node_modules

7 files changed, 559 insertions, 183 deletions

diff --git a/node_modules/readable-stream/lib/_stream_duplex.js b/node_modules/readable-stream/lib/_stream_duplex.js
index 736693b84..c599463dd 100644
--- a/node_modules/readable-stream/lib/_stream_duplex.js
+++ b/node_modules/readable-stream/lib/_stream_duplex.js
@@ -1,3 +1,24 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// 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.
+
 // a duplex stream is just a stream that is both readable and writable.
 // Since JS doesn't have multiple prototypal inheritance, this class
 // prototypally inherits from Readable, and then parasitically from
@@ -7,6 +28,10 @@
 
 /*<replacement>*/
 
+var processNextTick = require('process-nextick-args');
+/*</replacement>*/
+
+/*<replacement>*/
 var objectKeys = Object.keys || function (obj) {
   var keys = [];
   for (var key in obj) {
@@ -18,10 +43,6 @@ var objectKeys = Object.keys || function (obj) {
 module.exports = Duplex;
 
 /*<replacement>*/
-var processNextTick = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
 var util = require('core-util-is');
 util.inherits = require('inherits');
 /*</replacement>*/
@@ -68,6 +89,34 @@ function onEndNT(self) {
   self.end();
 }
 
+Object.defineProperty(Duplex.prototype, 'destroyed', {
+  get: function () {
+    if (this._readableState === undefined || this._writableState === undefined) {
+      return false;
+    }
+    return this._readableState.destroyed && this._writableState.destroyed;
+  },
+  set: function (value) {
+    // we ignore the value if the stream
+    // has not been initialized yet
+    if (this._readableState === undefined || this._writableState === undefined) {
+      return;
+    }
+
+    // backward compatibility, the user is explicitly
+    // managing destroyed
+    this._readableState.destroyed = value;
+    this._writableState.destroyed = value;
+  }
+});
+
+Duplex.prototype._destroy = function (err, cb) {
+  this.push(null);
+  this.end();
+
+  processNextTick(cb, err);
+};
+
 function forEach(xs, f) {
   for (var i = 0, l = xs.length; i < l; i++) {
     f(xs[i], i);
diff --git a/node_modules/readable-stream/lib/_stream_passthrough.js b/node_modules/readable-stream/lib/_stream_passthrough.js
index d06f71f18..a9c835884 100644
--- a/node_modules/readable-stream/lib/_stream_passthrough.js
+++ b/node_modules/readable-stream/lib/_stream_passthrough.js
@@ -1,3 +1,24 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// 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.
+
 // a passthrough stream.
 // basically just the most minimal sort of Transform stream.
 // Every written chunk gets output as-is.
diff --git a/node_modules/readable-stream/lib/_stream_readable.js b/node_modules/readable-stream/lib/_stream_readable.js
index b19b2088b..ee9001cdf 100644
--- a/node_modules/readable-stream/lib/_stream_readable.js
+++ b/node_modules/readable-stream/lib/_stream_readable.js
@@ -1,11 +1,33 @@
-'use strict';
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// 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.
 
-module.exports = Readable;
+'use strict';
 
 /*<replacement>*/
+
 var processNextTick = require('process-nextick-args');
 /*</replacement>*/
 
+module.exports = Readable;
+
 /*<replacement>*/
 var isArray = require('isarray');
 /*</replacement>*/
@@ -28,9 +50,17 @@ var EElistenerCount = function (emitter, type) {
 var Stream = require('./internal/streams/stream');
 /*</replacement>*/
 
-var Buffer = require('buffer').Buffer;
+// TODO(bmeurer): Change this back to const once hole checks are
+// properly optimized away early in Ignition+TurboFan.
 /*<replacement>*/
-var bufferShim = require('buffer-shims');
+var Buffer = require('safe-buffer').Buffer;
+var OurUint8Array = global.Uint8Array || function () {};
+function _uint8ArrayToBuffer(chunk) {
+  return Buffer.from(chunk);
+}
+function _isUint8Array(obj) {
+  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
+}
 /*</replacement>*/
 
