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- function isPromiseLike(object) {
- return (object != null && typeof object.then === 'function');
- }
- const defaultOnRejectedFn = (reason) => {
- throw reason;
- };
- export class ValueOrPromise {
- state;
- constructor(executor) {
- let value;
- try {
- value = executor();
- }
- catch (reason) {
- this.state = { status: 'rejected', value: reason };
- return;
- }
- if (isPromiseLike(value)) {
- this.state = { status: 'pending', value };
- return;
- }
- this.state = { status: 'fulfilled', value };
- }
- then(onFulfilled, onRejected) {
- const state = this.state;
- if (state.status === 'pending') {
- return new ValueOrPromise(() => state.value.then(onFulfilled, onRejected));
- }
- const onRejectedFn = typeof onRejected === 'function' ? onRejected : defaultOnRejectedFn;
- if (state.status === 'rejected') {
- return new ValueOrPromise(() => onRejectedFn(state.value));
- }
- try {
- const onFulfilledFn = typeof onFulfilled === 'function' ? onFulfilled : undefined;
- return onFulfilledFn === undefined
- ? new ValueOrPromise(() => state.value)
- : new ValueOrPromise(() => onFulfilledFn(state.value));
- }
- catch (e) {
- return new ValueOrPromise(() => onRejectedFn(e));
- }
- }
- catch(onRejected) {
- return this.then(undefined, onRejected);
- }
- resolve() {
- const state = this.state;
- if (state.status === 'pending') {
- return Promise.resolve(state.value);
- }
- if (state.status === 'rejected') {
- throw state.value;
- }
- return state.value;
- }
- static all(valueOrPromises) {
- let rejected = false;
- let reason;
- let containsPromise = false;
- const values = [];
- for (const valueOrPromise of valueOrPromises) {
- const state = valueOrPromise.state;
- if (state.status === 'rejected') {
- if (rejected) {
- continue;
- }
- rejected = true;
- reason = state.value;
- continue;
- }
- if (state.status === 'pending') {
- containsPromise = true;
- }
- values.push(state.value);
- }
- if (containsPromise) {
- if (rejected) {
- Promise.all(values).catch(() => {
- // Ignore errors
- });
- return new ValueOrPromise(() => {
- throw reason;
- });
- }
- return new ValueOrPromise(() => Promise.all(values));
- }
- return new ValueOrPromise(() => values);
- }
- }
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|