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+/// <reference types="node" />
+/**
+ * @license
+ * Copyright 2016 Palantir Technologies, Inc.
+ *
+ * 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.
+ */
+/**
+ * Enforces the invariant that the input is an array.
+ */
+export declare function arrayify<T>(arg?: T | T[]): T[];
+/**
+ * @deprecated (no longer used)
+ * Enforces the invariant that the input is an object.
+ */
+export declare function objectify(arg: any): any;
+export declare function hasOwnProperty(arg: {}, key: string): boolean;
+/**
+ * Replace hyphens in a rule name by upper-casing the letter after them.
+ * E.g. "foo-bar" -> "fooBar"
+ */
+export declare function camelize(stringWithHyphens: string): string;
+export declare function isUpperCase(str: string): boolean;
+export declare function isLowerCase(str: string): boolean;
+/**
+ * Removes leading indents from a template string without removing all leading whitespace
+ */
+export declare function dedent(strings: TemplateStringsArray, ...values: any[]): string;
+/**
+ * Strip comments from file content.
+ */
+export declare function stripComments(content: string): string;
+/**
+ * Escapes all special characters in RegExp pattern to avoid broken regular expressions and ensure proper matches
+ */
+export declare function escapeRegExp(re: string): string;
+/** Return true if both parameters are equal. */
+export declare type Equal<T> = (a: T, b: T) => boolean;
+export declare function arraysAreEqual<T>(a: T[] | undefined, b: T[] | undefined, eq: Equal<T>): boolean;
+/** Returns the first non-`undefined` result. */
+export declare function find<T, U>(inputs: T[], getResult: (t: T) => U | undefined): U | undefined;
+/** Returns an array that is the concatenation of all output arrays. */
+export declare function flatMap<T, U>(inputs: T[], getOutputs: (input: T) => U[]): U[];
+/** Returns an array of all outputs that are not `undefined`. */
+export declare function mapDefined<T, U>(inputs: T[], getOutput: (input: T) => U | undefined): U[];
+export declare function readBufferWithDetectedEncoding(buffer: Buffer): string;
+export declare type Encoding = "utf8" | "utf8-bom" | "utf16le" | "utf16be";
+export declare function detectBufferEncoding(buffer: Buffer, length?: number): Encoding;