/*! ***************************************************************************** Copyright © Microsoft Corporation. All rights reserved. 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 www.apache.org/licenses/LICENSE-2.0

THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR NON-INFRINGEMENT.

See the Apache Version 2.0 License for specific language governing permissions and limitations under the License. ***************************************************************************** */

/// <reference no-default-lib=“true”/>

interface Symbol {

/** Returns a string representation of an object. */
toString(): string;

/** Returns the primitive value of the specified object. */
valueOf(): Object;

}

interface SymbolConstructor {

/** 
  * A reference to the prototype. 
  */
readonly prototype: Symbol;

/**
  * Returns a new unique Symbol value.
  * @param  description Description of the new Symbol object.
  */
(description?: string|number): symbol;

/**
  * Returns a Symbol object from the global symbol registry matching the given key if found. 
  * Otherwise, returns a new symbol with this key.
  * @param key key to search for.
  */
for(key: string): symbol;

/**
  * Returns a key from the global symbol registry matching the given Symbol if found. 
  * Otherwise, returns a undefined.
  * @param sym Symbol to find the key for.
  */
keyFor(sym: symbol): string | undefined;

}

declare var Symbol: SymbolConstructor;