33 lines
609 B
JavaScript
Executable file
33 lines
609 B
JavaScript
Executable file
import {
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invokeCallback,
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subscribe,
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FULFILLED,
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REJECTED,
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noop,
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makePromise,
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PROMISE_ID
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} from './-internal';
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import { asap } from './asap';
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export default function then(onFulfillment, onRejection) {
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const parent = this;
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const child = new this.constructor(noop);
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if (child[PROMISE_ID] === undefined) {
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makePromise(child);
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}
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const { _state } = parent;
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if (_state) {
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const callback = arguments[_state - 1];
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asap(() => invokeCallback(_state, child, callback, parent._result));
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} else {
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subscribe(parent, child, onFulfillment, onRejection);
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}
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return child;
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}
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