core-1.2.0.tgz#ce3fb2484d5187fa29c23fba8344b0b2fdf5601c"
+  integrity sha512-g6+K6Geyc1o6FdXs9HwrXleCFan7d66G5xSCfSF7x1mJDCes6t0om9lFQG3zOrzh3Bkb/45N0cZ5Gqsf7YrzGQ==
+  dependencies:
+    call-signature "0.0.2"
+    core-js "^2.0.0"
+
+equal-length@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/equal-length/-/equal-length-1.0.1.tgz#21ca112d48ab24b4e1e7ffc0e5339d31fdfc274c"
+  integrity sha1-IcoRLUirJLTh5//A5TOdMf38J0w=
+
+error-ex@^1.3.1:
+  version "1.3.2"
+  resolved "https://registry.yarnpkg.com/error-ex/-/error-ex-1.3.2.tgz#b4ac40648107fdcdcfae242f428bea8a14d4f1bf"
+  integrity sha512-7dFHNmqeFSEt2ZBsCriorKnn3Z2pj+fd9kmI6QoWw4//DL+icEBfc0U7qJCisqrTsKTjw4fNFy2pW9OqStD84g==
+  dependencies:
+    is-arrayish "^0.2.1"
+
+es6-error@^4.0.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/es6-error/-/es6-error-4.1.1.tgz#9e3af407459deed47e9a91f9b885a84eb05c561d"
+  integrity sha512-Um/+FxMr9CISWh0bi5Zv0iOD+4cFh5qLeks1qhAopKVAJw3drgKbKySikp7wGhDL0HPeaja0P5ULZrxLkniUVg==
+
+escape-string-regexp@^1.0.4, escape-string-regexp@^1.0.5:
+  version "1.0.5"
+  resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
+  integrity sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=
+
+esm@^3.2.20:
+  version "3.2.25"
+  resolved "https://registry.yarnpkg.com/esm/-/esm-3.2.25.tgz#342c18c29d56157688ba5ce31f8431fbb795cc10"
+  integrity sha512-U1suiZ2oDVWv4zPO56S0NcR5QriEahGtdN2OR6FiOG4WJvcjBVFB0qI4+eKoWFH483PKGuLuu6V8Z4T5g63UVA==
+
+espower-location-detector@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/espower-location-detector/-/espower-location-detector-1.0.0.tgz#a17b7ecc59d30e179e2bef73fb4137704cb331b5"
+  integrity sha1-oXt+zFnTDheeK+9z+0E3cEyzMbU=
+  dependencies:
+    is-url "^1.2.1"
+    path-is-absolute "^1.0.0"
+    source-map "^0.5.0"
+    xtend "^4.0.0"
+
+esprima@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/esprima/-/esprima-4.0.1.tgz#13b04cdb3e6c5d19df91ab6987a8695619b0aa71"
+  integrity sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==
+
+espurify@^1.6.0:
+  version "1.8.1"
+  resolved "https://registry.yarnpkg.com/espurify/-/espurify-1.8.1.tgz#5746c6c1ab42d302de10bd1d5bf7f0e8c0515056"
+  integrity sha512-ZDko6eY/o+D/gHCWyHTU85mKDgYcS4FJj7S+YD6WIInm7GQ6AnOjmcL4+buFV/JOztVLELi/7MmuGU5NHta0Mg==
+  dependencies:
+    core-js "^2.0.0"
+
+estraverse@^4.0.0, estraverse@^4.1.1:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/estraverse/-/estraverse-4.2.0.tgz#0dee3fed31fcd469618ce7342099fc1afa0bdb13"
+  integrity sha1-De4/7TH81GlhjOc0IJn8GvoL2xM=
+
+esutils@^2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.2.tgz#0abf4f1caa5bcb1f7a9d8acc6dea4faaa04bac9b"
+  integrity sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs=
+
+execa@^0.7.0:
+  version "0.7.0"
+  resolved "https://registry.yarnpkg.com/execa/-/execa-0.7.0.tgz#944becd34cc41ee32a63a9faf27ad5a65fc59777"
+  integrity sha1-lEvs00zEHuMqY6n68nrVpl/Fl3c=
+  dependencies:
+    cross-spawn "^5.0.1"
+    get-stream "^3.0.0"
+    is-stream "^1.1.0"
+    npm-run-path "^2.0.0"
+    p-finally "^1.0.0"
+    signal-exit "^3.0.0"
+    strip-eof "^1.0.0"
+
+expand-brackets@^2.1.4:
+  version "2.1.4"
+  resolved "https://registry.yarnpkg.com/expand-brackets/-/expand-brackets-2.1.4.tgz#b77735e315ce30f6b6eff0f83b04151a22449622"
+  integrity sha1-t3c14xXOMPa27/D4OwQVGiJEliI=
+  dependencies:
+    debug "^2.3.3"
+    define-property "^0.2.5"
+    extend-shallow "^2.0.1"
+    posix-character-classes "^0.1.0"
+    regex-not "^1.0.0"
+    snapdragon "^0.8.1"
+    to-regex "^3.0.1"
+
+extend-shallow@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/extend-shallow/-/extend-shallow-2.0.1.tgz#51af7d614ad9a9f610ea1bafbb989d6b1c56890f"
+  integrity sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=
+  dependencies:
+    is-extendable "^0.1.0"
+
+extend-shallow@^3.0.0, extend-shallow@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/extend-shallow/-/extend-shallow-3.0.2.tgz#26a71aaf073b39fb2127172746131c2704028db8"
+  integrity sha1-Jqcarwc7OfshJxcnRhMcJwQCjbg=
+  dependencies:
+    assign-symbols "^1.0.0"
+    is-extendable "^1.0.1"
+
+extend@~3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.2.tgz#f8b1136b4071fbd8eb140aff858b1019ec2915fa"
+  integrity sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==
+
+extglob@^2.0.4:
+  version "2.0.4"
+  resolved "https://registry.yarnpkg.com/extglob/-/extglob-2.0.4.tgz#ad00fe4dc612a9232e8718711dc5cb5ab0285543"
+  integrity sha512-Nmb6QXkELsuBr24CJSkilo6UHHgbekK5UiZgfE6UHD3Eb27YC6oD+bhcT+tJ6cl8dmsgdQxnWlcry8ksBIBLpw==
+  dependencies:
+    array-unique "^0.3.2"
+    define-property "^1.0.0"
+    expand-brackets "^2.1.4"
+    extend-shallow "^2.0.1"
+    fragment-cache "^0.2.1"
+    regex-not "^1.0.0"
+    snapdragon "^0.8.1"
+    to-regex "^3.0.1"
+
+extsprintf@1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/extsprintf/-/extsprintf-1.3.0.tgz#96918440e3041a7a414f8c52e3c574eb3c3e1e05"
+  integrity sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=
+
+extsprintf@^1.2.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/extsprintf/-/extsprintf-1.4.0.tgz#e2689f8f356fad62cca65a3a91c5df5f9551692f"
+  integrity sha1-4mifjzVvrWLMplo6kcXfX5VRaS8=
+
+fast-deep-equal@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz#7b05218ddf9667bf7f370bf7fdb2cb15fdd0aa49"
+  integrity sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk=
+
+fast-diff@^1.1.2:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/fast-diff/-/fast-diff-1.2.0.tgz#73ee11982d86caaf7959828d519cfe927fac5f03"
+  integrity sha512-xJuoT5+L99XlZ8twedaRf6Ax2TgQVxvgZOYoPKqZufmJib0tL2tegPBOZb1pVNgIhlqDlA0eO0c3wBvQcmzx4w==
+
+fast-json-stable-stringify@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/fast-json-stable-stringify/-/fast-json-stable-stringify-2.0.0.tgz#d5142c0caee6b1189f87d3a76111064f86c8bbf2"
+  integrity sha1-1RQsDK7msRifh9OnYREGT4bIu/I=
+
+figures@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/figures/-/figures-2.0.0.tgz#3ab1a2d2a62c8bfb431a0c94cb797a2fce27c962"
+  integrity sha1-OrGi0qYsi/tDGgyUy3l6L84nyWI=
+  dependencies:
+    escape-string-regexp "^1.0.5"
+
+fill-range@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/fill-range/-/fill-range-4.0.0.tgz#d544811d428f98eb06a63dc402d2403c328c38f7"
+  integrity sha1-1USBHUKPmOsGpj3EAtJAPDKMOPc=
+  dependencies:
+    extend-shallow "^2.0.1"
+    is-number "^3.0.0"
+    repeat-string "^1.6.1"
+    to-regex-range "^2.1.0"
+
+find-up@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/find-up/-/find-up-2.1.0.tgz#45d1b7e506c717ddd482775a2b77920a3c0c57a7"
+  integrity sha1-RdG35QbHF93UgndaK3eSCjwMV6c=
+  dependencies:
+    locate-path "^2.0.0"
+
+find-up@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/find-up/-/find-up-3.0.0.tgz#49169f1d7993430646da61ecc5ae355c21c97b73"
+  integrity sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==
+  dependencies:
+    locate-path "^3.0.0"
+
+for-in@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/for-in/-/for-in-1.0.2.tgz#81068d295a8142ec0ac726c6e2200c30fb6d5e80"
+  integrity sha1-gQaNKVqBQuwKxybG4iAMMPttXoA=
+
+forever-agent@~0.6.1:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/forever-agent/-/forever-agent-0.6.1.tgz#fbc71f0c41adeb37f96c577ad1ed42d8fdacca91"
+  integrity sha1-+8cfDEGt6zf5bFd60e1C2P2sypE=
+
+form-data@~2.3.2:
+  version "2.3.3"
+  resolved "https://registry.yarnpkg.com/form-data/-/form-data-2.3.3.tgz#dcce52c05f644f298c6a7ab936bd724ceffbf3a6"
+  integrity sha512-1lLKB2Mu3aGP1Q/2eCOx0fNbRMe7XdwktwOruhfqqd0rIJWwN4Dh+E3hrPSlDCXnSR7UtZ1N38rVXm+6+MEhJQ==
+  dependencies:
+    asynckit "^0.4.0"
+    combined-stream "^1.0.6"
+    mime-types "^2.1.12"
+
+fragment-cache@^0.2.1:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/fragment-cache/-/fragment-cache-0.2.1.tgz#4290fad27f13e89be7f33799c6bc5a0abfff0d19"
+  integrity sha1-QpD60n8T6Jvn8zeZxrxaCr//DRk=
+  dependencies:
+    map-cache "^0.2.2"
+
+fs-minipass@^1.2.5:
+  version "1.2.6"
+  resolved "https://registry.yarnpkg.com/fs-minipass/-/fs-minipass-1.2.6.tgz#2c5cc30ded81282bfe8a0d7c7c1853ddeb102c07"
+  integrity sha512-crhvyXcMejjv3Z5d2Fa9sf5xLYVCF5O1c71QxbVnbLsmYMBEvDAftewesN/HhY03YRoA7zOMxjNGrF5svGaaeQ==
+  dependencies:
+    minipass "^2.2.1"
+
+fs.realpath@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
+  integrity sha1-FQStJSMVjKpA20onh8sBQRmU6k8=
+
+fsevents@^1.2.7:
+  version "1.2.9"
+  resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-1.2.9.tgz#3f5ed66583ccd6f400b5a00db6f7e861363e388f"
+  integrity sha512-oeyj2H3EjjonWcFjD5NvZNE9Rqe4UW+nQBU2HNeKw0koVLEFIhtyETyAakeAM3de7Z/SW5kcA+fZUait9EApnw==
+  dependencies:
+    nan "^2.12.1"
+    node-pre-gyp "^0.12.0"
+
+gauge@~2.7.3:
+  version "2.7.4"
+  resolved "https://registry.yarnpkg.com/gauge/-/gauge-2.7.4.tgz#2c03405c7538c39d7eb37b317022e325fb018bf7"
+  integrity sha1-LANAXHU4w51+s3sxcCLjJfsBi/c=
+  dependencies:
+    aproba "^1.0.3"
+    console-control-strings "^1.0.0"
+    has-unicode "^2.0.0"
+    object-assign "^4.1.0"
+    signal-exit "^3.0.0"
+    string-width "^1.0.1"
+    strip-ansi "^3.0.1"
+    wide-align "^1.1.0"
+
+get-port@^4.2.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/get-port/-/get-port-4.2.0.tgz#e37368b1e863b7629c43c5a323625f95cf24b119"
+  integrity sha512-/b3jarXkH8KJoOMQc3uVGHASwGLPq3gSFJ7tgJm2diza+bydJPTGOibin2steecKeOylE8oY2JERlVWkAJO6yw==
+
+get-stream@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-3.0.0.tgz#8e943d1358dc37555054ecbe2edb05aa174ede14"
+  integrity sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ=
+
+get-value@^2.0.3, get-value@^2.0.6:
+  version "2.0.6"
+  resolved "https://registry.yarnpkg.com/get-value/-/get-value-2.0.6.tgz#dc15ca1c672387ca76bd37ac0a395ba2042a2c28"
+  integrity sha1-3BXKHGcjh8p2vTesCjlbogQqLCg=
+
+getpass@^0.1.1:
+  version "0.1.7"
+  resolved "https://registry.yarnpkg.com/getpass/-/getpass-0.1.7.tgz#5eff8e3e684d569ae4cb2b1282604e8ba62149fa"
+  integrity sha1-Xv+OPmhNVprkyysSgmBOi6YhSfo=
+  dependencies:
+    assert-plus "^1.0.0"
+
+glob-parent@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-3.1.0.tgz#9e6af6299d8d3bd2bd40430832bd113df906c5ae"
+  integrity sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=
+  dependencies:
+    is-glob "^3.1.0"
+    path-dirname "^1.0.0"
+
+glob@^7.0.3, glob@^7.1.2, glob@^7.1.3:
+  version "7.1.4"
+  resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.4.tgz#aa608a2f6c577ad357e1ae5a5c26d9a8d1969255"
+  integrity sha512-hkLPepehmnKk41pUGm3sYxoFs/umurYfYJCerbXEyFIWcAzvpipAgVkBqqT9RBKMGjnq6kMuyYwha6csxbiM1A==
+  dependencies:
+    fs.realpath "^1.0.0"
+    inflight "^1.0.4"
+    inherits "2"
+    minimatch "^3.0.4"
+    once "^1.3.0"
+    path-is-absolute "^1.0.0"
+
+global-dirs@^0.1.0:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/global-dirs/-/global-dirs-0.1.1.tgz#b319c0dd4607f353f3be9cca4c72fc148c49f445"
+  integrity sha1-sxnA3UYH81PzvpzKTHL8FIxJ9EU=
+  dependencies:
+    ini "^1.3.4"
+
+globals@^11.1.0:
+  version "11.12.0"
+  resolved "https://registry.yarnpkg.com/globals/-/globals-11.12.0.tgz#ab8795338868a0babd8525758018c2a7eb95c42e"
+  integrity sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==
+
+globby@^6.1.0:
+  version "6.1.0"
+  resolved "https://registry.yarnpkg.com/globby/-/globby-6.1.0.tgz#f5a6d70e8395e21c858fb0489d64df02424d506c"
+  integrity sha1-9abXDoOV4hyFj7BInWTfAkJNUGw=
+  dependencies:
+    array-union "^1.0.1"
+    glob "^7.0.3"
+    object-assign "^4.0.1"
+    pify "^2.0.0"
+    pinkie-promise "^2.0.0"
+
+globby@^7.1.1:
+  version "7.1.1"
+  resolved "https://registry.yarnpkg.com/globby/-/globby-7.1.1.tgz#fb2ccff9401f8600945dfada97440cca972b8680"
+  integrity sha1-+yzP+UAfhgCUXfral0QMypcrhoA=
+  dependencies:
+    array-union "^1.0.1"
+    dir-glob "^2.0.0"
+    glob "^7.1.2"
+    ignore "^3.3.5"
+    pify "^3.0.0"
+    slash "^1.0.0"
+
+got@^6.7.1:
+  version "6.7.1"
+  resolved "https://registry.yarnpkg.com/got/-/got-6.7.1.tgz#240cd05785a9a18e561dc1b44b41c763ef1e8db0"
