| // https://github.com/tc39/proposal-iterator-helpers |
| var $ = require('../internals/export'); |
| var path = require('../internals/path'); |
| var aFunction = require('../internals/a-function'); |
| var anObject = require('../internals/an-object'); |
| var toObject = require('../internals/to-object'); |
| var createAsyncIteratorProxy = require('../internals/create-async-iterator-proxy'); |
| var getAsyncIteratorMethod = require('../internals/get-async-iterator-method'); |
| |
| var AsyncIterator = path.AsyncIterator; |
| |
| var AsyncIteratorProxy = createAsyncIteratorProxy(function (arg) { |
| return anObject(this.next.call(this.iterator, arg)); |
| }, true); |
| |
| $({ target: 'AsyncIterator', stat: true }, { |
| from: function from(O) { |
| var object = toObject(O); |
| var usingIterator = getAsyncIteratorMethod(object); |
| var iterator; |
| if (usingIterator != null) { |
| iterator = aFunction(usingIterator).call(object); |
| if (iterator instanceof AsyncIterator) return iterator; |
| } else { |
| iterator = object; |
| } return new AsyncIteratorProxy({ |
| iterator: iterator |
| }); |
| } |
| }); |