 /*<replacement>*/
@@ -49,6 +79,7 @@ if (debugUtil && debugUtil.debuglog) {
 /*</replacement>*/
 
 var BufferList = require('./internal/streams/BufferList');
+var destroyImpl = require('./internal/streams/destroy');
 var StringDecoder;
 
 util.inherits(Readable, Stream);
@@ -87,7 +118,7 @@ function ReadableState(options, stream) {
   this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
 
   // cast to ints.
-  this.highWaterMark = ~~this.highWaterMark;
+  this.highWaterMark = Math.floor(this.highWaterMark);
 
   // A linked list is used to store data chunks instead of an array because the
   // linked list can remove elements from the beginning faster than
@@ -101,10 +132,10 @@ function ReadableState(options, stream) {
   this.endEmitted = false;
   this.reading = false;
 
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
+  // a flag to be able to tell if the event 'readable'/'data' is emitted
+  // immediately, or on a later tick.  We set this to true at first, because
+  // any actions that shouldn't happen until "later" should generally also
+  // not happen before the first read call.
   this.sync = true;
 
   // whenever we return null, then we set a flag to say
@@ -114,15 +145,14 @@ function ReadableState(options, stream) {
   this.readableListening = false;
   this.resumeScheduled = false;
 
+  // has it been destroyed
+  this.destroyed = false;
+
   // Crypto is kind of old and crusty.  Historically, its default string
   // encoding is 'binary' so we have to make this configurable.
   // Everything else in the universe uses 'utf8', though.
   this.defaultEncoding = options.defaultEncoding || 'utf8';
 
-  // when piping, we only care about 'readable' events that happen
-  // after read()ing all the bytes and not getting any pushback.
-  this.ranOut = false;
-
   // the number of writers that are awaiting a drain event in .pipe()s
   this.awaitDrain = 0;
 
@@ -148,87 +178,129 @@ function Readable(options) {
   // legacy
   this.readable = true;
 
-  if (options && typeof options.read === 'function') this._read = options.read;
+  if (options) {
+    if (typeof options.read === 'function') this._read = options.read;
+
+    if (typeof options.destroy === 'function') this._destroy = options.destroy;
+  }
 
   Stream.call(this);
 }
 
+Object.defineProperty(Readable.prototype, 'destroyed', {
+  get: function () {
+    if (this._readableState === undefined) {
+      return false;
+    }
+    return this._readableState.destroyed;
+  },
+  set: function (value) {
+    // we ignore the value if the stream
+    // has not been initialized yet
+    if (!this._readableState) {
+      return;
+    }
+
+    // backward compatibility, the user is explicitly
+    // managing destroyed
+    this._readableState.destroyed = value;
+  }
+});
+
+Readable.prototype.destroy = destroyImpl.destroy;
+Readable.prototype._undestroy = destroyImpl.undestroy;
+Readable.prototype._destroy = function (err, cb) {
+  this.push(null);
+  cb(err);
+};
+
 // Manually shove something into the read() buffer.
 // This returns true if the highWaterMark has not been hit yet,
 // similar to how Writable.write() returns true if you should
 // write() some more.
 Readable.prototype.push = function (chunk, encoding) {
   var state = this._readableState;
-
-  if (!state.objectMode && typeof chunk === 'string') {
-    encoding = encoding || state.defaultEncoding;
-    if (encoding !== state.encoding) {
-      chunk = bufferShim.from(chunk, encoding);
-      encoding = '';
+  var skipChunkCheck;
+
+  if (!state.objectMode) {
+    if (typeof chunk === 'string') {
+      encoding = encoding || state.defaultEncoding;
+      if (encoding !== state.encoding) {
+        chunk = Buffer.from(chunk, encoding);
+        encoding = '';
+      }
+      skipChunkCheck = true;
     }
+  } else {
+    skipChunkCheck = true;
   }
 
-  return readableAddChunk(this, state, chunk, encoding, false);
+  return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
 };
 
 // Unshift should *always* be something directly out of read()
 Readable.prototype.unshift = function (chunk) {
-  var state = this._readableState;
-  return readableAddChunk(this, state, chunk, '', true);
+  return readableAddChunk(this, chunk, null, true, false);
 };
 