+  integrity sha1-JAzQV4WpoY5WHcG0S0HHY+8ejbA=
+  dependencies:
+    create-error-class "^3.0.0"
+    duplexer3 "^0.1.4"
+    get-stream "^3.0.0"
+    is-redirect "^1.0.0"
+    is-retry-allowed "^1.0.0"
+    is-stream "^1.0.0"
+    lowercase-keys "^1.0.0"
+    safe-buffer "^5.0.1"
+    timed-out "^4.0.0"
+    unzip-response "^2.0.1"
+    url-parse-lax "^1.0.0"
+
+graceful-fs@^4.1.11, graceful-fs@^4.1.15, graceful-fs@^4.1.2:
+  version "4.1.15"
+  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.15.tgz#ffb703e1066e8a0eeaa4c8b80ba9253eeefbfb00"
+  integrity sha512-6uHUhOPEBgQ24HM+r6b/QwWfZq+yiFcipKFrOFiBEnWdy5sdzYoi+pJeQaPI5qOLRFqWmAXUPQNsielzdLoecA==
+
+har-schema@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/har-schema/-/har-schema-2.0.0.tgz#a94c2224ebcac04782a0d9035521f24735b7ec92"
+  integrity sha1-qUwiJOvKwEeCoNkDVSHyRzW37JI=
+
+har-validator@~5.1.0:
+  version "5.1.3"
+  resolved "https://registry.yarnpkg.com/har-validator/-/har-validator-5.1.3.tgz#1ef89ebd3e4996557675eed9893110dc350fa080"
+  integrity sha512-sNvOCzEQNr/qrvJgc3UG/kD4QtlHycrzwS+6mfTrrSq97BvaYcPZZI1ZSqGSPR73Cxn4LKTD4PttRwfU7jWq5g==
+  dependencies:
+    ajv "^6.5.5"
+    har-schema "^2.0.0"
+
+has-flag@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-3.0.0.tgz#b5d454dc2199ae225699f3467e5a07f3b955bafd"
+  integrity sha1-tdRU3CGZriJWmfNGfloH87lVuv0=
+
+has-unicode@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/has-unicode/-/has-unicode-2.0.1.tgz#e0e6fe6a28cf51138855e086d1691e771de2a8b9"
+  integrity sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=
+
+has-value@^0.3.1:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/has-value/-/has-value-0.3.1.tgz#7b1f58bada62ca827ec0a2078025654845995e1f"
+  integrity sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=
+  dependencies:
+    get-value "^2.0.3"
+    has-values "^0.1.4"
+    isobject "^2.0.0"
+
+has-value@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/has-value/-/has-value-1.0.0.tgz#18b281da585b1c5c51def24c930ed29a0be6b177"
+  integrity sha1-GLKB2lhbHFxR3vJMkw7SmgvmsXc=
+  dependencies:
+    get-value "^2.0.6"
+    has-values "^1.0.0"
+    isobject "^3.0.0"
+
+has-values@^0.1.4:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/has-values/-/has-values-0.1.4.tgz#6d61de95d91dfca9b9a02089ad384bff8f62b771"
+  integrity sha1-bWHeldkd/Km5oCCJrThL/49it3E=
+
+has-values@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/has-values/-/has-values-1.0.0.tgz#95b0b63fec2146619a6fe57fe75628d5a39efe4f"
+  integrity sha1-lbC2P+whRmGab+V/51Yo1aOe/k8=
+  dependencies:
+    is-number "^3.0.0"
+    kind-of "^4.0.0"
+
+hasha@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/hasha/-/hasha-3.0.0.tgz#52a32fab8569d41ca69a61ff1a214f8eb7c8bd39"
+  integrity sha1-UqMvq4Vp1BymmmH/GiFPjrfIvTk=
+  dependencies:
+    is-stream "^1.0.1"
+
+hosted-git-info@^2.1.4:
+  version "2.7.1"
+  resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-2.7.1.tgz#97f236977bd6e125408930ff6de3eec6281ec047"
+  integrity sha512-7T/BxH19zbcCTa8XkMlbK5lTo1WtgkFi3GvdWEyNuc4Vex7/9Dqbnpsf4JMydcfj9HCg4zUWFTL3Za6lapg5/w==
+
+http-signature@~1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/http-signature/-/http-signature-1.2.0.tgz#9aecd925114772f3d95b65a60abb8f7c18fbace1"
+  integrity sha1-muzZJRFHcvPZW2WmCruPfBj7rOE=
+  dependencies:
+    assert-plus "^1.0.0"
+    jsprim "^1.2.2"
+    sshpk "^1.7.0"
+
+iconv-lite@^0.4.4:
+  version "0.4.24"
+  resolved "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.4.24.tgz#2022b4b25fbddc21d2f524974a474aafe733908b"
+  integrity sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==
+  dependencies:
+    safer-buffer ">= 2.1.2 < 3"
+
+ignore-by-default@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/ignore-by-default/-/ignore-by-default-1.0.1.tgz#48ca6d72f6c6a3af00a9ad4ae6876be3889e2b09"
+  integrity sha1-SMptcvbGo68Aqa1K5odr44ieKwk=
+
+ignore-walk@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/ignore-walk/-/ignore-walk-3.0.1.tgz#a83e62e7d272ac0e3b551aaa82831a19b69f82f8"
+  integrity sha512-DTVlMx3IYPe0/JJcYP7Gxg7ttZZu3IInhuEhbchuqneY9wWe5Ojy2mXLBaQFUQmo0AW2r3qG7m1mg86js+gnlQ==
+  dependencies:
+    minimatch "^3.0.4"
+
+ignore@^3.3.5:
+  version "3.3.10"
+  resolved "https://registry.yarnpkg.com/ignore/-/ignore-3.3.10.tgz#0a97fb876986e8081c631160f8f9f389157f0043"
+  integrity sha512-Pgs951kaMm5GXP7MOvxERINe3gsaVjUWFm+UZPSq9xYriQAksyhg0csnS0KXSNRD5NmNdapXEpjxG49+AKh/ug==
+
+import-lazy@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/import-lazy/-/import-lazy-2.1.0.tgz#05698e3d45c88e8d7e9d92cb0584e77f096f3e43"
+  integrity sha1-BWmOPUXIjo1+nZLLBYTnfwlvPkM=
+
+import-local@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/import-local/-/import-local-2.0.0.tgz#55070be38a5993cf18ef6db7e961f5bee5c5a09d"
+  integrity sha512-b6s04m3O+s3CGSbqDIyP4R6aAwAeYlVq9+WUWep6iHa8ETRf9yei1U48C5MmfJmV9AiLYYBKPMq/W+/WRpQmCQ==
+  dependencies:
+    pkg-dir "^3.0.0"
+    resolve-cwd "^2.0.0"
+
+imurmurhash@^0.1.4:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/imurmurhash/-/imurmurhash-0.1.4.tgz#9218b9b2b928a238b13dc4fb6b6d576f231453ea"
+  integrity sha1-khi5srkoojixPcT7a21XbyMUU+o=
+
+indent-string@^3.0.0, indent-string@^3.2.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/indent-string/-/indent-string-3.2.0.tgz#4a5fd6d27cc332f37e5419a504dbb837105c9289"
+  integrity sha1-Sl/W0nzDMvN+VBmlBNu4NxBckok=
+
+inflight@^1.0.4:
+  version "1.0.6"
+  resolved "https://registry.yarnpkg.com/inflight/-/inflight-1.0.6.tgz#49bd6331d7d02d0c09bc910a1075ba8165b56df9"
+  integrity sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=
+  dependencies:
+    once "^1.3.0"
+    wrappy "1"
+
+inherits@2, inherits@^2.0.3, inherits@~2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
+  integrity sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=
+
+ini@^1.3.4, ini@~1.3.0:
+  version "1.3.5"
+  resolved "https://registry.yarnpkg.com/ini/-/ini-1.3.5.tgz#eee25f56db1c9ec6085e0c22778083f596abf927"
+  integrity sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw==
+
+irregular-plurals@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/irregular-plurals/-/irregular-plurals-2.0.0.tgz#39d40f05b00f656d0b7fa471230dd3b714af2872"
+  integrity sha512-Y75zBYLkh0lJ9qxeHlMjQ7bSbyiSqNW/UOPWDmzC7cXskL1hekSITh1Oc6JV0XCWWZ9DE8VYSB71xocLk3gmGw==
+
+is-accessor-descriptor@^0.1.6:
+  version "0.1.6"
+  resolved "https://registry.yarnpkg.com/is-accessor-descriptor/-/is-accessor-descriptor-0.1.6.tgz#a9e12cb3ae8d876727eeef3843f8a0897b5c98d6"
+  integrity sha1-qeEss66Nh2cn7u84Q/igiXtcmNY=
+  dependencies:
+    kind-of "^3.0.2"
+
+is-accessor-descriptor@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz#169c2f6d3df1f992618072365c9b0ea1f6878656"
+  integrity sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ==
+  dependencies:
+    kind-of "^6.0.0"
+
+is-arrayish@^0.2.1:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.2.1.tgz#77c99840527aa8ecb1a8ba697b80645a7a926a9d"
+  integrity sha1-d8mYQFJ6qOyxqLppe4BkWnqSap0=
+
+is-binary-path@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-binary-path/-/is-binary-path-1.0.1.tgz#75f16642b480f187a711c814161fd3a4a7655898"
+  integrity sha1-dfFmQrSA8YenEcgUFh/TpKdlWJg=
+  dependencies:
+    binary-extensions "^1.0.0"
+
+is-buffer@^1.1.5:
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/is-buffer/-/is-buffer-1.1.6.tgz#efaa2ea9daa0d7ab2ea13a97b2b8ad51fefbe8be"
+  integrity sha512-NcdALwpXkTm5Zvvbk7owOUSvVvBKDgKP5/ewfXEznmQFfs4ZRmanOeKBTjRVjka3QFoN6XJ+9F3USqfHqTaU5w==
+
+is-ci@^1.0.10:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/is-ci/-/is-ci-1.2.1.tgz#e3779c8ee17fccf428488f6e281187f2e632841c"
+  integrity sha512-s6tfsaQaQi3JNciBH6shVqEDvhGut0SUXr31ag8Pd8BBbVVlcGfWhpPmEOoM6RJ5TFhbypvf5yyRw/VXW1IiWg==
+  dependencies:
+    ci-info "^1.5.0"
+
+is-ci@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/is-ci/-/is-ci-2.0.0.tgz#6bc6334181810e04b5c22b3d589fdca55026404c"
+  integrity sha512-YfJT7rkpQB0updsdHLGWrvhBJfcfzNNawYDNIyQXJz0IViGf75O8EBPKSdvw2rF+LGCsX4FZ8tcr3b19LcZq4w==
+  dependencies:
+    ci-info "^2.0.0"
+
+is-data-descriptor@^0.1.4:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz#0b5ee648388e2c860282e793f1856fec3f301b56"
+  integrity sha1-C17mSDiOLIYCgueT8YVv7D8wG1Y=
+  dependencies:
+    kind-of "^3.0.2"
+
+is-data-descriptor@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz#d84876321d0e7add03990406abbbbd36ba9268c7"
+  integrity sha512-jbRXy1FmtAoCjQkVmIVYwuuqDFUbaOeDjmed1tOGPrsMhtJA4rD9tkgA0F1qJ3gRFRXcHYVkdeaP50Q5rE/jLQ==
+  dependencies:
+    kind-of "^6.0.0"
+
+is-descriptor@^0.1.0:
+  version "0.1.6"
+  resolved "https://registry.yarnpkg.com/is-descriptor/-/is-descriptor-0.1.6.tgz#366d8240dde487ca51823b1ab9f07a10a78251ca"
+  integrity sha512-avDYr0SB3DwO9zsMov0gKCESFYqCnE4hq/4z3TdUlukEy5t9C0YRq7HLrsN52NAcqXKaepeCD0n+B0arnVG3Hg==
+  dependencies:
+    is-accessor-descriptor "^0.1.6"
+    is-data-descriptor "^0.1.4"
+    kind-of "^5.0.0"
+
+is-descriptor@^1.0.0, is-descriptor@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/is-descriptor/-/is-descriptor-1.0.2.tgz#3b159746a66604b04f8c81524ba365c5f14d86ec"
+  integrity sha512-2eis5WqQGV7peooDyLmNEPUrps9+SXX5c9pL3xEB+4e9HnGuDa7mB7kHxHw4CbqS9k1T2hOH3miL8n8WtiYVtg==
+  dependencies:
+    is-accessor-descriptor "^1.0.0"
+    is-data-descriptor "^1.0.0"
+    kind-of "^6.0.2"
+
+is-error@^2.2.1:
+  version "2.2.2"
+  resolved "https://registry.yarnpkg.com/is-error/-/is-error-2.2.2.tgz#c10ade187b3c93510c5470a5567833ee25649843"
+  integrity sha512-IOQqts/aHWbiisY5DuPJQ0gcbvaLFCa7fBa9xoLfxBZvQ+ZI/Zh9xoI7Gk+G64N0FdK4AbibytHht2tWgpJWLg==
+
+is-extendable@^0.1.0, is-extendable@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/is-extendable/-/is-extendable-0.1.1.tgz#62b110e289a471418e3ec36a617d472e301dfc89"
+  integrity sha1-YrEQ4omkcUGOPsNqYX1HLjAd/Ik=
+
+is-extendable@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-extendable/-/is-extendable-1.0.1.tgz#a7470f9e426733d81bd81e1155264e3a3507cab4"
+  integrity sha512-arnXMxT1hhoKo9k1LZdmlNyJdDDfy2v0fXjFlmok4+i8ul/6WlbVge9bhM74OpNPQPMGUToDtz+KXa1PneJxOA==
+  dependencies:
+    is-plain-object "^2.0.4"
+
+is-extglob@^2.1.0, is-extglob@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/is-extglob/-/is-extglob-2.1.1.tgz#a88c02535791f02ed37c76a1b9ea9773c833f8c2"
+  integrity sha1-qIwCU1eR8C7TfHahueqXc8gz+MI=
+
+is-fullwidth-code-point@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz#ef9e31386f031a7f0d643af82fde50c457ef00cb"
+  integrity sha1-754xOG8DGn8NZDr4L95QxFfvAMs=
+  dependencies:
+    number-is-nan "^1.0.0"
+
+is-fullwidth-code-point@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz#a3b30a5c4f199183167aaab93beefae3ddfb654f"
+  integrity sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=
+
+is-glob@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-3.1.0.tgz#7ba5ae24217804ac70707b96922567486cc3e84a"
+  integrity sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=
+  dependencies:
+    is-extglob "^2.1.0"
+
+is-glob@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-4.0.1.tgz#7567dbe9f2f5e2467bc77ab83c4a29482407a5dc"
+  integrity sha512-5G0tKtBTFImOqDnLB2hG6Bp2qcKEFduo4tZu9MT/H6NQv/ghhy30o55ufafxJ/LdH79LLs2Kfrn85TLKyA7BUg==
+  dependencies:
+    is-extglob "^2.1.1"
+
+is-installed-globally@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/is-installed-globally/-/is-installed-globally-0.1.0.tgz#0dfd98f5a9111716dd535dda6492f67bf3d25a80"
+  integrity sha1-Df2Y9akRFxbdU13aZJL2e/PSWoA=
+  dependencies:
+    global-dirs "^0.1.0"
+    is-path-inside "^1.0.0"
+
+is-npm@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-npm/-/is-npm-1.0.0.tgz#f2fb63a65e4905b406c86072765a1a4dc793b9f4"
+  integrity sha1-8vtjpl5JBbQGyGBydloaTceTufQ=
+
+is-number@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/is-number/-/is-number-3.0.0.tgz#24fd6201a4782cf50561c810276afc7d12d71195"
