33 lines
609 B
JavaScript
33 lines
609 B
JavaScript
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;
|
|
}
|