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Copyright (c) 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 http://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
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MERCHANTABLITY OR NON-INFRINGEMENT. 
 
See the Apache Version 2.0 License for specific language governing permissions
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***************************************************************************** */

/// <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;