+  integrity sha1-JP1iAaR4LPUFYcgQJ2r8fRLXEZU=
+  dependencies:
+    kind-of "^3.0.2"
+
+is-obj@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-obj/-/is-obj-1.0.1.tgz#3e4729ac1f5fde025cd7d83a896dab9f4f67db0f"
+  integrity sha1-PkcprB9f3gJc19g6iW2rn09n2w8=
+
+is-observable@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/is-observable/-/is-observable-0.2.0.tgz#b361311d83c6e5d726cabf5e250b0237106f5ae2"
+  integrity sha1-s2ExHYPG5dcmyr9eJQsCNxBvWuI=
+  dependencies:
+    symbol-observable "^0.2.2"
+
+is-observable@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-observable/-/is-observable-1.1.0.tgz#b3e986c8f44de950867cab5403f5a3465005975e"
+  integrity sha512-NqCa4Sa2d+u7BWc6CukaObG3Fh+CU9bvixbpcXYhy2VvYS7vVGIdAgnIS5Ks3A/cqk4rebLJ9s8zBstT2aKnIA==
+  dependencies:
+    symbol-observable "^1.1.0"
+
+is-path-cwd@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/is-path-cwd/-/is-path-cwd-2.1.0.tgz#2e0c7e463ff5b7a0eb60852d851a6809347a124c"
+  integrity sha512-Sc5j3/YnM8tDeyCsVeKlm/0p95075DyLmDEIkSgQ7mXkrOX+uTCtmQFm0CYzVyJwcCCmO3k8qfJt17SxQwB5Zw==
+
+is-path-in-cwd@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/is-path-in-cwd/-/is-path-in-cwd-2.1.0.tgz#bfe2dca26c69f397265a4009963602935a053acb"
+  integrity sha512-rNocXHgipO+rvnP6dk3zI20RpOtrAM/kzbB258Uw5BWr3TpXi861yzjo16Dn4hUox07iw5AyeMLHWsujkjzvRQ==
+  dependencies:
+    is-path-inside "^2.1.0"
+
+is-path-inside@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-path-inside/-/is-path-inside-1.0.1.tgz#8ef5b7de50437a3fdca6b4e865ef7aa55cb48036"
+  integrity sha1-jvW33lBDej/cprToZe96pVy0gDY=
+  dependencies:
+    path-is-inside "^1.0.1"
+
+is-path-inside@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/is-path-inside/-/is-path-inside-2.1.0.tgz#7c9810587d659a40d27bcdb4d5616eab059494b2"
+  integrity sha512-wiyhTzfDWsvwAW53OBWF5zuvaOGlZ6PwYxAbPVDhpm+gM09xKQGjBq/8uYN12aDvMxnAnq3dxTyoSoRNmg5YFg==
+  dependencies:
+    path-is-inside "^1.0.2"
+
+is-plain-obj@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-plain-obj/-/is-plain-obj-1.1.0.tgz#71a50c8429dfca773c92a390a4a03b39fcd51d3e"
+  integrity sha1-caUMhCnfync8kqOQpKA7OfzVHT4=
+
+is-plain-object@^2.0.1, is-plain-object@^2.0.3, is-plain-object@^2.0.4:
+  version "2.0.4"
+  resolved "https://registry.yarnpkg.com/is-plain-object/-/is-plain-object-2.0.4.tgz#2c163b3fafb1b606d9d17928f05c2a1c38e07677"
+  integrity sha512-h5PpgXkWitc38BBMYawTYMWJHFZJVnBquFE57xFpjB8pJFiF6gZ+bU+WyI/yqXiFR5mdLsgYNaPe8uao6Uv9Og==
+  dependencies:
+    isobject "^3.0.1"
+
+is-promise@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/is-promise/-/is-promise-2.1.0.tgz#79a2a9ece7f096e80f36d2b2f3bc16c1ff4bf3fa"
+  integrity sha1-eaKp7OfwlugPNtKy87wWwf9L8/o=
+
+is-redirect@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-redirect/-/is-redirect-1.0.0.tgz#1d03dded53bd8db0f30c26e4f95d36fc7c87dc24"
+  integrity sha1-HQPd7VO9jbDzDCbk+V02/HyH3CQ=
+
+is-retry-allowed@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-retry-allowed/-/is-retry-allowed-1.1.0.tgz#11a060568b67339444033d0125a61a20d564fb34"
+  integrity sha1-EaBgVotnM5REAz0BJaYaINVk+zQ=
+
+is-stream@^1.0.0, is-stream@^1.0.1, is-stream@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-stream/-/is-stream-1.1.0.tgz#12d4a3dd4e68e0b79ceb8dbc84173ae80d91ca44"
+  integrity sha1-EtSj3U5o4Lec6428hBc66A2RykQ=
+
+is-typedarray@~1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-typedarray/-/is-typedarray-1.0.0.tgz#e479c80858df0c1b11ddda6940f96011fcda4a9a"
+  integrity sha1-5HnICFjfDBsR3dppQPlgEfzaSpo=
+
+is-url@^1.2.1:
+  version "1.2.4"
+  resolved "https://registry.yarnpkg.com/is-url/-/is-url-1.2.4.tgz#04a4df46d28c4cff3d73d01ff06abeb318a1aa52"
+  integrity sha512-ITvGim8FhRiYe4IQ5uHSkj7pVaPDrCTkNd3yq3cV7iZAcJdHTUMPMEHcqSOy9xZ9qFenQCvi+2wjH9a1nXqHww==
+
+is-utf8@^0.2.1:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/is-utf8/-/is-utf8-0.2.1.tgz#4b0da1442104d1b336340e80797e865cf39f7d72"
+  integrity sha1-Sw2hRCEE0bM2NA6AeX6GXPOffXI=
+
+is-windows@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.2.tgz#d1850eb9791ecd18e6182ce12a30f396634bb19d"
+  integrity sha512-eXK1UInq2bPmjyX6e3VHIzMLobc4J94i4AWn+Hpq3OU5KkrRC96OAcR3PRJ/pGu6m8TRnBHP9dkXQVsT/COVIA==
+
+isarray@1.0.0, isarray@~1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
+  integrity sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=
+
+isexe@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/isexe/-/isexe-2.0.0.tgz#e8fbf374dc556ff8947a10dcb0572d633f2cfa10"
+  integrity sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=
+
+isobject@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/isobject/-/isobject-2.1.0.tgz#f065561096a3f1da2ef46272f815c840d87e0c89"
+  integrity sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk=
+  dependencies:
+    isarray "1.0.0"
+
+isobject@^3.0.0, isobject@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/isobject/-/isobject-3.0.1.tgz#4e431e92b11a9731636aa1f9c8d1ccbcfdab78df"
+  integrity sha1-TkMekrEalzFjaqH5yNHMvP2reN8=
+
+isstream@~0.1.2:
+  version "0.1.2"
+  resolved "https://registry.yarnpkg.com/isstream/-/isstream-0.1.2.tgz#47e63f7af55afa6f92e1500e690eb8b8529c099a"
+  integrity sha1-R+Y/evVa+m+S4VAOaQ64uFKcCZo=
+
+js-string-escape@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/js-string-escape/-/js-string-escape-1.0.1.tgz#e2625badbc0d67c7533e9edc1068c587ae4137ef"
+  integrity sha1-4mJbrbwNZ8dTPp7cEGjFh65BN+8=
+
+js-tokens@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-4.0.0.tgz#19203fb59991df98e3a287050d4647cdeaf32499"
+  integrity sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==
+
+js-yaml@^3.10.0:
+  version "3.13.1"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.13.1.tgz#aff151b30bfdfa8e49e05da22e7415e9dfa37847"
+  integrity sha512-YfbcO7jXDdyj0DGxYVSlSeQNHbD7XPWvrVWeVUujrQEoZzWJIRrCPoyk6kL6IAjAG2IolMK4T0hNUe0HOUs5Jw==
+  dependencies:
+    argparse "^1.0.7"
+    esprima "^4.0.0"
+
+jsbn@~0.1.0:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/jsbn/-/jsbn-0.1.1.tgz#a5e654c2e5a2deb5f201d96cefbca80c0ef2f513"
+  integrity sha1-peZUwuWi3rXyAdls77yoDA7y9RM=
+
+jsesc@^2.5.1:
+  version "2.5.2"
+  resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-2.5.2.tgz#80564d2e483dacf6e8ef209650a67df3f0c283a4"
+  integrity sha512-OYu7XEzjkCQ3C5Ps3QIZsQfNpqoJyZZA99wd9aWd05NCtC5pWOkShK2mkL6HXQR6/Cy2lbNdPlZBpuQHXE63gA==
+
+jsesc@~0.5.0:
+  version "0.5.0"
+  resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-0.5.0.tgz#e7dee66e35d6fc16f710fe91d5cf69f70f08911d"
+  integrity sha1-597mbjXW/Bb3EP6R1c9p9w8IkR0=
+
+json-parse-better-errors@^1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz#bb867cfb3450e69107c131d1c514bab3dc8bcaa9"
+  integrity sha512-mrqyZKfX5EhL7hvqcV6WG1yYjnjeuYDzDhhcAAUrq8Po85NBQBJP+ZDUT75qZQ98IkUoBqdkExkukOU7Ts2wrw==
+
+json-schema-traverse@^0.4.1:
+  version "0.4.1"
+  resolved "https://registry.yarnpkg.com/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz#69f6a87d9513ab8bb8fe63bdb0979c448e684660"
+  integrity sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==
+
+json-schema@0.2.3:
+  version "0.2.3"
+  resolved "https://registry.yarnpkg.com/json-schema/-/json-schema-0.2.3.tgz#b480c892e59a2f05954ce727bd3f2a4e882f9e13"
+  integrity sha1-tIDIkuWaLwWVTOcnvT8qTogvnhM=
+
+json-stringify-safe@~5.0.1:
+  version "5.0.1"
+  resolved "https://registry.yarnpkg.com/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz#1296a2d58fd45f19a0f6ce01d65701e2c735b6eb"
+  integrity sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus=
+
+json5@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/json5/-/json5-2.1.0.tgz#e7a0c62c48285c628d20a10b85c89bb807c32850"
+  integrity sha512-8Mh9h6xViijj36g7Dxi+Y4S6hNGV96vcJZr/SrlHh1LR/pEn/8j/+qIBbs44YKl69Lrfctp4QD+AdWLTMqEZAQ==
+  dependencies:
+    minimist "^1.2.0"
+
+jsprim@^1.2.2:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/jsprim/-/jsprim-1.4.1.tgz#313e66bc1e5cc06e438bc1b7499c2e5c56acb6a2"
+  integrity sha1-MT5mvB5cwG5Di8G3SZwuXFastqI=
+  dependencies:
+    assert-plus "1.0.0"
+    extsprintf "1.3.0"
+    json-schema "0.2.3"
+    verror "1.10.0"
+
+kind-of@^3.0.2, kind-of@^3.0.3, kind-of@^3.2.0:
+  version "3.2.2"
+  resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-3.2.2.tgz#31ea21a734bab9bbb0f32466d893aea51e4a3c64"
+  integrity sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=
+  dependencies:
+    is-buffer "^1.1.5"
+
+kind-of@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-4.0.0.tgz#20813df3d712928b207378691a45066fae72dd57"
+  integrity sha1-IIE989cSkosgc3hpGkUGb65y3Vc=
+  dependencies:
+    is-buffer "^1.1.5"
+
+kind-of@^5.0.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-5.1.0.tgz#729c91e2d857b7a419a1f9aa65685c4c33f5845d"
+  integrity sha512-NGEErnH6F2vUuXDh+OlbcKW7/wOcfdRHaZ7VWtqCztfHri/++YKmP51OdWeGPuqCOba6kk2OTe5d02VmTB80Pw==
+
+kind-of@^6.0.0, kind-of@^6.0.2:
+  version "6.0.2"
+  resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-6.0.2.tgz#01146b36a6218e64e58f3a8d66de5d7fc6f6d051"
+  integrity sha512-s5kLOcnH0XqDO+FvuaLX8DDjZ18CGFk7VygH40QoKPUQhW4e2rvM0rwUq0t8IQDOwYSeLK01U90OjzBTme2QqA==
+
+latest-version@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/latest-version/-/latest-version-3.1.0.tgz#a205383fea322b33b5ae3b18abee0dc2f356ee15"
+  integrity sha1-ogU4P+oyKzO1rjsYq+4NwvNW7hU=
+  dependencies:
+    package-json "^4.0.0"
+
+load-json-file@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/load-json-file/-/load-json-file-4.0.0.tgz#2f5f45ab91e33216234fd53adab668eb4ec0993b"
+  integrity sha1-L19Fq5HjMhYjT9U62rZo607AmTs=
+  dependencies:
+    graceful-fs "^4.1.2"
+    parse-json "^4.0.0"
+    pify "^3.0.0"
+    strip-bom "^3.0.0"
+
+load-json-file@^5.2.0:
+  version "5.3.0"
+  resolved "https://registry.yarnpkg.com/load-json-file/-/load-json-file-5.3.0.tgz#4d3c1e01fa1c03ea78a60ac7af932c9ce53403f3"
+  integrity sha512-cJGP40Jc/VXUsp8/OrnyKyTZ1y6v/dphm3bioS+RrKXjK2BB6wHUd6JptZEFDGgGahMT+InnZO5i1Ei9mpC8Bw==
+  dependencies:
+    graceful-fs "^4.1.15"
+    parse-json "^4.0.0"
+    pify "^4.0.1"
+    strip-bom "^3.0.0"
+    type-fest "^0.3.0"
+
+locate-path@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-2.0.0.tgz#2b568b265eec944c6d9c0de9c3dbbbca0354cd8e"
+  integrity sha1-K1aLJl7slExtnA3pw9u7ygNUzY4=
+  dependencies:
+    p-locate "^2.0.0"
+    path-exists "^3.0.0"
+
+locate-path@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-3.0.0.tgz#dbec3b3ab759758071b58fe59fc41871af21400e"
+  integrity sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==
+  dependencies:
+    p-locate "^3.0.0"
+    path-exists "^3.0.0"
+
+lodash.clone@^4.5.0:
+  version "4.5.0"
+  resolved "https://registry.yarnpkg.com/lodash.clone/-/lodash.clone-4.5.0.tgz#195870450f5a13192478df4bc3d23d2dea1907b6"
+  integrity sha1-GVhwRQ9aExkkeN9Lw9I9LeoZB7Y=
+
+lodash.clonedeep@^4.5.0:
+  version "4.5.0"
+  resolved "https://registry.yarnpkg.com/lodash.clonedeep/-/lodash.clonedeep-4.5.0.tgz#e23f3f9c4f8fbdde872529c1071857a086e5ccef"
+  integrity sha1-4j8/nE+Pvd6HJSnBBxhXoIblzO8=
+
+lodash.clonedeepwith@^4.5.0:
+  version "4.5.0"
+  resolved "https://registry.yarnpkg.com/lodash.clonedeepwith/-/lodash.clonedeepwith-4.5.0.tgz#6ee30573a03a1a60d670a62ef33c10cf1afdbdd4"
+  integrity sha1-buMFc6A6GmDWcKYu8zwQzxr9vdQ=
+
+lodash.debounce@^4.0.3:
+  version "4.0.8"
+  resolved "https://registry.yarnpkg.com/lodash.debounce/-/lodash.debounce-4.0.8.tgz#82d79bff30a67c4005ffd5e2515300ad9ca4d7af"
+  integrity sha1-gteb/zCmfEAF/9XiUVMArZyk168=
+
+lodash.difference@^4.3.0:
+  version "4.5.0"
+  resolved "https://registry.yarnpkg.com/lodash.difference/-/lodash.difference-4.5.0.tgz#9ccb4e505d486b91651345772885a2df27fd017c"
+  integrity sha1-nMtOUF1Ia5FlE0V3KIWi3yf9AXw=
+
+lodash.flatten@^4.2.0:
+  version "4.4.0"
+  resolved "https://registry.yarnpkg.com/lodash.flatten/-/lodash.flatten-4.4.0.tgz#f31c22225a9632d2bbf8e4addbef240aa765a61f"
+  integrity sha1-8xwiIlqWMtK7+OSt2+8kCqdlph8=
