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Dir : ~/usr/share/nodejs/core-js/modules/

View File Name : esnext.typed-array.from-async.js

'use strict';
// TODO: Remove from `core-js@4`
var getBuiltIn = require('../internals/get-built-in');
var aConstructor = require('../internals/a-constructor');
var arrayFromAsync = require('../internals/array-from-async');
var ArrayBufferViewCore = require('../internals/array-buffer-view-core');
var arrayFromConstructorAndList = require('../internals/array-from-constructor-and-list');

var aTypedArrayConstructor = ArrayBufferViewCore.aTypedArrayConstructor;
var exportTypedArrayStaticMethod = ArrayBufferViewCore.exportTypedArrayStaticMethod;

// `%TypedArray%.fromAsync` method
// https://github.com/tc39/proposal-array-from-async
exportTypedArrayStaticMethod('fromAsync', function fromAsync(asyncItems /* , mapfn = undefined, thisArg = undefined */) {
  var C = this;
  var argumentsLength = arguments.length;
  var mapfn = argumentsLength > 1 ? arguments[1] : undefined;
  var thisArg = argumentsLength > 2 ? arguments[2] : undefined;
  return new (getBuiltIn('Promise'))(function (resolve) {
    aConstructor(C);
    resolve(arrayFromAsync(asyncItems, mapfn, thisArg));
  }).then(function (list) {
    return arrayFromConstructorAndList(aTypedArrayConstructor(C), list);
  });
}, true);