-Readable.prototype.isPaused = function () {
-  return this._readableState.flowing === false;
-};
-
-function readableAddChunk(stream, state, chunk, encoding, addToFront) {
-  var er = chunkInvalid(state, chunk);
-  if (er) {
-    stream.emit('error', er);
-  } else if (chunk === null) {
+function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
+  var state = stream._readableState;
+  if (chunk === null) {
     state.reading = false;
     onEofChunk(stream, state);
-  } else if (state.objectMode || chunk && chunk.length > 0) {
-    if (state.ended && !addToFront) {
-      var e = new Error('stream.push() after EOF');
-      stream.emit('error', e);
-    } else if (state.endEmitted && addToFront) {
-      var _e = new Error('stream.unshift() after end event');
-      stream.emit('error', _e);
-    } else {
-      var skipAdd;
-      if (state.decoder && !addToFront && !encoding) {
-        chunk = state.decoder.write(chunk);
-        skipAdd = !state.objectMode && chunk.length === 0;
+  } else {
+    var er;
+    if (!skipChunkCheck) er = chunkInvalid(state, chunk);
+    if (er) {
+      stream.emit('error', er);
+    } else if (state.objectMode || chunk && chunk.length > 0) {
+      if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
+        chunk = _uint8ArrayToBuffer(chunk);
       }
 
-      if (!addToFront) state.reading = false;
-
-      // Don't add to the buffer if we've decoded to an empty string chunk and
-      // we're not in object mode
-      if (!skipAdd) {
-        // if we want the data now, just emit it.
-        if (state.flowing && state.length === 0 && !state.sync) {
-          stream.emit('data', chunk);
-          stream.read(0);
+      if (addToFront) {
+        if (state.endEmitted) stream.emit('error', new Error('stream.unshift() after end event'));else addChunk(stream, state, chunk, true);
+      } else if (state.ended) {
+        stream.emit('error', new Error('stream.push() after EOF'));
+      } else {
+        state.reading = false;
+        if (state.decoder && !encoding) {
+          chunk = state.decoder.write(chunk);
+          if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
         } else {
-          // update the buffer info.
-          state.length += state.objectMode ? 1 : chunk.length;
-          if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
-
-          if (state.needReadable) emitReadable(stream);
+          addChunk(stream, state, chunk, false);
         }
       }
-
-      maybeReadMore(stream, state);
+    } else if (!addToFront) {
+      state.reading = false;
     }
-  } else if (!addToFront) {
-    state.reading = false;
   }
 
   return needMoreData(state);
 }
 
+function addChunk(stream, state, chunk, addToFront) {
+  if (state.flowing && state.length === 0 && !state.sync) {
+    stream.emit('data', chunk);
+    stream.read(0);
+  } else {
+    // update the buffer info.
+    state.length += state.objectMode ? 1 : chunk.length;
+    if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
+
+    if (state.needReadable) emitReadable(stream);
+  }
+  maybeReadMore(stream, state);
+}
+
+function chunkInvalid(state, chunk) {
+  var er;
+  if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
+    er = new TypeError('Invalid non-string/buffer chunk');
+  }
+  return er;
+}
+
 // if it's past the high water mark, we can push in some more.
 // Also, if we have no data yet, we can stand some
 // more bytes.  This is to work around cases where hwm=0,
@@ -240,6 +312,10 @@ function needMoreData(state) {
   return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
 }
 
+Readable.prototype.isPaused = function () {
+  return this._readableState.flowing === false;
+};
+
 // backwards compatibility.
 Readable.prototype.setEncoding = function (enc) {
   if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
@@ -388,14 +464,6 @@ Readable.prototype.read = function (n) {
   return ret;
 };
 