+
+lodash.flattendeep@^4.4.0:
+  version "4.4.0"
+  resolved "https://registry.yarnpkg.com/lodash.flattendeep/-/lodash.flattendeep-4.4.0.tgz#fb030917f86a3134e5bc9bec0d69e0013ddfedb2"
+  integrity sha1-+wMJF/hqMTTlvJvsDWngAT3f7bI=
+
+lodash.islength@^4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/lodash.islength/-/lodash.islength-4.0.1.tgz#4e9868d452575d750affd358c979543dc20ed577"
+  integrity sha1-Tpho1FJXXXUK/9NYyXlUPcIO1Xc=
+
+lodash.merge@^4.6.1:
+  version "4.6.1"
+  resolved "https://registry.yarnpkg.com/lodash.merge/-/lodash.merge-4.6.1.tgz#adc25d9cb99b9391c59624f379fbba60d7111d54"
+  integrity sha512-AOYza4+Hf5z1/0Hztxpm2/xiPZgi/cjMqdnKTUWTBSKchJlxXXuUSxCCl8rJlf4g6yww/j6mA8nC8Hw/EZWxKQ==
+
+lodash@^4.17.11:
+  version "4.17.11"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.11.tgz#b39ea6229ef607ecd89e2c8df12536891cac9b8d"
+  integrity sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==
+
+log-symbols@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/log-symbols/-/log-symbols-2.2.0.tgz#5740e1c5d6f0dfda4ad9323b5332107ef6b4c40a"
+  integrity sha512-VeIAFslyIerEJLXHziedo2basKbMKtTw3vfn5IzG0XTjhAVEJyNHnL2p7vc+wBDSdQuUpNw3M2u6xb9QsAY5Eg==
+  dependencies:
+    chalk "^2.0.1"
+
+loud-rejection@^1.0.0, loud-rejection@^1.2.0:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/loud-rejection/-/loud-rejection-1.6.0.tgz#5b46f80147edee578870f086d04821cf998e551f"
+  integrity sha1-W0b4AUft7leIcPCG0Eghz5mOVR8=
+  dependencies:
+    currently-unhandled "^0.4.1"
+    signal-exit "^3.0.0"
+
+lowercase-keys@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/lowercase-keys/-/lowercase-keys-1.0.1.tgz#6f9e30b47084d971a7c820ff15a6c5167b74c26f"
+  integrity sha512-G2Lj61tXDnVFFOi8VZds+SoQjtQC3dgokKdDG2mTm1tx4m50NUHBOZSBwQQHyy0V12A0JTG4icfZQH+xPyh8VA==
+
+lru-cache@^4.0.1:
+  version "4.1.5"
+  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-4.1.5.tgz#8bbe50ea85bed59bc9e33dcab8235ee9bcf443cd"
+  integrity sha512-sWZlbEP2OsHNkXrMl5GYk/jKk70MBng6UU4YI/qGDYbgf6YbP4EvmqISbXCoJiRKs+1bSpFHVgQxvJ17F2li5g==
+  dependencies:
+    pseudomap "^1.0.2"
+    yallist "^2.1.2"
+
+make-dir@^1.0.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/make-dir/-/make-dir-1.3.0.tgz#79c1033b80515bd6d24ec9933e860ca75ee27f0c"
+  integrity sha512-2w31R7SJtieJJnQtGc7RVL2StM2vGYVfqUOvUDxH6bC6aJTxPxTF0GnIgCyu7tjockiUWAYQRbxa7vKn34s5sQ==
+  dependencies:
+    pify "^3.0.0"
+
+make-dir@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/make-dir/-/make-dir-2.1.0.tgz#5f0310e18b8be898cc07009295a30ae41e91e6f5"
+  integrity sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==
+  dependencies:
+    pify "^4.0.1"
+    semver "^5.6.0"
+
+map-cache@^0.2.2:
+  version "0.2.2"
+  resolved "https://registry.yarnpkg.com/map-cache/-/map-cache-0.2.2.tgz#c32abd0bd6525d9b051645bb4f26ac5dc98a0dbf"
+  integrity sha1-wyq9C9ZSXZsFFkW7TyasXcmKDb8=
+
+map-obj@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/map-obj/-/map-obj-1.0.1.tgz#d933ceb9205d82bdcf4886f6742bdc2b4dea146d"
+  integrity sha1-2TPOuSBdgr3PSIb2dCvcK03qFG0=
+
+map-obj@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/map-obj/-/map-obj-2.0.0.tgz#a65cd29087a92598b8791257a523e021222ac1f9"
+  integrity sha1-plzSkIepJZi4eRJXpSPgISIqwfk=
+
+map-visit@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/map-visit/-/map-visit-1.0.0.tgz#ecdca8f13144e660f1b5bd41f12f3479d98dfb8f"
+  integrity sha1-7Nyo8TFE5mDxtb1B8S80edmN+48=
+  dependencies:
+    object-visit "^1.0.0"
+
+matcher@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/matcher/-/matcher-1.1.1.tgz#51d8301e138f840982b338b116bb0c09af62c1c2"
+  integrity sha512-+BmqxWIubKTRKNWx/ahnCkk3mG8m7OturVlqq6HiojGJTd5hVYbgZm6WzcYPCoB+KBT4Vd6R7WSRG2OADNaCjg==
+  dependencies:
+    escape-string-regexp "^1.0.4"
+
+md5-hex@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/md5-hex/-/md5-hex-2.0.0.tgz#d0588e9f1c74954492ecd24ac0ac6ce997d92e33"
+  integrity sha1-0FiOnxx0lUSS7NJKwKxs6ZfZLjM=
+  dependencies:
+    md5-o-matic "^0.1.1"
+
+md5-o-matic@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/md5-o-matic/-/md5-o-matic-0.1.1.tgz#822bccd65e117c514fab176b25945d54100a03c3"
+  integrity sha1-givM1l4RfFFPqxdrJZRdVBAKA8M=
+
+meow@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/meow/-/meow-5.0.0.tgz#dfc73d63a9afc714a5e371760eb5c88b91078aa4"
+  integrity sha512-CbTqYU17ABaLefO8vCU153ZZlprKYWDljcndKKDCFcYQITzWCXZAVk4QMFZPgvzrnUQ3uItnIE/LoUOwrT15Ig==
+  dependencies:
+    camelcase-keys "^4.0.0"
+    decamelize-keys "^1.0.0"
+    loud-rejection "^1.0.0"
+    minimist-options "^3.0.1"
+    normalize-package-data "^2.3.4"
+    read-pkg-up "^3.0.0"
+    redent "^2.0.0"
+    trim-newlines "^2.0.0"
+    yargs-parser "^10.0.0"
+
+micromatch@^3.1.10, micromatch@^3.1.4:
+  version "3.1.10"
+  resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-3.1.10.tgz#70859bc95c9840952f359a068a3fc49f9ecfac23"
+  integrity sha512-MWikgl9n9M3w+bpsY3He8L+w9eF9338xRl8IAO5viDizwSzziFEyUzo2xrrloB64ADbTf8uA8vRqqttDTOmccg==
+  dependencies:
+    arr-diff "^4.0.0"
+    array-unique "^0.3.2"
+    braces "^2.3.1"
+    define-property "^2.0.2"
+    extend-shallow "^3.0.2"
+    extglob "^2.0.4"
+    fragment-cache "^0.2.1"
+    kind-of "^6.0.2"
+    nanomatch "^1.2.9"
+    object.pick "^1.3.0"
+    regex-not "^1.0.0"
+    snapdragon "^0.8.1"
+    to-regex "^3.0.2"
+
+mime-db@1.40.0:
+  version "1.40.0"
+  resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.40.0.tgz#a65057e998db090f732a68f6c276d387d4126c32"
+  integrity sha512-jYdeOMPy9vnxEqFRRo6ZvTZ8d9oPb+k18PKoYNYUe2stVEBPPwsln/qWzdbmaIvnhZ9v2P+CuecK+fpUfsV2mA==
+
+mime-types@^2.1.12, mime-types@~2.1.19:
+  version "2.1.24"
+  resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.24.tgz#b6f8d0b3e951efb77dedeca194cff6d16f676f81"
+  integrity sha512-WaFHS3MCl5fapm3oLxU4eYDw77IQM2ACcxQ9RIxfaC3ooc6PFuBMGZZsYpvoXS5D5QTWPieo1jjLdAm3TBP3cQ==
+  dependencies:
+    mime-db "1.40.0"
+
+mimic-fn@^1.0.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-1.2.0.tgz#820c86a39334640e99516928bd03fca88057d022"
+  integrity sha512-jf84uxzwiuiIVKiOLpfYk7N46TSy8ubTonmneY9vrpHNAnp0QBt2BxWV9dO3/j+BoVAb+a5G6YDPW3M5HOdMWQ==
+
+minimatch@^3.0.4:
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
+  integrity sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==
+  dependencies:
+    brace-expansion "^1.1.7"
+
+minimist-options@^3.0.1:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/minimist-options/-/minimist-options-3.0.2.tgz#fba4c8191339e13ecf4d61beb03f070103f3d954"
+  integrity sha512-FyBrT/d0d4+uiZRbqznPXqw3IpZZG3gl3wKWiX784FycUKVwBt0uLBFkQrtE4tZOrgo78nZp2jnKz3L65T5LdQ==
+  dependencies:
+    arrify "^1.0.1"
+    is-plain-obj "^1.1.0"
+
+minimist@0.0.8:
+  version "0.0.8"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
+  integrity sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=
+
+minimist@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
+  integrity sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=
+
+minipass@^2.2.1, minipass@^2.3.4:
+  version "2.3.5"
+  resolved "https://registry.yarnpkg.com/minipass/-/minipass-2.3.5.tgz#cacebe492022497f656b0f0f51e2682a9ed2d848"
+  integrity sha512-Gi1W4k059gyRbyVUZQ4mEqLm0YIUiGYfvxhF6SIlk3ui1WVxMTGfGdQ2SInh3PDrRTVvPKgULkpJtT4RH10+VA==
+  dependencies:
+    safe-buffer "^5.1.2"
+    yallist "^3.0.0"
+
+minizlib@^1.1.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/minizlib/-/minizlib-1.2.1.tgz#dd27ea6136243c7c880684e8672bb3a45fd9b614"
+  integrity sha512-7+4oTUOWKg7AuL3vloEWekXY2/D20cevzsrNT2kGWm+39J9hGTCBv8VI5Pm5lXZ/o3/mdR4f8rflAPhnQb8mPA==
+  dependencies:
+    minipass "^2.2.1"
+
+mixin-deep@^1.2.0:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/mixin-deep/-/mixin-deep-1.3.1.tgz#a49e7268dce1a0d9698e45326c5626df3543d0fe"
+  integrity sha512-8ZItLHeEgaqEvd5lYBXfm4EZSFCX29Jb9K+lAHhDKzReKBQKj3R+7NOF6tjqYi9t4oI8VUfaWITJQm86wnXGNQ==
+  dependencies:
+    for-in "^1.0.2"
+    is-extendable "^1.0.1"
+
+mkdirp@^0.5.0, mkdirp@^0.5.1:
+  version "0.5.1"
+  resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
+  integrity sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=
+  dependencies:
+    minimist "0.0.8"
+
+ms@2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
+  integrity sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=
+
+ms@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.1.tgz#30a5864eb3ebb0a66f2ebe6d727af06a09d86e0a"
+  integrity sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==
+
+multimatch@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/multimatch/-/multimatch-3.0.0.tgz#0e2534cc6bc238d9ab67e1b9cd5fcd85a6dbf70b"
+  integrity sha512-22foS/gqQfANZ3o+W7ST2x25ueHDVNWl/b9OlGcLpy/iKxjCpvcNCM51YCenUi7Mt/jAjjqv8JwZRs8YP5sRjA==
+  dependencies:
+    array-differ "^2.0.3"
+    array-union "^1.0.2"
+    arrify "^1.0.1"
+    minimatch "^3.0.4"
+
+nan@^2.12.1:
+  version "2.14.0"
+  resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.0.tgz#7818f722027b2459a86f0295d434d1fc2336c52c"
+  integrity sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg==
+
+nanomatch@^1.2.9:
+  version "1.2.13"
+  resolved "https://registry.yarnpkg.com/nanomatch/-/nanomatch-1.2.13.tgz#b87a8aa4fc0de8fe6be88895b38983ff265bd119"
+  integrity sha512-fpoe2T0RbHwBTBUOftAfBPaDEi06ufaUai0mE6Yn1kacc3SnTErfb/h+X94VXzI64rKFHYImXSvdwGGCmwOqCA==
+  dependencies:
+    arr-diff "^4.0.0"
+    array-unique "^0.3.2"
+    define-property "^2.0.2"
+    extend-shallow "^3.0.2"
+    fragment-cache "^0.2.1"
+    is-windows "^1.0.2"
+    kind-of "^6.0.2"
+    object.pick "^1.3.0"
+    regex-not "^1.0.0"
+    snapdragon "^0.8.1"
+    to-regex "^3.0.1"
+
+needle@^2.2.1:
+  version "2.4.0"
+  resolved "https://registry.yarnpkg.com/needle/-/needle-2.4.0.tgz#6833e74975c444642590e15a750288c5f939b57c"
+  integrity sha512-4Hnwzr3mi5L97hMYeNl8wRW/Onhy4nUKR/lVemJ8gJedxxUyBLm9kkrDColJvoSfwi0jCNhD+xCdOtiGDQiRZg==
+  dependencies:
+    debug "^3.2.6"
+    iconv-lite "^0.4.4"
+    sax "^1.2.4"
+
+node-pre-gyp@^0.11.0:
+  version "0.11.0"
+  resolved "https://registry.yarnpkg.com/node-pre-gyp/-/node-pre-gyp-0.11.0.tgz#db1f33215272f692cd38f03238e3e9b47c5dd054"
+  integrity sha512-TwWAOZb0j7e9eGaf9esRx3ZcLaE5tQ2lvYy1pb5IAaG1a2e2Kv5Lms1Y4hpj+ciXJRofIxxlt5haeQ/2ANeE0Q==
+  dependencies:
+    detect-libc "^1.0.2"
+    mkdirp "^0.5.1"
+    needle "^2.2.1"
+    nopt "^4.0.1"
+    npm-packlist "^1.1.6"
+    npmlog "^4.0.2"
+    rc "^1.2.7"
+    rimraf "^2.6.1"
+    semver "^5.3.0"
+    tar "^4"
+
+node-pre-gyp@^0.12.0:
+  version "0.12.0"
+  resolved "https://registry.yarnpkg.com/node-pre-gyp/-/node-pre-gyp-0.12.0.tgz#39ba4bb1439da030295f899e3b520b7785766149"
+  integrity sha512-4KghwV8vH5k+g2ylT+sLTjy5wmUOb9vPhnM8NHvRf9dHmnW/CndrFXy2aRPaPST6dugXSdHXfeaHQm77PIz/1A==
+  dependencies:
+    detect-libc "^1.0.2"
+    mkdirp "^0.5.1"
+    needle "^2.2.1"
+    nopt "^4.0.1"
+    npm-packlist "^1.1.6"
+    npmlog "^4.0.2"
+    rc "^1.2.7"
+    rimraf "^2.6.1"
+    semver "^5.3.0"
+    tar "^4"
+
+nopt@^4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/nopt/-/nopt-4.0.1.tgz#d0d4685afd5415193c8c7505602d0d17cd64474d"
+  integrity sha1-0NRoWv1UFRk8jHUFYC0NF81kR00=
+  dependencies:
+    abbrev "1"
+    osenv "^0.1.4"
+
+normalize-package-data@^2.3.2, normalize-package-data@^2.3.4:
+  version "2.5.0"
+  resolved "https://registry.yarnpkg.com/normalize-package-data/-/normalize-package-data-2.5.0.tgz#e66db1838b200c1dfc233225d12cb36520e234a8"
+  integrity sha512-/5CMN3T0R4XTj4DcGaexo+roZSdSFW/0AOOTROrjxzCG1wrWXEsGbRKevjlIL+ZDE4sZlJr5ED4YW0yqmkK+eA==
+  dependencies:
+    hosted-git-info "^2.1.4"
+    resolve "^1.10.0"
+    semver "2 || 3 || 4 || 5"
+    validate-npm-package-license "^3.0.1"
+
+normalize-path@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-2.1.1.tgz#1ab28b556e198363a8c1a6f7e6fa20137fe6aed9"
+  integrity sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=
+  dependencies:
