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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
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"/>


/// <reference path="lib.es2015.symbol.d.ts" />
/// <reference path="lib.es2015.iterable.d.ts" />

interface SymbolConstructor {
    /**
     * A method that returns the default async iterator for an object. Called by the semantics of
     * the for-await-of statement.
     */
    readonly asyncIterator: symbol;
}

interface AsyncIterator<T> {
    next(value?: any): Promise<IteratorResult<T>>;
    return?(value?: any): Promise<IteratorResult<T>>;
    throw?(e?: any): Promise<IteratorResult<T>>;
}

interface AsyncIterable<T> {
    [Symbol.asyncIterator](): AsyncIterator<T>;
}

interface AsyncIterableIterator<T> extends AsyncIterator<T> {
    [Symbol.asyncIterator](): AsyncIterableIterator<T>;
}