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import { Observable } from './Observable'; import { EmptyError } from './util/EmptyError'; export interface LastValueFromConfig<T> { defaultValue: T; } export function lastValueFrom<T, D>(source: Observable<T>, config: LastValueFromConfig<D>): Promise<T | D>; export function lastValueFrom<T>(source: Observable<T>): Promise<T>; /** * Converts an observable to a promise by subscribing to the observable, * waiting for it to complete, and resolving the returned promise with the * last value from the observed stream. * * If the observable stream completes before any values were emitted, the * returned promise will reject with {@link EmptyError} or will resolve * with the default value if a default was specified. * * If the observable stream emits an error, the returned promise will reject * with that error. * * **WARNING**: Only use this with observables you *know* will complete. If the source * observable does not complete, you will end up with a promise that is hung up, and * potentially all of the state of an async function hanging out in memory. To avoid * this situation, look into adding something like {@link timeout}, {@link take}, * {@link takeWhile}, or {@link takeUntil} amongst others. * * ## Example * * Wait for the last value from a stream and emit it from a promise in * an async function * * ```ts * import { interval, take, lastValueFrom } from 'rxjs'; * * async function execute() { * const source$ = interval(2000).pipe(take(10)); * const finalNumber = await lastValueFrom(source$); * console.log(`The final number is ${ finalNumber }`); * } * * execute(); * * // Expected output: * // 'The final number is 9' * ``` * * @see {@link firstValueFrom} * * @param source the observable to convert to a promise * @param config a configuration object to define the `defaultValue` to use if the source completes without emitting a value */ export function lastValueFrom<T, D>(source: Observable<T>, config?: LastValueFromConfig<D>): Promise<T | D> { const hasConfig = typeof config === 'object'; return new Promise<T | D>((resolve, reject) => { let _hasValue = false; let _value: T; source.subscribe({ next: (value) => { _value = value; _hasValue = true; }, error: reject, complete: () => { if (_hasValue) { resolve(_value); } else if (hasConfig) { resolve(config!.defaultValue); } else { reject(new EmptyError()); } }, }); }); }