+    remove-trailing-separator "^1.0.1"
+
+normalize-path@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-3.0.0.tgz#0dcd69ff23a1c9b11fd0978316644a0388216a65"
+  integrity sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==
+
+npm-bundled@^1.0.1:
+  version "1.0.6"
+  resolved "https://registry.yarnpkg.com/npm-bundled/-/npm-bundled-1.0.6.tgz#e7ba9aadcef962bb61248f91721cd932b3fe6bdd"
+  integrity sha512-8/JCaftHwbd//k6y2rEWp6k1wxVfpFzB6t1p825+cUb7Ym2XQfhwIC5KwhrvzZRJu+LtDE585zVaS32+CGtf0g==
+
+npm-packlist@^1.1.6:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/npm-packlist/-/npm-packlist-1.4.1.tgz#19064cdf988da80ea3cee45533879d90192bbfbc"
+  integrity sha512-+TcdO7HJJ8peiiYhvPxsEDhF3PJFGUGRcFsGve3vxvxdcpO2Z4Z7rkosRM0kWj6LfbK/P0gu3dzk5RU1ffvFcw==
+  dependencies:
+    ignore-walk "^3.0.1"
+    npm-bundled "^1.0.1"
+
+npm-run-path@^2.0.0:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/npm-run-path/-/npm-run-path-2.0.2.tgz#35a9232dfa35d7067b4cb2ddf2357b1871536c5f"
+  integrity sha1-NakjLfo11wZ7TLLd8jV7GHFTbF8=
+  dependencies:
+    path-key "^2.0.0"
+
+npmlog@^4.0.2:
+  version "4.1.2"
+  resolved "https://registry.yarnpkg.com/npmlog/-/npmlog-4.1.2.tgz#08a7f2a8bf734604779a9efa4ad5cc717abb954b"
+  integrity sha512-2uUqazuKlTaSI/dC8AzicUck7+IrEaOnN/e0jd3Xtt1KcGpwx30v50mL7oPyr/h9bL3E4aZccVwpwP+5W9Vjkg==
+  dependencies:
+    are-we-there-yet "~1.1.2"
+    console-control-strings "~1.1.0"
+    gauge "~2.7.3"
+    set-blocking "~2.0.0"
+
+number-is-nan@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/number-is-nan/-/number-is-nan-1.0.1.tgz#097b602b53422a522c1afb8790318336941a011d"
+  integrity sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=
+
+oauth-sign@~0.9.0:
+  version "0.9.0"
+  resolved "https://registry.yarnpkg.com/oauth-sign/-/oauth-sign-0.9.0.tgz#47a7b016baa68b5fa0ecf3dee08a85c679ac6455"
+  integrity sha512-fexhUFFPTGV8ybAtSIGbV6gOkSv8UtRbDBnAyLQw4QPKkgNlsH2ByPGtMUqdWkos6YCRmAqViwgZrJc/mRDzZQ==
+
+object-assign@^4.0.1, object-assign@^4.1.0:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
+  integrity sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=
+
+object-copy@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/object-copy/-/object-copy-0.1.0.tgz#7e7d858b781bd7c991a41ba975ed3812754e998c"
+  integrity sha1-fn2Fi3gb18mRpBupde04EnVOmYw=
+  dependencies:
+    copy-descriptor "^0.1.0"
+    define-property "^0.2.5"
+    kind-of "^3.0.3"
+
+object-visit@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/object-visit/-/object-visit-1.0.1.tgz#f79c4493af0c5377b59fe39d395e41042dd045bb"
+  integrity sha1-95xEk68MU3e1n+OdOV5BBC3QRbs=
+  dependencies:
+    isobject "^3.0.0"
+
+object.pick@^1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/object.pick/-/object.pick-1.3.0.tgz#87a10ac4c1694bd2e1cbf53591a66141fb5dd747"
+  integrity sha1-h6EKxMFpS9Lhy/U1kaZhQftd10c=
+  dependencies:
+    isobject "^3.0.1"
+
+observable-to-promise@^0.5.0:
+  version "0.5.0"
+  resolved "https://registry.yarnpkg.com/observable-to-promise/-/observable-to-promise-0.5.0.tgz#c828f0f0dc47e9f86af8a4977c5d55076ce7a91f"
+  integrity sha1-yCjw8NxH6fhq+KSXfF1VB2znqR8=
+  dependencies:
+    is-observable "^0.2.0"
+    symbol-observable "^1.0.4"
+
+once@^1.3.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/once/-/once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"
+  integrity sha1-WDsap3WWHUsROsF9nFC6753Xa9E=
+  dependencies:
+    wrappy "1"
+
+onetime@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/onetime/-/onetime-2.0.1.tgz#067428230fd67443b2794b22bba528b6867962d4"
+  integrity sha1-BnQoIw/WdEOyeUsiu6UotoZ5YtQ=
+  dependencies:
+    mimic-fn "^1.0.0"
+
+ora@^3.2.0:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/ora/-/ora-3.4.0.tgz#bf0752491059a3ef3ed4c85097531de9fdbcd318"
+  integrity sha512-eNwHudNbO1folBP3JsZ19v9azXWtQZjICdr3Q0TDPIaeBQ3mXLrh54wM+er0+hSp+dWKf+Z8KM58CYzEyIYxYg==
+  dependencies:
+    chalk "^2.4.2"
+    cli-cursor "^2.1.0"
+    cli-spinners "^2.0.0"
+    log-symbols "^2.2.0"
+    strip-ansi "^5.2.0"
+    wcwidth "^1.0.1"
+
+os-homedir@^1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/os-homedir/-/os-homedir-1.0.2.tgz#ffbc4988336e0e833de0c168c7ef152121aa7fb3"
+  integrity sha1-/7xJiDNuDoM94MFox+8VISGqf7M=
+
+os-tmpdir@^1.0.0, os-tmpdir@^1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
+  integrity sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=
+
+osenv@^0.1.4:
+  version "0.1.5"
+  resolved "https://registry.yarnpkg.com/osenv/-/osenv-0.1.5.tgz#85cdfafaeb28e8677f416e287592b5f3f49ea410"
+  integrity sha512-0CWcCECdMVc2Rw3U5w9ZjqX6ga6ubk1xDVKxtBQPK7wis/0F2r9T6k4ydGYhecl7YUBxBVxhL5oisPsNxAPe2g==
+  dependencies:
+    os-homedir "^1.0.0"
+    os-tmpdir "^1.0.0"
+
+p-finally@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/p-finally/-/p-finally-1.0.0.tgz#3fbcfb15b899a44123b34b6dcc18b724336a2cae"
+  integrity sha1-P7z7FbiZpEEjs0ttzBi3JDNqLK4=
+
+p-limit@^1.1.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-1.3.0.tgz#b86bd5f0c25690911c7590fcbfc2010d54b3ccb8"
+  integrity sha512-vvcXsLAJ9Dr5rQOPk7toZQZJApBl2K4J6dANSsEuh6QI41JYcsS/qhTGa9ErIUUgK3WNQoJYvylxvjqmiqEA9Q==
+  dependencies:
+    p-try "^1.0.0"
+
+p-limit@^2.0.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-2.2.0.tgz#417c9941e6027a9abcba5092dd2904e255b5fbc2"
+  integrity sha512-pZbTJpoUsCzV48Mc9Nh51VbwO0X9cuPFE8gYwx9BTCt9SF8/b7Zljd2fVgOxhIF/HDTKgpVzs+GPhyKfjLLFRQ==
+  dependencies:
+    p-try "^2.0.0"
+
+p-locate@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/p-locate/-/p-locate-2.0.0.tgz#20a0103b222a70c8fd39cc2e580680f3dde5ec43"
+  integrity sha1-IKAQOyIqcMj9OcwuWAaA893l7EM=
+  dependencies:
+    p-limit "^1.1.0"
+
+p-locate@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/p-locate/-/p-locate-3.0.0.tgz#322d69a05c0264b25997d9f40cd8a891ab0064a4"
+  integrity sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==
+  dependencies:
+    p-limit "^2.0.0"
+
+p-map@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/p-map/-/p-map-2.1.0.tgz#310928feef9c9ecc65b68b17693018a665cea175"
+  integrity sha512-y3b8Kpd8OAN444hxfBbFfj1FY/RjtTd8tzYwhUqNYXx0fXx2iX4maP4Qr6qhIKbQXI02wTLAda4fYUbDagTUFw==
+
+p-try@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/p-try/-/p-try-1.0.0.tgz#cbc79cdbaf8fd4228e13f621f2b1a237c1b207b3"
+  integrity sha1-y8ec26+P1CKOE/Yh8rGiN8GyB7M=
+
+p-try@^2.0.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/p-try/-/p-try-2.2.0.tgz#cb2868540e313d61de58fafbe35ce9004d5540e6"
+  integrity sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==
+
+package-hash@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/package-hash/-/package-hash-3.0.0.tgz#50183f2d36c9e3e528ea0a8605dff57ce976f88e"
+  integrity sha512-lOtmukMDVvtkL84rJHI7dpTYq+0rli8N2wlnqUcBuDWCfVhRUfOmnR9SsoHFMLpACvEV60dX7rd0rFaYDZI+FA==
+  dependencies:
+    graceful-fs "^4.1.15"
+    hasha "^3.0.0"
+    lodash.flattendeep "^4.4.0"
+    release-zalgo "^1.0.0"
+
+package-json@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/package-json/-/package-json-4.0.1.tgz#8869a0401253661c4c4ca3da6c2121ed555f5eed"
+  integrity sha1-iGmgQBJTZhxMTKPabCEh7VVfXu0=
+  dependencies:
+    got "^6.7.1"
+    registry-auth-token "^3.0.1"
+    registry-url "^3.0.3"
+    semver "^5.1.0"
+
+parse-json@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-4.0.0.tgz#be35f5425be1f7f6c747184f98a788cb99477ee0"
+  integrity sha1-vjX1Qlvh9/bHRxhPmKeIy5lHfuA=
+  dependencies:
+    error-ex "^1.3.1"
+    json-parse-better-errors "^1.0.1"
+
+parse-ms@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/parse-ms/-/parse-ms-2.1.0.tgz#348565a753d4391fa524029956b172cb7753097d"
+  integrity sha512-kHt7kzLoS9VBZfUsiKjv43mr91ea+U05EyKkEtqp7vNbHxmaVuEqN7XxeEVnGrMtYOAxGrDElSi96K7EgO1zCA==
+
+pascalcase@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/pascalcase/-/pascalcase-0.1.1.tgz#b363e55e8006ca6fe21784d2db22bd15d7917f14"
+  integrity sha1-s2PlXoAGym/iF4TS2yK9FdeRfxQ=
+
+path-dirname@^1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/path-dirname/-/path-dirname-1.0.2.tgz#cc33d24d525e099a5388c0336c6e32b9160609e0"
+  integrity sha1-zDPSTVJeCZpTiMAzbG4yuRYGCeA=
+
+path-exists@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/path-exists/-/path-exists-3.0.0.tgz#ce0ebeaa5f78cb18925ea7d810d7b59b010fd515"
+  integrity sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=
+
+path-is-absolute@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/path-is-absolute/-/path-is-absolute-1.0.1.tgz#174b9268735534ffbc7ace6bf53a5a9e1b5c5f5f"
+  integrity sha1-F0uSaHNVNP+8es5r9TpanhtcX18=
+
+path-is-inside@^1.0.1, path-is-inside@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/path-is-inside/-/path-is-inside-1.0.2.tgz#365417dede44430d1c11af61027facf074bdfc53"
+  integrity sha1-NlQX3t5EQw0cEa9hAn+s8HS9/FM=
+
+path-key@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/path-key/-/path-key-2.0.1.tgz#411cadb574c5a140d3a4b1910d40d80cc9f40b40"
+  integrity sha1-QRyttXTFoUDTpLGRDUDYDMn0C0A=
+
+path-parse@^1.0.6:
+  version "1.0.6"
+  resolved "https://registry.yarnpkg.com/path-parse/-/path-parse-1.0.6.tgz#d62dbb5679405d72c4737ec58600e9ddcf06d24c"
+  integrity sha512-GSmOT2EbHrINBf9SR7CDELwlJ8AENk3Qn7OikK4nFYAu3Ote2+JYNVvkpAEQm3/TLNEJFD/xZJjzyxg3KBWOzw==
+
+path-type@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/path-type/-/path-type-3.0.0.tgz#cef31dc8e0a1a3bb0d105c0cd97cf3bf47f4e36f"
+  integrity sha512-T2ZUsdZFHgA3u4e5PfPbjd7HDDpxPnQb5jN0SrDsjNSuVXHJqtwTnWqG0B1jZrgmJ/7lj1EmVIByWt1gxGkWvg==
+  dependencies:
+    pify "^3.0.0"
+
+performance-now@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
+  integrity sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=
+
+pify@^2.0.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/pify/-/pify-2.3.0.tgz#ed141a6ac043a849ea588498e7dca8b15330e90c"
+  integrity sha1-7RQaasBDqEnqWISY59yosVMw6Qw=
+
+pify@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/pify/-/pify-3.0.0.tgz#e5a4acd2c101fdf3d9a4d07f0dbc4db49dd28176"
+  integrity sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=
+
+pify@^4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/pify/-/pify-4.0.1.tgz#4b2cd25c50d598735c50292224fd8c6df41e3231"
+  integrity sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==
+
+pinkie-promise@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/pinkie-promise/-/pinkie-promise-2.0.1.tgz#2135d6dfa7a358c069ac9b178776288228450ffa"
+  integrity sha1-ITXW36ejWMBprJsXh3YogihFD/o=
+  dependencies:
+    pinkie "^2.0.0"
+
+pinkie@^2.0.0:
+  version "2.0.4"
+  resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
+  integrity sha1-clVrgM+g1IqXToDnckjoDtT3+HA=
+
+pkg-conf@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/pkg-conf/-/pkg-conf-3.1.0.tgz#d9f9c75ea1bae0e77938cde045b276dac7cc69ae"
+  integrity sha512-m0OTbR/5VPNPqO1ph6Fqbj7Hv6QU7gR/tQW40ZqrL1rjgCU85W6C1bJn0BItuJqnR98PWzw7Z8hHeChD1WrgdQ==
+  dependencies:
+    find-up "^3.0.0"
+    load-json-file "^5.2.0"
+
+pkg-dir@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/pkg-dir/-/pkg-dir-3.0.0.tgz#2749020f239ed990881b1f71210d51eb6523bea3"
+  integrity sha512-/E57AYkoeQ25qkxMj5PBOVgF8Kiu/h7cYS30Z5+R7WaiCCBfLq58ZI/dSeaEKb9WVJV5n/03QwrN3IeWIFllvw==
+  dependencies:
+    find-up "^3.0.0"
+
+plur@^3.0.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/plur/-/plur-3.1.1.tgz#60267967866a8d811504fe58f2faaba237546a5b"
+  integrity sha512-t1Ax8KUvV3FFII8ltczPn2tJdjqbd1sIzu6t4JL7nQ3EyeL/lTrj5PWKb06ic5/6XYDr65rQ4uzQEGN70/6X5w==
+  dependencies:
+    irregular-plurals "^2.0.0"
+
+posix-character-classes@^0.1.0:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/posix-character-classes/-/posix-character-classes-0.1.1.tgz#01eac0fe3b5af71a2a6c02feabb8c1fef7e00eab"
+  integrity sha1-AerA/jta9xoqbAL+q7jB/vfgDqs=
+
+prepend-http@^1.0.1:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-1.0.4.tgz#d4f4562b0ce3696e41ac52d0e002e57a635dc6dc"