-function chunkInvalid(state, chunk) {
-  var er = null;
-  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
-    er = new TypeError('Invalid non-string/buffer chunk');
-  }
-  return er;
-}
-
 function onEofChunk(stream, state) {
   if (state.ended) return;
   if (state.decoder) {
@@ -483,14 +551,17 @@ Readable.prototype.pipe = function (dest, pipeOpts) {
 
   var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
 
-  var endFn = doEnd ? onend : cleanup;
+  var endFn = doEnd ? onend : unpipe;
   if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);
 
   dest.on('unpipe', onunpipe);
-  function onunpipe(readable) {
+  function onunpipe(readable, unpipeInfo) {
     debug('onunpipe');
     if (readable === src) {
-      cleanup();
+      if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
+        unpipeInfo.hasUnpiped = true;
+        cleanup();
+      }
     }
   }
 
@@ -516,7 +587,7 @@ Readable.prototype.pipe = function (dest, pipeOpts) {
     dest.removeListener('error', onerror);
     dest.removeListener('unpipe', onunpipe);
     src.removeListener('end', onend);
-    src.removeListener('end', cleanup);
+    src.removeListener('end', unpipe);
     src.removeListener('data', ondata);
 
     cleanedUp = true;
@@ -609,6 +680,7 @@ function pipeOnDrain(src) {
 
 Readable.prototype.unpipe = function (dest) {
   var state = this._readableState;
+  var unpipeInfo = { hasUnpiped: false };
 
   // if we're not piping anywhere, then do nothing.
   if (state.pipesCount === 0) return this;
@@ -624,7 +696,7 @@ Readable.prototype.unpipe = function (dest) {
     state.pipes = null;
     state.pipesCount = 0;
     state.flowing = false;
-    if (dest) dest.emit('unpipe', this);
+    if (dest) dest.emit('unpipe', this, unpipeInfo);
     return this;
   }
 
@@ -639,7 +711,7 @@ Readable.prototype.unpipe = function (dest) {
     state.flowing = false;
 
     for (var i = 0; i < len; i++) {
-      dests[i].emit('unpipe', this);
+      dests[i].emit('unpipe', this, unpipeInfo);
     }return this;
   }
 
@@ -651,7 +723,7 @@ Readable.prototype.unpipe = function (dest) {
   state.pipesCount -= 1;
   if (state.pipesCount === 1) state.pipes = state.pipes[0];
 
-  dest.emit('unpipe', this);
+  dest.emit('unpipe', this, unpipeInfo);
 
   return this;
 };
@@ -672,7 +744,7 @@ Readable.prototype.on = function (ev, fn) {
       if (!state.reading) {
         processNextTick(nReadingNextTick, this);
       } else if (state.length) {
-        emitReadable(this, state);
+        emitReadable(this);
       }
     }
   }
@@ -873,7 +945,7 @@ function copyFromBufferString(n, list) {
 // This function is designed to be inlinable, so please take care when making
 // changes to the function body.
 function copyFromBuffer(n, list) {
-  var ret = bufferShim.allocUnsafe(n);
+  var ret = Buffer.allocUnsafe(n);
   var p = list.head;
   var c = 1;
   p.data.copy(ret);
diff --git a/node_modules/readable-stream/lib/_stream_transform.js b/node_modules/readable-stream/lib/_stream_transform.js
index cd2583207..a0c23173d 100644
--- a/node_modules/readable-stream/lib/_stream_transform.js
+++ b/node_modules/readable-stream/lib/_stream_transform.js
@@ -1,3 +1,24 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// 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.
+
 // a transform stream is a readable/writable stream where you do
 // something with the data.  Sometimes it's called a "filter",
 // but that's not a great name for it, since that implies a thing where
@@ -71,7 +92,9 @@ function afterTransform(stream, er, data) {
 
   var cb = ts.writecb;
 
-  if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));
+  if (!cb) {
+    return stream.emit('error', new Error('write callback called multiple times'));
+  }
 
   ts.writechunk = null;
   ts.writecb = null;
@@ -164,6 +187,15 @@ Transform.prototype._read = function (n) {
   }
 };
 
+Transform.prototype._destroy = function (err, cb) {
+  var _this = this;
+
+  Duplex.prototype._destroy.call(this, err, function (err2) {
+    cb(err2);
+    _this.emit('close');
+  });
+};
+
 function done(stream, er, data) {
   if (er) return stream.emit('error', er);
 
diff --git a/node_modules/readable-stream/lib/_stream_writable.js b/node_modules/readable-stream/lib/_stream_writable.js
index 15db03868..d20da88c7 100644
--- a/node_modules/readable-stream/lib/_stream_writable.js
+++ b/node_modules/readable-stream/lib/_stream_writable.js
@@ -1,15 +1,58 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// 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.
+
 // A bit simpler than readable streams.
 // Implement an async ._write(chunk, encoding, cb), and it'll handle all
 // the drain event emission and buffering.
 
