123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899 |
- import { ObservableInputTuple, OperatorFunction } from '../types';
- import { argsOrArgArray } from '../util/argsOrArgArray';
- import { onErrorResumeNext as oERNCreate } from '../observable/onErrorResumeNext';
- export function onErrorResumeNextWith<T, A extends readonly unknown[]>(
- sources: [...ObservableInputTuple<A>]
- ): OperatorFunction<T, T | A[number]>;
- export function onErrorResumeNextWith<T, A extends readonly unknown[]>(
- ...sources: [...ObservableInputTuple<A>]
- ): OperatorFunction<T, T | A[number]>;
- /**
- * When any of the provided Observable emits an complete or error notification, it immediately subscribes to the next one
- * that was passed.
- *
- * <span class="informal">Execute series of Observables, subscribes to next one on error or complete.</span>
- *
- * 
- *
- * `onErrorResumeNext` is an operator that accepts a series of Observables, provided either directly as
- * arguments or as an array. If no single Observable is provided, returned Observable will simply behave the same
- * as the source.
- *
- * `onErrorResumeNext` returns an Observable that starts by subscribing and re-emitting values from the source Observable.
- * When its stream of values ends - no matter if Observable completed or emitted an error - `onErrorResumeNext`
- * will subscribe to the first Observable that was passed as an argument to the method. It will start re-emitting
- * its values as well and - again - when that stream ends, `onErrorResumeNext` will proceed to subscribing yet another
- * Observable in provided series, no matter if previous Observable completed or ended with an error. This will
- * be happening until there is no more Observables left in the series, at which point returned Observable will
- * complete - even if the last subscribed stream ended with an error.
- *
- * `onErrorResumeNext` can be therefore thought of as version of {@link concat} operator, which is more permissive
- * when it comes to the errors emitted by its input Observables. While `concat` subscribes to the next Observable
- * in series only if previous one successfully completed, `onErrorResumeNext` subscribes even if it ended with
- * an error.
- *
- * Note that you do not get any access to errors emitted by the Observables. In particular do not
- * expect these errors to appear in error callback passed to {@link Observable#subscribe}. If you want to take
- * specific actions based on what error was emitted by an Observable, you should try out {@link catchError} instead.
- *
- *
- * ## Example
- *
- * Subscribe to the next Observable after map fails
- *
- * ```ts
- * import { of, onErrorResumeNext, map } from 'rxjs';
- *
- * of(1, 2, 3, 0)
- * .pipe(
- * map(x => {
- * if (x === 0) {
- * throw Error();
- * }
- *
- * return 10 / x;
- * }),
- * onErrorResumeNext(of(1, 2, 3))
- * )
- * .subscribe({
- * next: val => console.log(val),
- * error: err => console.log(err), // Will never be called.
- * complete: () => console.log('that\'s it!')
- * });
- *
- * // Logs:
- * // 10
- * // 5
- * // 3.3333333333333335
- * // 1
- * // 2
- * // 3
- * // 'that's it!'
- * ```
- *
- * @see {@link concat}
- * @see {@link catchError}
- *
- * @param sources `ObservableInput`s passed either directly or as an array.
- * @return A function that returns an Observable that emits values from source
- * Observable, but - if it errors - subscribes to the next passed Observable
- * and so on, until it completes or runs out of Observables.
- */
- export function onErrorResumeNextWith<T, A extends readonly unknown[]>(
- ...sources: [[...ObservableInputTuple<A>]] | [...ObservableInputTuple<A>]
- ): OperatorFunction<T, T | A[number]> {
- // For some reason, TS 4.1 RC gets the inference wrong here and infers the
- // result to be `A[number][]` - completely dropping the ObservableInput part
- // of the type. This makes no sense whatsoever. As a workaround, the type is
- // asserted explicitly.
- const nextSources = argsOrArgArray(sources) as unknown as ObservableInputTuple<A>;
- return (source) => oERNCreate(source, ...nextSources);
- }
- /**
- * @deprecated Renamed. Use {@link onErrorResumeNextWith} instead. Will be removed in v8.
- */
- export const onErrorResumeNext = onErrorResumeNextWith;
|