/**
 * @license
 * Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt
 * The complete set of authors may be found at
 * http://polymer.github.io/AUTHORS.txt
 * The complete set of contributors may be found at
 * http://polymer.github.io/CONTRIBUTORS.txt
 * Code distributed by Google as part of the polymer project is also
 * subject to an additional IP rights grant found at
 * http://polymer.github.io/PATENTS.txt
 */
/**
 * Simple utility function used to find an item in a set with a predicate
 * function.  Analagous to Array.find(), without requiring converting the set
 * an Array.
 */
export declare function find<T>(items: Iterable<T>, predicate: (item: T) => boolean): T | undefined;
/**
 * Converts string like `abc-xyz__omg` to `abcXyzOmg`.
 */
export declare function camelCase(text: string): string;
/**
 * Returns a set of unique/distinct values returned by calling the given
 * function on each item.
 */
export declare function uniq<T, R>(items: Iterable<T>, map: (item: T) => R): Set<R>;
/**
 * Returns a map of arrays of items, with keys generated by the keygen function.
 */
export declare function partitionMap<K, V>(items: Iterable<V>, keygen: (item: V) => K): Map<K, V[]>;
/**
 * Performs an in-place rewrite of a target object's properties from a given
 * replacement node.  This is useful because there are some transformations
 * of ASTs which simply require replacing a node, but it is not always
 * convenient to obtain the specific parent node property to which a node may be
 * attached out of many possible configurations.
 */
export declare function rewriteObject(target: Object, replacement: Object): void;
/**
 * Generate a valid identifier name which is unique (i.e. does not appear
 * anywhere in the source text provided).  Do this by trying the provided
 * `value` and then successively trying the value with an incrementing suffix
 * counter until one is found that appears nowhere in the source.
 */
export declare function generateUniqueIdentifierName(value: string, source: string): string;