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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
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/// <reference no-default-lib="true"/>


/// <reference lib="es2015.symbol" />
/// <reference lib="es2015.iterable" />

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>;
}