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node_modules/core-js/internals/async-from-sync-iterator.js

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+'use strict';
+var call = require('../internals/function-call');
+var anObject = require('../internals/an-object');
+var create = require('../internals/object-create');
+var getMethod = require('../internals/get-method');
+var defineBuiltIns = require('../internals/define-built-ins');
+var InternalStateModule = require('../internals/internal-state');
+var getBuiltIn = require('../internals/get-built-in');
+var AsyncIteratorPrototype = require('../internals/async-iterator-prototype');
+var createIterResultObject = require('../internals/create-iter-result-object');
+
+var Promise = getBuiltIn('Promise');
+
+var ASYNC_FROM_SYNC_ITERATOR = 'AsyncFromSyncIterator';
+var setInternalState = InternalStateModule.set;
+var getInternalState = InternalStateModule.getterFor(ASYNC_FROM_SYNC_ITERATOR);
+
+var asyncFromSyncIteratorContinuation = function (result, resolve, reject) {
+  var done = result.done;
+  Promise.resolve(result.value).then(function (value) {
+    resolve(createIterResultObject(value, done));
+  }, reject);
+};
+
+var AsyncFromSyncIterator = function AsyncIterator(iteratorRecord) {
+  iteratorRecord.type = ASYNC_FROM_SYNC_ITERATOR;
+  setInternalState(this, iteratorRecord);
+};
+
+AsyncFromSyncIterator.prototype = defineBuiltIns(create(AsyncIteratorPrototype), {
+  next: function next() {
+    var state = getInternalState(this);
+    return new Promise(function (resolve, reject) {
+      var result = anObject(call(state.next, state.iterator));
+      asyncFromSyncIteratorContinuation(result, resolve, reject);
+    });
+  },
+  'return': function () {
+    var iterator = getInternalState(this).iterator;
+    return new Promise(function (resolve, reject) {
+      var $return = getMethod(iterator, 'return');
+      if ($return === undefined) return resolve(createIterResultObject(undefined, true));
+      var result = anObject(call($return, iterator));
+      asyncFromSyncIteratorContinuation(result, resolve, reject);
+    });
+  }
+});
+
+module.exports = AsyncFromSyncIterator;