+  integrity sha1-1PRWKwzjaW5BrFLQ4ALlemNdxtw=
+
+pretty-ms@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/pretty-ms/-/pretty-ms-4.0.0.tgz#31baf41b94fd02227098aaa03bd62608eb0d6e92"
+  integrity sha512-qG66ahoLCwpLXD09ZPHSCbUWYTqdosB7SMP4OffgTgL2PBKXMuUsrk5Bwg8q4qPkjTXsKBMr+YK3Ltd/6F9s/Q==
+  dependencies:
+    parse-ms "^2.0.0"
+
+process-nextick-args@~2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-2.0.0.tgz#a37d732f4271b4ab1ad070d35508e8290788ffaa"
+  integrity sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==
+
+pseudomap@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/pseudomap/-/pseudomap-1.0.2.tgz#f052a28da70e618917ef0a8ac34c1ae5a68286b3"
+  integrity sha1-8FKijacOYYkX7wqKw0wa5aaChrM=
+
+psl@^1.1.24:
+  version "1.1.31"
+  resolved "https://registry.yarnpkg.com/psl/-/psl-1.1.31.tgz#e9aa86d0101b5b105cbe93ac6b784cd547276184"
+  integrity sha512-/6pt4+C+T+wZUieKR620OpzN/LlnNKuWjy1iFLQ/UG35JqHlR/89MP1d96dUfkf6Dne3TuLQzOYEYshJ+Hx8mw==
+
+punycode@^1.4.1:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/punycode/-/punycode-1.4.1.tgz#c0d5a63b2718800ad8e1eb0fa5269c84dd41845e"
+  integrity sha1-wNWmOycYgArY4esPpSachN1BhF4=
+
+punycode@^2.1.0:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
+  integrity sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==
+
+qs@~6.5.2:
+  version "6.5.2"
+  resolved "https://registry.yarnpkg.com/qs/-/qs-6.5.2.tgz#cb3ae806e8740444584ef154ce8ee98d403f3e36"
+  integrity sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==
+
+quick-lru@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/quick-lru/-/quick-lru-1.1.0.tgz#4360b17c61136ad38078397ff11416e186dcfbb8"
+  integrity sha1-Q2CxfGETatOAeDl/8RQW4Ybc+7g=
+
+rc@^1.0.1, rc@^1.1.6, rc@^1.2.7:
+  version "1.2.8"
+  resolved "https://registry.yarnpkg.com/rc/-/rc-1.2.8.tgz#cd924bf5200a075b83c188cd6b9e211b7fc0d3ed"
+  integrity sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==
+  dependencies:
+    deep-extend "^0.6.0"
+    ini "~1.3.0"
+    minimist "^1.2.0"
+    strip-json-comments "~2.0.1"
+
+read-pkg-up@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/read-pkg-up/-/read-pkg-up-3.0.0.tgz#3ed496685dba0f8fe118d0691dc51f4a1ff96f07"
+  integrity sha1-PtSWaF26D4/hGNBpHcUfSh/5bwc=
+  dependencies:
+    find-up "^2.0.0"
+    read-pkg "^3.0.0"
+
+read-pkg@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/read-pkg/-/read-pkg-3.0.0.tgz#9cbc686978fee65d16c00e2b19c237fcf6e38389"
+  integrity sha1-nLxoaXj+5l0WwA4rGcI3/Pbjg4k=
+  dependencies:
+    load-json-file "^4.0.0"
+    normalize-package-data "^2.3.2"
+    path-type "^3.0.0"
+
+readable-stream@^2.0.2, readable-stream@^2.0.6:
+  version "2.3.6"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
+  integrity sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==
+  dependencies:
+    core-util-is "~1.0.0"
+    inherits "~2.0.3"
+    isarray "~1.0.0"
+    process-nextick-args "~2.0.0"
+    safe-buffer "~5.1.1"
+    string_decoder "~1.1.1"
+    util-deprecate "~1.0.1"
+
+readdirp@^2.2.1:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/readdirp/-/readdirp-2.2.1.tgz#0e87622a3325aa33e892285caf8b4e846529a525"
+  integrity sha512-1JU/8q+VgFZyxwrJ+SVIOsh+KywWGpds3NTqikiKpDMZWScmAYyKIgqkO+ARvNWJfXeXR1zxz7aHF4u4CyH6vQ==
+  dependencies:
+    graceful-fs "^4.1.11"
+    micromatch "^3.1.10"
+    readable-stream "^2.0.2"
+
+redent@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/redent/-/redent-2.0.0.tgz#c1b2007b42d57eb1389079b3c8333639d5e1ccaa"
+  integrity sha1-wbIAe0LVfrE4kHmzyDM2OdXhzKo=
+  dependencies:
+    indent-string "^3.0.0"
+    strip-indent "^2.0.0"
+
+regenerate-unicode-properties@^8.0.2:
+  version "8.1.0"
+  resolved "https://registry.yarnpkg.com/regenerate-unicode-properties/-/regenerate-unicode-properties-8.1.0.tgz#ef51e0f0ea4ad424b77bf7cb41f3e015c70a3f0e"
+  integrity sha512-LGZzkgtLY79GeXLm8Dp0BVLdQlWICzBnJz/ipWUgo59qBaZ+BHtq51P2q1uVZlppMuUAT37SDk39qUbjTWB7bA==
+  dependencies:
+    regenerate "^1.4.0"
+
+regenerate@^1.4.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/regenerate/-/regenerate-1.4.0.tgz#4a856ec4b56e4077c557589cae85e7a4c8869a11"
+  integrity sha512-1G6jJVDWrt0rK99kBjvEtziZNCICAuvIPkSiUFIQxVP06RCVpq3dmDo2oi6ABpYaDYaTRr67BEhL8r1wgEZZKg==
+
+regex-not@^1.0.0, regex-not@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/regex-not/-/regex-not-1.0.2.tgz#1f4ece27e00b0b65e0247a6810e6a85d83a5752c"
+  integrity sha512-J6SDjUgDxQj5NusnOtdFxDwN/+HWykR8GELwctJ7mdqhcyy1xEc4SRFHUXvxTp661YaVKAjfRLZ9cCqS6tn32A==
+  dependencies:
+    extend-shallow "^3.0.2"
+    safe-regex "^1.1.0"
+
+regexpu-core@^4.5.4:
+  version "4.5.4"
+  resolved "https://registry.yarnpkg.com/regexpu-core/-/regexpu-core-4.5.4.tgz#080d9d02289aa87fe1667a4f5136bc98a6aebaae"
+  integrity sha512-BtizvGtFQKGPUcTy56o3nk1bGRp4SZOTYrDtGNlqCQufptV5IkkLN6Emw+yunAJjzf+C9FQFtvq7IoA3+oMYHQ==
+  dependencies:
+    regenerate "^1.4.0"
+    regenerate-unicode-properties "^8.0.2"
+    regjsgen "^0.5.0"
+    regjsparser "^0.6.0"
+    unicode-match-property-ecmascript "^1.0.4"
+    unicode-match-property-value-ecmascript "^1.1.0"
+
+registry-auth-token@^3.0.1:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/registry-auth-token/-/registry-auth-token-3.4.0.tgz#d7446815433f5d5ed6431cd5dca21048f66b397e"
+  integrity sha512-4LM6Fw8eBQdwMYcES4yTnn2TqIasbXuwDx3um+QRs7S55aMKCBKBxvPXl2RiUjHwuJLTyYfxSpmfSAjQpcuP+A==
+  dependencies:
+    rc "^1.1.6"
+    safe-buffer "^5.0.1"
+
+registry-url@^3.0.3:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/registry-url/-/registry-url-3.1.0.tgz#3d4ef870f73dde1d77f0cf9a381432444e174942"
+  integrity sha1-PU74cPc93h138M+aOBQyRE4XSUI=
+  dependencies:
+    rc "^1.0.1"
+
+regjsgen@^0.5.0:
+  version "0.5.0"
+  resolved "https://registry.yarnpkg.com/regjsgen/-/regjsgen-0.5.0.tgz#a7634dc08f89209c2049adda3525711fb97265dd"
+  integrity sha512-RnIrLhrXCX5ow/E5/Mh2O4e/oa1/jW0eaBKTSy3LaCj+M3Bqvm97GWDp2yUtzIs4LEn65zR2yiYGFqb2ApnzDA==
+
+regjsparser@^0.6.0:
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/regjsparser/-/regjsparser-0.6.0.tgz#f1e6ae8b7da2bae96c99399b868cd6c933a2ba9c"
+  integrity sha512-RQ7YyokLiQBomUJuUG8iGVvkgOLxwyZM8k6d3q5SAXpg4r5TZJZigKFvC6PpD+qQ98bCDC5YelPeA3EucDoNeQ==
+  dependencies:
+    jsesc "~0.5.0"
+
+release-zalgo@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/release-zalgo/-/release-zalgo-1.0.0.tgz#09700b7e5074329739330e535c5a90fb67851730"
+  integrity sha1-CXALflB0Mpc5Mw5TXFqQ+2eFFzA=
+  dependencies:
+    es6-error "^4.0.1"
+
+remove-trailing-separator@^1.0.1:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz#c24bce2a283adad5bc3f58e0d48249b92379d8ef"
+  integrity sha1-wkvOKig62tW8P1jg1IJJuSN52O8=
+
+repeat-element@^1.1.2:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/repeat-element/-/repeat-element-1.1.3.tgz#782e0d825c0c5a3bb39731f84efee6b742e6b1ce"
+  integrity sha512-ahGq0ZnV5m5XtZLMb+vP76kcAM5nkLqk0lpqAuojSKGgQtn4eRi4ZZGm2olo2zKFH+sMsWaqOCW1dqAnOru72g==
+
+repeat-string@^1.6.1:
+  version "1.6.1"
+  resolved "https://registry.yarnpkg.com/repeat-string/-/repeat-string-1.6.1.tgz#8dcae470e1c88abc2d600fff4a776286da75e637"
+  integrity sha1-jcrkcOHIirwtYA//Sndihtp15jc=
+
+request@^2.87.0:
+  version "2.88.0"
+  resolved "https://registry.yarnpkg.com/request/-/request-2.88.0.tgz#9c2fca4f7d35b592efe57c7f0a55e81052124fef"
+  integrity sha512-NAqBSrijGLZdM0WZNsInLJpkJokL72XYjUpnB0iwsRgxh7dB6COrHnTBNwN0E+lHDAJzu7kLAkDeY08z2/A0hg==
+  dependencies:
+    aws-sign2 "~0.7.0"
+    aws4 "^1.8.0"
+    caseless "~0.12.0"
+    combined-stream "~1.0.6"
+    extend "~3.0.2"
+    forever-agent "~0.6.1"
+    form-data "~2.3.2"
+    har-validator "~5.1.0"
+    http-signature "~1.2.0"
+    is-typedarray "~1.0.0"
+    isstream "~0.1.2"
+    json-stringify-safe "~5.0.1"
+    mime-types "~2.1.19"
+    oauth-sign "~0.9.0"
+    performance-now "^2.1.0"
+    qs "~6.5.2"
+    safe-buffer "^5.1.2"
+    tough-cookie "~2.4.3"
+    tunnel-agent "^0.6.0"
+    uuid "^3.3.2"
+
+require-precompiled@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/require-precompiled/-/require-precompiled-0.1.0.tgz#5a1b52eb70ebed43eb982e974c85ab59571e56fa"
+  integrity sha1-WhtS63Dr7UPrmC6XTIWrWVceVvo=
+
+resolve-cwd@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/resolve-cwd/-/resolve-cwd-2.0.0.tgz#00a9f7387556e27038eae232caa372a6a59b665a"
+  integrity sha1-AKn3OHVW4nA46uIyyqNypqWbZlo=
+  dependencies:
+    resolve-from "^3.0.0"
+
+resolve-from@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-3.0.0.tgz#b22c7af7d9d6881bc8b6e653335eebcb0a188748"
+  integrity sha1-six699nWiBvItuZTM17rywoYh0g=
+
+resolve-url@^0.2.1:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
+  integrity sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=
+
+resolve@^1.10.0, resolve@^1.3.2:
+  version "1.11.0"
+  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.11.0.tgz#4014870ba296176b86343d50b60f3b50609ce232"
+  integrity sha512-WL2pBDjqT6pGUNSUzMw00o4T7If+z4H2x3Gz893WoUQ5KW8Vr9txp00ykiP16VBaZF5+j/OcXJHZ9+PCvdiDKw==
+  dependencies:
+    path-parse "^1.0.6"
+
+restore-cursor@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/restore-cursor/-/restore-cursor-2.0.0.tgz#9f7ee287f82fd326d4fd162923d62129eee0dfaf"
+  integrity sha1-n37ih/gv0ybU/RYpI9YhKe7g368=
+  dependencies:
+    onetime "^2.0.0"
+    signal-exit "^3.0.2"
+
+ret@~0.1.10:
+  version "0.1.15"
+  resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
+  integrity sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg==
+
+rimraf@^2.6.1, rimraf@^2.6.3:
+  version "2.6.3"
+  resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.6.3.tgz#b2d104fe0d8fb27cf9e0a1cda8262dd3833c6cab"
+  integrity sha512-mwqeW5XsA2qAejG46gYdENaxXjx9onRNCfn7L0duuP4hCuTIi/QO7PDK07KJfp1d+izWPrzEJDcSqBa0OZQriA==
+  dependencies:
+    glob "^7.1.3"
+
+safe-buffer@^5.0.1, safe-buffer@^5.1.2, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
+  integrity sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==
+
+safe-regex@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/safe-regex/-/safe-regex-1.1.0.tgz#40a3669f3b077d1e943d44629e157dd48023bf2e"
+  integrity sha1-QKNmnzsHfR6UPURinhV91IAjvy4=
+  dependencies:
+    ret "~0.1.10"
+
+"safer-buffer@>= 2.1.2 < 3", safer-buffer@^2.0.2, safer-buffer@^2.1.0, safer-buffer@~2.1.0:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
+  integrity sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==
+
+sax@^1.2.4:
+  version "1.2.4"
+  resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
+  integrity sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==
+
+semver-diff@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/semver-diff/-/semver-diff-2.1.0.tgz#4bbb8437c8d37e4b0cf1a68fd726ec6d645d6d36"
+  integrity sha1-S7uEN8jTfksM8aaP1ybsbWRdbTY=
+  dependencies:
+    semver "^5.0.3"
+
+"semver@2 || 3 || 4 || 5", semver@^5.0.3, semver@^5.1.0, semver@^5.3.0, semver@^5.4.1, semver@^5.5.1, semver@^5.6.0:
+  version "5.7.0"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.0.tgz#790a7cf6fea5459bac96110b29b60412dc8ff96b"
+  integrity sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==
+
+serialize-error@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/serialize-error/-/serialize-error-2.1.0.tgz#50b679d5635cdf84667bdc8e59af4e5b81d5f60a"
+  integrity sha1-ULZ51WNc34Rme9yOWa9OW4HV9go=
+
+set-blocking@~2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/set-blocking/-/set-blocking-2.0.0.tgz#045f9782d011ae9a6803ddd382b24392b3d890f7"
+  integrity sha1-BF+XgtARrppoA93TgrJDkrPYkPc=
+
+set-value@^0.4.3:
+  version "0.4.3"
+  resolved "https://registry.yarnpkg.com/set-value/-/set-value-0.4.3.tgz#7db08f9d3d22dc7f78e53af3c3bf4666ecdfccf1"
+  integrity sha1-fbCPnT0i3H945Trzw79GZuzfzPE=
+  dependencies:
+    extend-shallow "^2.0.1"
+    is-extendable "^0.1.1"
+    is-plain-object "^2.0.1"
+    to-object-path "^0.3.0"
+
+set-value@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/set-value/-/set-value-2.0.0.tgz#71ae4a88f0feefbbf52d1ea604f3fb315ebb6274"