 'use strict';
 
-module.exports = Writable;
-
 /*<replacement>*/
+
 var processNextTick = require('process-nextick-args');
 /*</replacement>*/
 
+module.exports = Writable;
+
+/* <replacement> */
+function WriteReq(chunk, encoding, cb) {
+  this.chunk = chunk;
+  this.encoding = encoding;
+  this.callback = cb;
+  this.next = null;
+}
+
+// It seems a linked list but it is not
+// there will be only 2 of these for each stream
+function CorkedRequest(state) {
+  var _this = this;
+
+  this.next = null;
+  this.entry = null;
+  this.finish = function () {
+    onCorkedFinish(_this, state);
+  };
+}
+/* </replacement> */
+
 /*<replacement>*/
 var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;
 /*</replacement>*/
@@ -35,22 +78,23 @@ var internalUtil = {
 var Stream = require('./internal/streams/stream');
 /*</replacement>*/
 
-var Buffer = require('buffer').Buffer;
 /*<replacement>*/
-var bufferShim = require('buffer-shims');
+var Buffer = require('safe-buffer').Buffer;
+var OurUint8Array = global.Uint8Array || function () {};
+function _uint8ArrayToBuffer(chunk) {
+  return Buffer.from(chunk);
+}
+function _isUint8Array(obj) {
+  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
+}
 /*</replacement>*/
 
+var destroyImpl = require('./internal/streams/destroy');
+
 util.inherits(Writable, Stream);
 
 function nop() {}
 
-function WriteReq(chunk, encoding, cb) {
-  this.chunk = chunk;
-  this.encoding = encoding;
-  this.callback = cb;
-  this.next = null;
-}
-
 function WritableState(options, stream) {
   Duplex = Duplex || require('./_stream_duplex');
 
@@ -70,7 +114,10 @@ function WritableState(options, stream) {
   this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
 
   // cast to ints.
-  this.highWaterMark = ~~this.highWaterMark;
+  this.highWaterMark = Math.floor(this.highWaterMark);
+
+  // if _final has been called
+  this.finalCalled = false;
 
   // drain event flag.
   this.needDrain = false;
@@ -81,6 +128,9 @@ function WritableState(options, stream) {
   // when 'finish' is emitted
   this.finished = false;
 
+  // has it been destroyed
+  this.destroyed = false;
+
   // should we decode strings into buffers before passing to _write?
   // this is here so that some node-core streams can optimize string
   // handling at a lower level.
@@ -162,7 +212,7 @@ WritableState.prototype.getBuffer = function getBuffer() {
     Object.defineProperty(WritableState.prototype, 'buffer', {
       get: internalUtil.deprecate(function () {
         return this.getBuffer();
-      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')
+      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
     });
   } catch (_) {}
 })();
@@ -208,6 +258,10 @@ function Writable(options) {
     if (typeof options.write === 'function') this._write = options.write;
 
     if (typeof options.writev === 'function') this._writev = options.writev;
+
+    if (typeof options.destroy === 'function') this._destroy = options.destroy;
+
+    if (typeof options.final === 'function') this._final = options.final;
   }
 
