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