+  integrity sha512-hw0yxk9GT/Hr5yJEYnHNKYXkIA8mVJgd9ditYZCe16ZczcaELYYcfvaXesNACk2O8O0nTiPQcQhGUQj8JLzeeg==
+  dependencies:
+    extend-shallow "^2.0.1"
+    is-extendable "^0.1.1"
+    is-plain-object "^2.0.3"
+    split-string "^3.0.1"
+
+shebang-command@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/shebang-command/-/shebang-command-1.2.0.tgz#44aac65b695b03398968c39f363fee5deafdf1ea"
+  integrity sha1-RKrGW2lbAzmJaMOfNj/uXer98eo=
+  dependencies:
+    shebang-regex "^1.0.0"
+
+shebang-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-1.0.0.tgz#da42f49740c0b42db2ca9728571cb190c98efea3"
+  integrity sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=
+
+signal-exit@^3.0.0, signal-exit@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
+  integrity sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=
+
+slash@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/slash/-/slash-1.0.0.tgz#c41f2f6c39fc16d1cd17ad4b5d896114ae470d55"
+  integrity sha1-xB8vbDn8FtHNF61LXYlhFK5HDVU=
+
+slash@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/slash/-/slash-2.0.0.tgz#de552851a1759df3a8f206535442f5ec4ddeab44"
+  integrity sha512-ZYKh3Wh2z1PpEXWr0MpSBZ0V6mZHAQfYevttO11c51CaWjGTaadiKZ+wVt1PbMlDV5qhMFslpZCemhwOK7C89A==
+
+slice-ansi@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/slice-ansi/-/slice-ansi-1.0.0.tgz#044f1a49d8842ff307aad6b505ed178bd950134d"
+  integrity sha512-POqxBK6Lb3q6s047D/XsDVNPnF9Dl8JSaqe9h9lURl0OdNqy/ujDrOiIHtsqXMGbWWTIomRzAMaTyawAU//Reg==
+  dependencies:
+    is-fullwidth-code-point "^2.0.0"
+
+slide@^1.1.5:
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/slide/-/slide-1.1.6.tgz#56eb027d65b4d2dce6cb2e2d32c4d4afc9e1d707"
+  integrity sha1-VusCfWW00tzmyy4tMsTUr8nh1wc=
+
+snapdragon-node@^2.0.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/snapdragon-node/-/snapdragon-node-2.1.1.tgz#6c175f86ff14bdb0724563e8f3c1b021a286853b"
+  integrity sha512-O27l4xaMYt/RSQ5TR3vpWCAB5Kb/czIcqUFOM/C4fYcLnbZUc1PkjTAMjof2pBWaSTwOUd6qUHcFGVGj7aIwnw==
+  dependencies:
+    define-property "^1.0.0"
+    isobject "^3.0.0"
+    snapdragon-util "^3.0.1"
+
+snapdragon-util@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/snapdragon-util/-/snapdragon-util-3.0.1.tgz#f956479486f2acd79700693f6f7b805e45ab56e2"
+  integrity sha512-mbKkMdQKsjX4BAL4bRYTj21edOf8cN7XHdYUJEe+Zn99hVEYcMvKPct1IqNe7+AZPirn8BCDOQBHQZknqmKlZQ==
+  dependencies:
+    kind-of "^3.2.0"
+
+snapdragon@^0.8.1:
+  version "0.8.2"
+  resolved "https://registry.yarnpkg.com/snapdragon/-/snapdragon-0.8.2.tgz#64922e7c565b0e14204ba1aa7d6964278d25182d"
+  integrity sha512-FtyOnWN/wCHTVXOMwvSv26d+ko5vWlIDD6zoUJ7LW8vh+ZBC8QdljveRP+crNrtBwioEUWy/4dMtbBjA4ioNlg==
+  dependencies:
+    base "^0.11.1"
+    debug "^2.2.0"
+    define-property "^0.2.5"
+    extend-shallow "^2.0.1"
+    map-cache "^0.2.2"
+    source-map "^0.5.6"
+    source-map-resolve "^0.5.0"
+    use "^3.1.0"
+
+source-map-resolve@^0.5.0:
+  version "0.5.2"
+  resolved "https://registry.yarnpkg.com/source-map-resolve/-/source-map-resolve-0.5.2.tgz#72e2cc34095543e43b2c62b2c4c10d4a9054f259"
+  integrity sha512-MjqsvNwyz1s0k81Goz/9vRBe9SZdB09Bdw+/zYyO+3CuPk6fouTaxscHkgtE8jKvf01kVfl8riHzERQ/kefaSA==
+  dependencies:
+    atob "^2.1.1"
+    decode-uri-component "^0.2.0"
+    resolve-url "^0.2.1"
+    source-map-url "^0.4.0"
+    urix "^0.1.0"
+
+source-map-support@^0.5.11:
+  version "0.5.12"
+  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.12.tgz#b4f3b10d51857a5af0138d3ce8003b201613d599"
+  integrity sha512-4h2Pbvyy15EE02G+JOZpUCmqWJuqrs+sEkzewTm++BPi7Hvn/HwcqLAcNxYAyI0x13CpPPn+kMjl+hplXMHITQ==
+  dependencies:
+    buffer-from "^1.0.0"
+    source-map "^0.6.0"
+
+source-map-url@^0.4.0:
+  version "0.4.0"
+  resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.0.tgz#3e935d7ddd73631b97659956d55128e87b5084a3"
+  integrity sha1-PpNdfd1zYxuXZZlW1VEo6HtQhKM=
+
+source-map@^0.5.0, source-map@^0.5.6:
+  version "0.5.7"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
+  integrity sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=
+
+source-map@^0.6.0:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
+  integrity sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==
+
+spdx-correct@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/spdx-correct/-/spdx-correct-3.1.0.tgz#fb83e504445268f154b074e218c87c003cd31df4"
+  integrity sha512-lr2EZCctC2BNR7j7WzJ2FpDznxky1sjfxvvYEyzxNyb6lZXHODmEoJeFu4JupYlkfha1KZpJyoqiJ7pgA1qq8Q==
+  dependencies:
+    spdx-expression-parse "^3.0.0"
+    spdx-license-ids "^3.0.0"
+
+spdx-exceptions@^2.1.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/spdx-exceptions/-/spdx-exceptions-2.2.0.tgz#2ea450aee74f2a89bfb94519c07fcd6f41322977"
+  integrity sha512-2XQACfElKi9SlVb1CYadKDXvoajPgBVPn/gOQLrTvHdElaVhr7ZEbqJaRnJLVNeaI4cMEAgVCeBMKF6MWRDCRA==
+
+spdx-expression-parse@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/spdx-expression-parse/-/spdx-expression-parse-3.0.0.tgz#99e119b7a5da00e05491c9fa338b7904823b41d0"
+  integrity sha512-Yg6D3XpRD4kkOmTpdgbUiEJFKghJH03fiC1OPll5h/0sO6neh2jqRDVHOQ4o/LMea0tgCkbMgea5ip/e+MkWyg==
+  dependencies:
+    spdx-exceptions "^2.1.0"
+    spdx-license-ids "^3.0.0"
+
+spdx-license-ids@^3.0.0:
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/spdx-license-ids/-/spdx-license-ids-3.0.4.tgz#75ecd1a88de8c184ef015eafb51b5b48bfd11bb1"
+  integrity sha512-7j8LYJLeY/Yb6ACbQ7F76qy5jHkp0U6jgBfJsk97bwWlVUnUWsAgpyaCvo17h0/RQGnQ036tVDomiwoI4pDkQA==
+
+split-string@^3.0.1, split-string@^3.0.2:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/split-string/-/split-string-3.1.0.tgz#7cb09dda3a86585705c64b39a6466038682e8fe2"
+  integrity sha512-NzNVhJDYpwceVVii8/Hu6DKfD2G+NrQHlS/V/qgv763EYudVwEcMQNxd2lh+0VrUByXN/oJkl5grOhYWvQUYiw==
+  dependencies:
+    extend-shallow "^3.0.0"
+
+sprintf-js@~1.0.2:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
+  integrity sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=
+
+sqlite3@^4.0.8:
+  version "4.0.8"
+  resolved "https://registry.yarnpkg.com/sqlite3/-/sqlite3-4.0.8.tgz#81ee60d54befaa52f5421fe6337050bd43d4bb95"
+  integrity sha512-kgwHu4j10KhpCHtx//dejd/tVQot7jc3sw+Sn0vMuKOw0X00Ckyg9VceKgzPyGmmz+zEoYue9tOLriWTvYy0ww==
+  dependencies:
+    nan "^2.12.1"
+    node-pre-gyp "^0.11.0"
+    request "^2.87.0"
+
+sshpk@^1.7.0:
+  version "1.16.1"
+  resolved "https://registry.yarnpkg.com/sshpk/-/sshpk-1.16.1.tgz#fb661c0bef29b39db40769ee39fa70093d6f6877"
+  integrity sha512-HXXqVUq7+pcKeLqqZj6mHFUMvXtOJt1uoUx09pFW6011inTMxqI8BA8PM95myrIyyKwdnzjdFjLiE6KBPVtJIg==
+  dependencies:
+    asn1 "~0.2.3"
+    assert-plus "^1.0.0"
+    bcrypt-pbkdf "^1.0.0"
+    dashdash "^1.12.0"
+    ecc-jsbn "~0.1.1"
+    getpass "^0.1.1"
+    jsbn "~0.1.0"
+    safer-buffer "^2.0.2"
+    tweetnacl "~0.14.0"
+
+stack-utils@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/stack-utils/-/stack-utils-1.0.2.tgz#33eba3897788558bebfc2db059dc158ec36cebb8"
+  integrity sha512-MTX+MeG5U994cazkjd/9KNAapsHnibjMLnfXodlkXw76JEea0UiNzrqidzo1emMwk7w5Qhc9jd4Bn9TBb1MFwA==
+
+static-extend@^0.1.1:
+  version "0.1.2"
+  resolved "https://registry.yarnpkg.com/static-extend/-/static-extend-0.1.2.tgz#60809c39cbff55337226fd5e0b520f341f1fb5c6"
+  integrity sha1-YICcOcv/VTNyJv1eC1IPNB8ftcY=
+  dependencies:
+    define-property "^0.2.5"
+    object-copy "^0.1.0"
+
+string-width@^1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/string-width/-/string-width-1.0.2.tgz#118bdf5b8cdc51a2a7e70d211e07e2b0b9b107d3"
+  integrity sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=
+  dependencies:
+    code-point-at "^1.0.0"
+    is-fullwidth-code-point "^1.0.0"
+    strip-ansi "^3.0.0"
+
+"string-width@^1.0.2 || 2", string-width@^2.0.0, string-width@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/string-width/-/string-width-2.1.1.tgz#ab93f27a8dc13d28cac815c462143a6d9012ae9e"
+  integrity sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==
+  dependencies:
+    is-fullwidth-code-point "^2.0.0"
+    strip-ansi "^4.0.0"
+
+string_decoder@~1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-1.1.1.tgz#9cf1611ba62685d7030ae9e4ba34149c3af03fc8"
+  integrity sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==
+  dependencies:
+    safe-buffer "~5.1.0"
+
+strip-ansi@^3.0.0, strip-ansi@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-3.0.1.tgz#6a385fb8853d952d5ff05d0e8aaf94278dc63dcf"
+  integrity sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=
+  dependencies:
+    ansi-regex "^2.0.0"
+
+strip-ansi@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-4.0.0.tgz#a8479022eb1ac368a871389b635262c505ee368f"
+  integrity sha1-qEeQIusaw2iocTibY1JixQXuNo8=
+  dependencies:
+    ansi-regex "^3.0.0"
+
+strip-ansi@^5.2.0:
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-5.2.0.tgz#8c9a536feb6afc962bdfa5b104a5091c1ad9c0ae"
+  integrity sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==
+  dependencies:
+    ansi-regex "^4.1.0"
+
+strip-bom-buf@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/strip-bom-buf/-/strip-bom-buf-1.0.0.tgz#1cb45aaf57530f4caf86c7f75179d2c9a51dd572"
+  integrity sha1-HLRar1dTD0yvhsf3UXnSyaUd1XI=
+  dependencies:
+    is-utf8 "^0.2.1"
+
+strip-bom@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/strip-bom/-/strip-bom-3.0.0.tgz#2334c18e9c759f7bdd56fdef7e9ae3d588e68ed3"
+  integrity sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=
+
+strip-eof@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/strip-eof/-/strip-eof-1.0.0.tgz#bb43ff5598a6eb05d89b59fcd129c983313606bf"
+  integrity sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=
+
+strip-indent@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/strip-indent/-/strip-indent-2.0.0.tgz#5ef8db295d01e6ed6cbf7aab96998d7822527b68"
+  integrity sha1-XvjbKV0B5u1sv3qrlpmNeCJSe2g=
+
+strip-json-comments@~2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
+  integrity sha1-PFMZQukIwml8DsNEhYwobHygpgo=
+
+supertap@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/supertap/-/supertap-1.0.0.tgz#bd9751c7fafd68c68cf8222a29892206a119fa9e"
+  integrity sha512-HZJ3geIMPgVwKk2VsmO5YHqnnJYl6bV5A9JW2uzqV43WmpgliNEYbuvukfor7URpaqpxuw3CfZ3ONdVbZjCgIA==
+  dependencies:
+    arrify "^1.0.1"
+    indent-string "^3.2.0"
+    js-yaml "^3.10.0"
+    serialize-error "^2.1.0"
+    strip-ansi "^4.0.0"
+
+supports-color@^5.3.0:
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.5.0.tgz#e2e69a44ac8772f78a1ec0b35b689df6530efc8f"
+  integrity sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==
+  dependencies:
+    has-flag "^3.0.0"
+
+supports-color@^6.1.0:
+  version "6.1.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-6.1.0.tgz#0764abc69c63d5ac842dd4867e8d025e880df8f3"
+  integrity sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==
+  dependencies:
+    has-flag "^3.0.0"
+
+symbol-observable@^0.2.2:
+  version "0.2.4"
+  resolved "https://registry.yarnpkg.com/symbol-observable/-/symbol-observable-0.2.4.tgz#95a83db26186d6af7e7a18dbd9760a2f86d08f40"
+  integrity sha1-lag9smGG1q9+ehjb2XYKL4bQj0A=
+
+symbol-observable@^1.0.4, symbol-observable@^1.1.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/symbol-observable/-/symbol-observable-1.2.0.tgz#c22688aed4eab3cdc2dfeacbb561660560a00804"
+  integrity sha512-e900nM8RRtGhlV36KGEU9k65K3mPb1WV70OdjfxlG2EAuM1noi/E/BaW/uMhL7bPEssK8QV57vN3esixjUvcXQ==
+
+tar@^4:
+  version "4.4.8"
+  resolved "https://registry.yarnpkg.com/tar/-/tar-4.4.8.tgz#b19eec3fde2a96e64666df9fdb40c5ca1bc3747d"
+  integrity sha512-LzHF64s5chPQQS0IYBn9IN5h3i98c12bo4NCO7e0sGM2llXQ3p2FGC5sdENN4cTW48O915Sh+x+EXx7XW96xYQ==
+  dependencies:
+    chownr "^1.1.1"
+    fs-minipass "^1.2.5"
+    minipass "^2.3.4"
+    minizlib "^1.1.1"
+    mkdirp "^0.5.0"
+    safe-buffer "^5.1.2"
+    yallist "^3.0.2"
+
