54 lines
1.5 KiB
TypeScript
54 lines
1.5 KiB
TypeScript
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export class PromiseCompleter<R> {
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promise: Promise<R>;
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resolve: (value?: R|PromiseLike<R>) => void;
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reject: (error?: any, stackTrace?: string) => void;
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constructor() {
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this.promise = new Promise((res, rej) => {
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this.resolve = res;
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this.reject = rej;
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});
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}
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}
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export class PromiseWrapper {
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static resolve<T>(obj: T): Promise<T> { return Promise.resolve(obj); }
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static reject(obj: any, _: any): Promise<any> { return Promise.reject(obj); }
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// Note: We can't rename this method into `catch`, as this is not a valid
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// method name in Dart.
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static catchError<T>(promise: Promise<T>, onError: (error: any) => T | PromiseLike<T>):
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Promise<T> {
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return promise.catch(onError);
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}
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static all<T>(promises: (T|Promise<T>)[]): Promise<T[]> {
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if (promises.length == 0) return Promise.resolve([]);
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return Promise.all(promises);
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}
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static then<T, U>(
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promise: Promise<T>, success: (value: T) => U | PromiseLike<U>,
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rejection?: (error: any, stack?: any) => U | PromiseLike<U>): Promise<U> {
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return promise.then(success, rejection);
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}
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static wrap<T>(computation: () => T): Promise<T> {
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return new Promise((res, rej) => {
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try {
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res(computation());
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} catch (e) {
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rej(e);
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}
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});
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}
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static scheduleMicrotask(computation: () => any): void {
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PromiseWrapper.then(PromiseWrapper.resolve(null), computation, (_) => {});
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}
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static completer<T>(): PromiseCompleter<T> { return new PromiseCompleter<T>(); }
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}
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