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36 lines
903 B
36 lines
903 B
import { config } from './config';
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import instrument from './instrument';
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import {
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noop,
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subscribe,
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FULFILLED,
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REJECTED,
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PENDING,
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invokeCallback
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} from './-internal';
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export default function then(onFulfillment, onRejection, label) {
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let parent = this;
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let state = parent._state;
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if (state === FULFILLED && !onFulfillment || state === REJECTED && !onRejection) {
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config.instrument && instrument('chained', parent, parent);
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return parent;
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}
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parent._onError = null;
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let child = new parent.constructor(noop, label);
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let result = parent._result;
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config.instrument && instrument('chained', parent, child);
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if (state === PENDING) {
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subscribe(parent, child, onFulfillment, onRejection);
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} else {
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let callback = state === FULFILLED ? onFulfillment : onRejection;
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config.async(() => invokeCallback(state, child, callback, result));
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}
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return child;
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}
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