   Stream.call(this);
@@ -248,7 +302,11 @@ function validChunk(stream, state, chunk, cb) {
 Writable.prototype.write = function (chunk, encoding, cb) {
   var state = this._writableState;
   var ret = false;
-  var isBuf = Buffer.isBuffer(chunk);
+  var isBuf = _isUint8Array(chunk) && !state.objectMode;
+
+  if (isBuf && !Buffer.isBuffer(chunk)) {
+    chunk = _uint8ArrayToBuffer(chunk);
+  }
 
   if (typeof encoding === 'function') {
     cb = encoding;
@@ -293,7 +351,7 @@ Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
 
 function decodeChunk(state, chunk, encoding) {
   if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
-    chunk = bufferShim.from(chunk, encoding);
+    chunk = Buffer.from(chunk, encoding);
   }
   return chunk;
 }
@@ -303,8 +361,12 @@ function decodeChunk(state, chunk, encoding) {
 // If we return false, then we need a drain event, so set that flag.
 function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
   if (!isBuf) {
-    chunk = decodeChunk(state, chunk, encoding);
-    if (Buffer.isBuffer(chunk)) encoding = 'buffer';
+    var newChunk = decodeChunk(state, chunk, encoding);
+    if (chunk !== newChunk) {
+      isBuf = true;
+      encoding = 'buffer';
+      chunk = newChunk;
+    }
   }
   var len = state.objectMode ? 1 : chunk.length;
 
@@ -316,7 +378,13 @@ function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
 
   if (state.writing || state.corked) {
     var last = state.lastBufferedRequest;
-    state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);
+    state.lastBufferedRequest = {
+      chunk: chunk,
+      encoding: encoding,
+      isBuf: isBuf,
+      callback: cb,
+      next: null
+    };
     if (last) {
       last.next = state.lastBufferedRequest;
     } else {
@@ -341,10 +409,26 @@ function doWrite(stream, state, writev, len, chunk, encoding, cb) {
 
 function onwriteError(stream, state, sync, er, cb) {
   --state.pendingcb;
-  if (sync) processNextTick(cb, er);else cb(er);
 
-  stream._writableState.errorEmitted = true;
-  stream.emit('error', er);
+  if (sync) {
+    // defer the callback if we are being called synchronously
+    // to avoid piling up things on the stack
+    processNextTick(cb, er);
+    // this can emit finish, and it will always happen
+    // after error
+    processNextTick(finishMaybe, stream, state);
+    stream._writableState.errorEmitted = true;
+    stream.emit('error', er);
+  } else {
+    // the caller expect this to happen before if
+    // it is async
+    cb(er);
+    stream._writableState.errorEmitted = true;
+    stream.emit('error', er);
+    // this can emit finish, but finish must
+    // always follow error
+    finishMaybe(stream, state);
+  }
 }
 
 function onwriteStateUpdate(state) {
@@ -409,11 +493,14 @@ function clearBuffer(stream, state) {
     holder.entry = entry;
 
     var count = 0;
+    var allBuffers = true;
     while (entry) {
       buffer[count] = entry;
+      if (!entry.isBuf) allBuffers = false;
       entry = entry.next;
       count += 1;
     }
+    buffer.allBuffers = allBuffers;
 
     doWrite(stream, state, true, state.length, buffer, '', holder.finish);
 
@@ -487,23 +574,37 @@ Writable.prototype.end = function (chunk, encoding, cb) {
 function needFinish(state) {
   return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
 }
-
-function prefinish(stream, state) {
-  if (!state.prefinished) {
+function callFinal(stream, state) {
+  stream._final(function (err) {
+    state.pendingcb--;
+    if (err) {
+      stream.emit('error', err);
+    }
     state.prefinished = true;
     stream.emit('prefinish');
+    finishMaybe(stream, state);
+  });
+}
+function prefinish(stream, state) {
+  if (!state.prefinished && !state.finalCalled) {
+    if (typeof stream._final === 'function') {
+      state.pendingcb++;
+      state.finalCalled = true;
+      processNextTick(callFinal, stream, state);
+    } else {
+      state.prefinished = true;
+      stream.emit('prefinish');
+    }
   }
 }
 
 function finishMaybe(stream, state) {
   var need = needFinish(state);
   if (need) {
+    prefinish(stream, state);
     if (state.pendingcb === 0) {
-      prefinish(stream, state);
       state.finished = true;
       stream.emit('finish');
-    } else {
-      prefinish(stream, state);
     }
   }
   return need;
@@ -519,26 +620,45 @@ function endWritable(stream, state, cb) {
   stream.writable = false;
 }
 
