'use strict';
|
var bind = require('../internals/function-bind-context');
|
var uncurryThis = require('../internals/function-uncurry-this');
|
var toObject = require('../internals/to-object');
|
var isConstructor = require('../internals/is-constructor');
|
var getAsyncIterator = require('../internals/get-async-iterator');
|
var getIterator = require('../internals/get-iterator');
|
var getIteratorDirect = require('../internals/get-iterator-direct');
|
var getIteratorMethod = require('../internals/get-iterator-method');
|
var getMethod = require('../internals/get-method');
|
var getBuiltIn = require('../internals/get-built-in');
|
var getBuiltInPrototypeMethod = require('../internals/get-built-in-prototype-method');
|
var wellKnownSymbol = require('../internals/well-known-symbol');
|
var AsyncFromSyncIterator = require('../internals/async-from-sync-iterator');
|
var toArray = require('../internals/async-iterator-iteration').toArray;
|
|
var ASYNC_ITERATOR = wellKnownSymbol('asyncIterator');
|
var arrayIterator = uncurryThis(getBuiltInPrototypeMethod('Array', 'values'));
|
var arrayIteratorNext = uncurryThis(arrayIterator([]).next);
|
|
var safeArrayIterator = function () {
|
return new SafeArrayIterator(this);
|
};
|
|
var SafeArrayIterator = function (O) {
|
this.iterator = arrayIterator(O);
|
};
|
|
SafeArrayIterator.prototype.next = function () {
|
return arrayIteratorNext(this.iterator);
|
};
|
|
// `Array.fromAsync` method implementation
|
// https://github.com/tc39/proposal-array-from-async
|
module.exports = 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) {
|
var O = toObject(asyncItems);
|
if (mapfn !== undefined) mapfn = bind(mapfn, thisArg);
|
var usingAsyncIterator = getMethod(O, ASYNC_ITERATOR);
|
var usingSyncIterator = usingAsyncIterator ? undefined : getIteratorMethod(O) || safeArrayIterator;
|
var A = isConstructor(C) ? new C() : [];
|
var iterator = usingAsyncIterator
|
? getAsyncIterator(O, usingAsyncIterator)
|
: new AsyncFromSyncIterator(getIteratorDirect(getIterator(O, usingSyncIterator)));
|
resolve(toArray(iterator, mapfn, A));
|
});
|
};
|
