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node_modules/core-js/internals/array-from-async.js

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+'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 getVirtual = require('../internals/entry-virtual');
+var getBuiltIn = require('../internals/get-built-in');
+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(getVirtual('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));
+  });
+};