-// It seems a linked list but it is not
-// there will be only 2 of these for each stream
-function CorkedRequest(state) {
-  var _this = this;
+function onCorkedFinish(corkReq, state, err) {
+  var entry = corkReq.entry;
+  corkReq.entry = null;
+  while (entry) {
+    var cb = entry.callback;
+    state.pendingcb--;
+    cb(err);
+    entry = entry.next;
+  }
+  if (state.corkedRequestsFree) {
+    state.corkedRequestsFree.next = corkReq;
+  } else {
+    state.corkedRequestsFree = corkReq;
+  }
+}
 
-  this.next = null;
-  this.entry = null;
-  this.finish = function (err) {
-    var entry = _this.entry;
-    _this.entry = null;
-    while (entry) {
-      var cb = entry.callback;
-      state.pendingcb--;
-      cb(err);
-      entry = entry.next;
+Object.defineProperty(Writable.prototype, 'destroyed', {
+  get: function () {
+    if (this._writableState === undefined) {
+      return false;
     }
-    if (state.corkedRequestsFree) {
-      state.corkedRequestsFree.next = _this;
-    } else {
-      state.corkedRequestsFree = _this;
+    return this._writableState.destroyed;
+  },
+  set: function (value) {
+    // we ignore the value if the stream
+    // has not been initialized yet
+    if (!this._writableState) {
+      return;
     }
-  };
-}
\ No newline at end of file
+
+    // backward compatibility, the user is explicitly
+    // managing destroyed
+    this._writableState.destroyed = value;
+  }
+});
+
+Writable.prototype.destroy = destroyImpl.destroy;
+Writable.prototype._undestroy = destroyImpl.undestroy;
+Writable.prototype._destroy = function (err, cb) {
+  this.end();
+  cb(err);
+};
\ No newline at end of file
diff --git a/node_modules/readable-stream/lib/internal/streams/BufferList.js b/node_modules/readable-stream/lib/internal/streams/BufferList.js
index e4bfcf02d..d46761597 100644
--- a/node_modules/readable-stream/lib/internal/streams/BufferList.js
+++ b/node_modules/readable-stream/lib/internal/streams/BufferList.js
@@ -1,64 +1,74 @@
 'use strict';
 
-var Buffer = require('buffer').Buffer;
 /*<replacement>*/
-var bufferShim = require('buffer-shims');
-/*</replacement>*/
 
-module.exports = BufferList;
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+var Buffer = require('safe-buffer').Buffer;
+/*</replacement>*/
 
-function BufferList() {
-  this.head = null;
-  this.tail = null;
-  this.length = 0;
+function copyBuffer(src, target, offset) {
+  src.copy(target, offset);
 }
 
-BufferList.prototype.push = function (v) {
-  var entry = { data: v, next: null };
-  if (this.length > 0) this.tail.next = entry;else this.head = entry;
-  this.tail = entry;
-  ++this.length;
-};
+module.exports = function () {
+  function BufferList() {
+    _classCallCheck(this, BufferList);
+
+    this.head = null;
+    this.tail = null;
+    this.length = 0;
+  }
 
-BufferList.prototype.unshift = function (v) {
-  var entry = { data: v, next: this.head };
-  if (this.length === 0) this.tail = entry;
-  this.head = entry;
-  ++this.length;
-};
+  BufferList.prototype.push = function push(v) {
+    var entry = { data: v, next: null };
+    if (this.length > 0) this.tail.next = entry;else this.head = entry;
+    this.tail = entry;
+    ++this.length;
+  };
 
-BufferList.prototype.shift = function () {
-  if (this.length === 0) return;
-  var ret = this.head.data;
-  if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
-  --this.length;
-  return ret;
-};
+  BufferList.prototype.unshift = function unshift(v) {
+    var entry = { data: v, next: this.head };
+    if (this.length === 0) this.tail = entry;
+    this.head = entry;
+    ++this.length;
+  };
 
