1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
| import {
| invokeCallback,
| subscribe,
| FULFILLED,
| REJECTED,
| noop,
| makePromise,
| PROMISE_ID
| } from './-internal';
|
| import { asap } from './asap';
|
| export default function then(onFulfillment, onRejection) {
| const parent = this;
|
| const child = new this.constructor(noop);
|
| if (child[PROMISE_ID] === undefined) {
| makePromise(child);
| }
|
| const { _state } = parent;
|
| if (_state) {
| const callback = arguments[_state - 1];
| asap(() => invokeCallback(_state, child, callback, parent._result));
| } else {
| subscribe(parent, child, onFulfillment, onRejection);
| }
|
| return child;
| }
|
|