+term-size@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/term-size/-/term-size-1.2.0.tgz#458b83887f288fc56d6fffbfad262e26638efa69"
+  integrity sha1-RYuDiH8oj8Vtb/+/rSYuJmOO+mk=
+  dependencies:
+    execa "^0.7.0"
+
+time-zone@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/time-zone/-/time-zone-1.0.0.tgz#99c5bf55958966af6d06d83bdf3800dc82faec5d"
+  integrity sha1-mcW/VZWJZq9tBtg73zgA3IL67F0=
+
+timed-out@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/timed-out/-/timed-out-4.0.1.tgz#f32eacac5a175bea25d7fab565ab3ed8741ef56f"
+  integrity sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8=
+
+to-fast-properties@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-2.0.0.tgz#dc5e698cbd079265bc73e0377681a4e4e83f616e"
+  integrity sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=
+
+to-object-path@^0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/to-object-path/-/to-object-path-0.3.0.tgz#297588b7b0e7e0ac08e04e672f85c1f4999e17af"
+  integrity sha1-KXWIt7Dn4KwI4E5nL4XB9JmeF68=
+  dependencies:
+    kind-of "^3.0.2"
+
+to-regex-range@^2.1.0:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/to-regex-range/-/to-regex-range-2.1.1.tgz#7c80c17b9dfebe599e27367e0d4dd5590141db38"
+  integrity sha1-fIDBe53+vlmeJzZ+DU3VWQFB2zg=
+  dependencies:
+    is-number "^3.0.0"
+    repeat-string "^1.6.1"
+
+to-regex@^3.0.1, to-regex@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/to-regex/-/to-regex-3.0.2.tgz#13cfdd9b336552f30b51f33a8ae1b42a7a7599ce"
+  integrity sha512-FWtleNAtZ/Ki2qtqej2CXTOayOH9bHDQF+Q48VpWyDXjbYxA4Yz8iDB31zXOBUlOHHKidDbqGVrTUvQMPmBGBw==
+  dependencies:
+    define-property "^2.0.2"
+    extend-shallow "^3.0.2"
+    regex-not "^1.0.2"
+    safe-regex "^1.1.0"
+
+tough-cookie@~2.4.3:
+  version "2.4.3"
+  resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.4.3.tgz#53f36da3f47783b0925afa06ff9f3b165280f781"
+  integrity sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==
+  dependencies:
+    psl "^1.1.24"
+    punycode "^1.4.1"
+
+trim-newlines@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/trim-newlines/-/trim-newlines-2.0.0.tgz#b403d0b91be50c331dfc4b82eeceb22c3de16d20"
+  integrity sha1-tAPQuRvlDDMd/EuC7s6yLD3hbSA=
+
+trim-off-newlines@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/trim-off-newlines/-/trim-off-newlines-1.0.1.tgz#9f9ba9d9efa8764c387698bcbfeb2c848f11adb3"
+  integrity sha1-n5up2e+odkw4dpi8v+sshI8RrbM=
+
+trim-right@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/trim-right/-/trim-right-1.0.1.tgz#cb2e1203067e0c8de1f614094b9fe45704ea6003"
+  integrity sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=
+
+tunnel-agent@^0.6.0:
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/tunnel-agent/-/tunnel-agent-0.6.0.tgz#27a5dea06b36b04a0a9966774b290868f0fc40fd"
+  integrity sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=
+  dependencies:
+    safe-buffer "^5.0.1"
+
+tweetnacl@^0.14.3, tweetnacl@~0.14.0:
+  version "0.14.5"
+  resolved "https://registry.yarnpkg.com/tweetnacl/-/tweetnacl-0.14.5.tgz#5ae68177f192d4456269d108afa93ff8743f4f64"
+  integrity sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=
+
+type-fest@^0.3.0:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.3.1.tgz#63d00d204e059474fe5e1b7c011112bbd1dc29e1"
+  integrity sha512-cUGJnCdr4STbePCgqNFbpVNCepa+kAVohJs1sLhxzdH+gnEoOd8VhbYa7pD3zZYGiURWM2xzEII3fQcRizDkYQ==
+
+typescript@^3.4.5:
+  version "3.4.5"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.5.tgz#2d2618d10bb566572b8d7aad5180d84257d70a99"
+  integrity sha512-YycBxUb49UUhdNMU5aJ7z5Ej2XGmaIBL0x34vZ82fn3hGvD+bgrMrVDpatgz2f7YxUMJxMkbWxJZeAvDxVe7Vw==
+
+uid2@0.0.3:
+  version "0.0.3"
+  resolved "https://registry.yarnpkg.com/uid2/-/uid2-0.0.3.tgz#483126e11774df2f71b8b639dcd799c376162b82"
+  integrity sha1-SDEm4Rd03y9xuLY53NeZw3YWK4I=
+
+unicode-canonical-property-names-ecmascript@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz#2619800c4c825800efdd8343af7dd9933cbe2818"
+  integrity sha512-jDrNnXWHd4oHiTZnx/ZG7gtUTVp+gCcTTKr8L0HjlwphROEW3+Him+IpvC+xcJEFegapiMZyZe02CyuOnRmbnQ==
+
+unicode-match-property-ecmascript@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/unicode-match-property-ecmascript/-/unicode-match-property-ecmascript-1.0.4.tgz#8ed2a32569961bce9227d09cd3ffbb8fed5f020c"
+  integrity sha512-L4Qoh15vTfntsn4P1zqnHulG0LdXgjSO035fEpdtp6YxXhMT51Q6vgM5lYdG/5X3MjS+k/Y9Xw4SFCY9IkR0rg==
+  dependencies:
+    unicode-canonical-property-names-ecmascript "^1.0.4"
+    unicode-property-aliases-ecmascript "^1.0.4"
+
+unicode-match-property-value-ecmascript@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.1.0.tgz#5b4b426e08d13a80365e0d657ac7a6c1ec46a277"
+  integrity sha512-hDTHvaBk3RmFzvSl0UVrUmC3PuW9wKVnpoUDYH0JDkSIovzw+J5viQmeYHxVSBptubnr7PbH2e0fnpDRQnQl5g==
+
+unicode-property-aliases-ecmascript@^1.0.4:
+  version "1.0.5"
+  resolved "https://registry.yarnpkg.com/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.0.5.tgz#a9cc6cc7ce63a0a3023fc99e341b94431d405a57"
+  integrity sha512-L5RAqCfXqAwR3RriF8pM0lU0w4Ryf/GgzONwi6KnL1taJQa7x1TCxdJnILX59WIGOwR57IVxn7Nej0fz1Ny6fw==
+
+union-value@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/union-value/-/union-value-1.0.0.tgz#5c71c34cb5bad5dcebe3ea0cd08207ba5aa1aea4"
+  integrity sha1-XHHDTLW61dzr4+oM0IIHulqhrqQ=
+  dependencies:
+    arr-union "^3.1.0"
+    get-value "^2.0.6"
+    is-extendable "^0.1.1"
+    set-value "^0.4.3"
+
+unique-string@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/unique-string/-/unique-string-1.0.0.tgz#9e1057cca851abb93398f8b33ae187b99caec11a"
+  integrity sha1-nhBXzKhRq7kzmPizOuGHuZyuwRo=
+  dependencies:
+    crypto-random-string "^1.0.0"
+
+unique-temp-dir@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/unique-temp-dir/-/unique-temp-dir-1.0.0.tgz#6dce95b2681ca003eebfb304a415f9cbabcc5385"
+  integrity sha1-bc6VsmgcoAPuv7MEpBX5y6vMU4U=
+  dependencies:
+    mkdirp "^0.5.1"
+    os-tmpdir "^1.0.1"
+    uid2 "0.0.3"
+
+unset-value@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/unset-value/-/unset-value-1.0.0.tgz#8376873f7d2335179ffb1e6fc3a8ed0dfc8ab559"
+  integrity sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=
+  dependencies:
+    has-value "^0.3.1"
+    isobject "^3.0.0"
+
+unzip-response@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/unzip-response/-/unzip-response-2.0.1.tgz#d2f0f737d16b0615e72a6935ed04214572d56f97"
+  integrity sha1-0vD3N9FrBhXnKmk17QQhRXLVb5c=
+
+upath@^1.1.1:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/upath/-/upath-1.1.2.tgz#3db658600edaeeccbe6db5e684d67ee8c2acd068"
+  integrity sha512-kXpym8nmDmlCBr7nKdIx8P2jNBa+pBpIUFRnKJ4dr8htyYGJFokkr2ZvERRtUN+9SY+JqXouNgUPtv6JQva/2Q==
+
+update-notifier@^2.5.0:
+  version "2.5.0"
+  resolved "https://registry.yarnpkg.com/update-notifier/-/update-notifier-2.5.0.tgz#d0744593e13f161e406acb1d9408b72cad08aff6"
+  integrity sha512-gwMdhgJHGuj/+wHJJs9e6PcCszpxR1b236igrOkUofGhqJuG+amlIKwApH1IW1WWl7ovZxsX49lMBWLxSdm5Dw==
+  dependencies:
+    boxen "^1.2.1"
+    chalk "^2.0.1"
+    configstore "^3.0.0"
+    import-lazy "^2.1.0"
+    is-ci "^1.0.10"
+    is-installed-globally "^0.1.0"
+    is-npm "^1.0.0"
+    latest-version "^3.0.0"
+    semver-diff "^2.0.0"
+    xdg-basedir "^3.0.0"
+
+uri-js@^4.2.2:
+  version "4.2.2"
+  resolved "https://registry.yarnpkg.com/uri-js/-/uri-js-4.2.2.tgz#94c540e1ff772956e2299507c010aea6c8838eb0"
+  integrity sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==
+  dependencies:
+    punycode "^2.1.0"
+
+urix@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/urix/-/urix-0.1.0.tgz#da937f7a62e21fec1fd18d49b35c2935067a6c72"
+  integrity sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=
+
+url-parse-lax@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/url-parse-lax/-/url-parse-lax-1.0.0.tgz#7af8f303645e9bd79a272e7a14ac68bc0609da73"
+  integrity sha1-evjzA2Rem9eaJy56FKxovAYJ2nM=
+  dependencies:
+    prepend-http "^1.0.1"
+
+use@^3.1.0:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/use/-/use-3.1.1.tgz#d50c8cac79a19fbc20f2911f56eb973f4e10070f"
+  integrity sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==
+
+util-deprecate@~1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
+  integrity sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=
+
+uuid@^3.3.2:
+  version "3.3.2"
+  resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.3.2.tgz#1b4af4955eb3077c501c23872fc6513811587131"
+  integrity sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==
+
+validate-npm-package-license@^3.0.1:
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz#fc91f6b9c7ba15c857f4cb2c5defeec39d4f410a"
+  integrity sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==
+  dependencies:
+    spdx-correct "^3.0.0"
+    spdx-expression-parse "^3.0.0"
+
+verror@1.10.0:
+  version "1.10.0"
+  resolved "https://registry.yarnpkg.com/verror/-/verror-1.10.0.tgz#3a105ca17053af55d6e270c1f8288682e18da400"
+  integrity sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=
+  dependencies:
+    assert-plus "^1.0.0"
+    core-util-is "1.0.2"
+    extsprintf "^1.2.0"
+
+wcwidth@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/wcwidth/-/wcwidth-1.0.1.tgz#f0b0dcf915bc5ff1528afadb2c0e17b532da2fe8"
+  integrity sha1-8LDc+RW8X/FSivrbLA4XtTLaL+g=
+  dependencies:
+    defaults "^1.0.3"
+
+well-known-symbols@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/well-known-symbols/-/well-known-symbols-2.0.0.tgz#e9c7c07dbd132b7b84212c8174391ec1f9871ba5"
+  integrity sha512-ZMjC3ho+KXo0BfJb7JgtQ5IBuvnShdlACNkKkdsqBmYw3bPAaJfPeYUo6tLUaT5tG/Gkh7xkpBhKRQ9e7pyg9Q==
+
+which@^1.2.9:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/which/-/which-1.3.1.tgz#a45043d54f5805316da8d62f9f50918d3da70b0a"
+  integrity sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==
+  dependencies:
+    isexe "^2.0.0"
+
+wide-align@^1.1.0:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/wide-align/-/wide-align-1.1.3.tgz#ae074e6bdc0c14a431e804e624549c633b000457"
+  integrity sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==
+  dependencies:
+    string-width "^1.0.2 || 2"
+
+widest-line@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/widest-line/-/widest-line-2.0.1.tgz#7438764730ec7ef4381ce4df82fb98a53142a3fc"
+  integrity sha512-Ba5m9/Fa4Xt9eb2ELXt77JxVDV8w7qQrH0zS/TWSJdLyAwQjWoOzpzj5lwVftDz6n/EOu3tNACS84v509qwnJA==
+  dependencies:
+    string-width "^2.1.1"
+
+wrappy@1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
+  integrity sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=
+
+write-file-atomic@^2.0.0:
+  version "2.4.2"
+  resolved "https://registry.yarnpkg.com/write-file-atomic/-/write-file-atomic-2.4.2.tgz#a7181706dfba17855d221140a9c06e15fcdd87b9"
+  integrity sha512-s0b6vB3xIVRLWywa6X9TOMA7k9zio0TMOsl9ZnDkliA/cfJlpHXAscj0gbHVJiTdIuAYpIyqS5GW91fqm6gG5g==
+  dependencies:
+    graceful-fs "^4.1.11"
+    imurmurhash "^0.1.4"
+    signal-exit "^3.0.2"
+
+xdg-basedir@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-3.0.0.tgz#496b2cc109eca8dbacfe2dc72b603c17c5870ad4"
+  integrity sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=
+
+xtend@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"
+  integrity sha1-pcbVMr5lbiPbgg77lDofBJmNY68=
+
+yallist@^2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/yallist/-/yallist-2.1.2.tgz#1c11f9218f076089a47dd512f93c6699a6a81d52"
+  integrity sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=
+
+yallist@^3.0.0, yallist@^3.0.2:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.0.3.tgz#b4b049e314be545e3ce802236d6cd22cd91c3de9"
+  integrity sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==
+
+yargs-parser@^10.0.0:
+  version "10.1.0"
+  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-10.1.0.tgz#7202265b89f7e9e9f2e5765e0fe735a905edbaa8"
+  integrity sha512-VCIyR1wJoEBZUqk5PA+oOBF6ypbwh5aNB3I50guxAL/quggdfs4TtNHQrSazFA3fYZ+tEqfs0zIGlv0c/rgjbQ==
+  dependencies:
+    camelcase "^4.1.0"