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'use strict'; // https://github.com/tc39/proposal-iterator-helpers var $ = require('../internals/export'); var anObject = require('../internals/an-object'); var toPositiveInteger = require('../internals/to-positive-integer'); var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy'); var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise, args) { var iterator = this.iterator; var returnMethod, result; if (!this.remaining--) { result = { done: true, value: undefined }; this.done = true; returnMethod = iterator['return']; if (returnMethod !== undefined) { return Promise.resolve(returnMethod.call(iterator)).then(function () { return result; }); } return result; } return this.next.apply(iterator, args); }); $({ target: 'AsyncIterator', proto: true, real: true }, { take: function take(limit) { return new AsyncIteratorProxy({ iterator: anObject(this), remaining: toPositiveInteger(limit) }); } });