-BufferList.prototype.clear = function () {
-  this.head = this.tail = null;
-  this.length = 0;
-};
+  BufferList.prototype.shift = function shift() {
+    if (this.length === 0) return;
+    var ret = this.head.data;
+    if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
+    --this.length;
+    return ret;
+  };
 
-BufferList.prototype.join = function (s) {
-  if (this.length === 0) return '';
-  var p = this.head;
-  var ret = '' + p.data;
-  while (p = p.next) {
-    ret += s + p.data;
-  }return ret;
-};
+  BufferList.prototype.clear = function clear() {
+    this.head = this.tail = null;
+    this.length = 0;
+  };
 
-BufferList.prototype.concat = function (n) {
-  if (this.length === 0) return bufferShim.alloc(0);
-  if (this.length === 1) return this.head.data;
-  var ret = bufferShim.allocUnsafe(n >>> 0);
-  var p = this.head;
-  var i = 0;
-  while (p) {
-    p.data.copy(ret, i);
-    i += p.data.length;
-    p = p.next;
-  }
-  return ret;
-};
\ No newline at end of file
+  BufferList.prototype.join = function join(s) {
+    if (this.length === 0) return '';
+    var p = this.head;
+    var ret = '' + p.data;
+    while (p = p.next) {
+      ret += s + p.data;
+    }return ret;
+  };
+
+  BufferList.prototype.concat = function concat(n) {
+    if (this.length === 0) return Buffer.alloc(0);
+    if (this.length === 1) return this.head.data;
+    var ret = Buffer.allocUnsafe(n >>> 0);
+    var p = this.head;
+    var i = 0;
+    while (p) {
+      copyBuffer(p.data, ret, i);
+      i += p.data.length;
+      p = p.next;
+    }
+    return ret;
+  };
+
+  return BufferList;
+}();
\ No newline at end of file
diff --git a/node_modules/readable-stream/lib/internal/streams/destroy.js b/node_modules/readable-stream/lib/internal/streams/destroy.js
new file mode 100644
index 000000000..b3e58c33b
--- /dev/null
+++ b/node_modules/readable-stream/lib/internal/streams/destroy.js
@@ -0,0 +1,72 @@
+'use strict';
+
+/*<replacement>*/
+
+var processNextTick = require('process-nextick-args');
+/*</replacement>*/
+
+// undocumented cb() API, needed for core, not for public API
+function destroy(err, cb) {
+  var _this = this;
+
+  var readableDestroyed = this._readableState && this._readableState.destroyed;
+  var writableDestroyed = this._writableState && this._writableState.destroyed;
+
+  if (readableDestroyed || writableDestroyed) {
+    if (cb) {
+      cb(err);
+    } else if (err && (!this._writableState || !this._writableState.errorEmitted)) {
+      processNextTick(emitErrorNT, this, err);
+    }
+    return;
+  }
+
+  // we set destroyed to true before firing error callbacks in order
+  // to make it re-entrance safe in case destroy() is called within callbacks
+
+  if (this._readableState) {
+    this._readableState.destroyed = true;
+  }
+
+  // if this is a duplex stream mark the writable part as destroyed as well
+  if (this._writableState) {
+    this._writableState.destroyed = true;
+  }
+
+  this._destroy(err || null, function (err) {
+    if (!cb && err) {
+      processNextTick(emitErrorNT, _this, err);
+      if (_this._writableState) {
+        _this._writableState.errorEmitted = true;
+      }
+    } else if (cb) {
+      cb(err);
+    }
+  });
+}
+
+function undestroy() {
+  if (this._readableState) {
+    this._readableState.destroyed = false;
+    this._readableState.reading = false;
+    this._readableState.ended = false;
+    this._readableState.endEmitted = false;
+  }
+
+  if (this._writableState) {
+    this._writableState.destroyed = false;
+    this._writableState.ended = false;
+    this._writableState.ending = false;
+    this._writableState.finished = false;
+    this._writableState.errorEmitted = false;
+  }
+}
+
+function emitErrorNT(self, err) {
+  self.emit('error', err);
+}
+
+module.exports = {
+  destroy: destroy,
+  undestroy: undestroy
+};
\ No newline at end of file