/**
 * @license
 * Copyright (c) 2017 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
 */
/**
 * This is a simple pattern to provide a readonly view of a normal javascript
 * collection. Note that this trades performance for protection. There's nothing
 * stoping a user from mutating one of these data structures, save a warning
 * that the typescript compiler may give them.
 *
 * Other options to consider are facebook's Immutable.js which provides a
 * variety of truely immutable data structures.
 */
/** A zero-overhead immutable view of an array. */
export declare type ImmutableArray<V> = ReadonlyArray<V>;
/** A zero-overhead immutable view of a set. */
export declare type ImmutableSet<V> = ReadonlySet<V>;
/** A zero-overhead immutable view of a map. */
export declare type ImmutableMap<K, V> = ReadonlyMap<K, V>;
export declare function asImmutable<V>(array: Array<V>): ImmutableArray<V>;
export declare function asImmutable<V>(set: Set<V>): ImmutableSet<V>;
export declare function asImmutable<K, V>(map: Map<K, V>): ImmutableMap<K, V>;
export declare function asImmutable<O extends object>(object: O): Readonly<O>;
/**
 * Take care, this function is inherently unsafe.
 *
 * You're taking a data structure that has been declare as immutable and getting
 * a mutable reference to it.
 */
export declare function unsafeAsMutable<V>(array: ImmutableArray<V>): Array<V>;
export declare function unsafeAsMutable<V>(set: ImmutableSet<V>): Set<V>;
export declare function unsafeAsMutable<K, V>(map: ImmutableMap<K, V>): Map<K, V>;
export declare function unsafeAsMutable<O extends object>(object: Readonly<O>): O;