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authorPinapelz <yukais@pinapelz.com>2025-06-29 11:49:28 -0700
committerPinapelz <yukais@pinapelz.com>2025-06-29 11:49:28 -0700
commitd55b767039605256c736166a942a9138e3eacfd7 (patch)
tree947063b634c50d438a794325f13275e134aa5993 /node_modules/rxjs/src/internal/operators/switchMap.ts
parent864ce67d89c77d8ef9c3361f80d619853abcf91c (diff)
remove dev node_modules (oops)
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-import { Subscriber } from '../Subscriber';
-import { ObservableInput, OperatorFunction, ObservedValueOf } from '../types';
-import { innerFrom } from '../observable/innerFrom';
-import { operate } from '../util/lift';
-import { createOperatorSubscriber } from './OperatorSubscriber';
-
-/* tslint:disable:max-line-length */
-export function switchMap<T, O extends ObservableInput<any>>(
- project: (value: T, index: number) => O
-): OperatorFunction<T, ObservedValueOf<O>>;
-/** @deprecated The `resultSelector` parameter will be removed in v8. Use an inner `map` instead. Details: https://rxjs.dev/deprecations/resultSelector */
-export function switchMap<T, O extends ObservableInput<any>>(
- project: (value: T, index: number) => O,
- resultSelector: undefined
-): OperatorFunction<T, ObservedValueOf<O>>;
-/** @deprecated The `resultSelector` parameter will be removed in v8. Use an inner `map` instead. Details: https://rxjs.dev/deprecations/resultSelector */
-export function switchMap<T, R, O extends ObservableInput<any>>(
- project: (value: T, index: number) => O,
- resultSelector: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R
-): OperatorFunction<T, R>;
-/* tslint:enable:max-line-length */
-
-/**
- * Projects each source value to an Observable which is merged in the output
- * Observable, emitting values only from the most recently projected Observable.
- *
- * <span class="informal">Maps each value to an Observable, then flattens all of
- * these inner Observables using {@link switchAll}.</span>
- *
- * ![](switchMap.png)
- *
- * Returns an Observable that emits items based on applying a function that you
- * supply to each item emitted by the source Observable, where that function
- * returns an (so-called "inner") Observable. Each time it observes one of these
- * inner Observables, the output Observable begins emitting the items emitted by
- * that inner Observable. When a new inner Observable is emitted, `switchMap`
- * stops emitting items from the earlier-emitted inner Observable and begins
- * emitting items from the new one. It continues to behave like this for
- * subsequent inner Observables.
- *
- * ## Example
- *
- * Generate new Observable according to source Observable values
- *
- * ```ts
- * import { of, switchMap } from 'rxjs';
- *
- * const switched = of(1, 2, 3).pipe(switchMap(x => of(x, x ** 2, x ** 3)));
- * switched.subscribe(x => console.log(x));
- * // outputs
- * // 1
- * // 1
- * // 1
- * // 2
- * // 4
- * // 8
- * // 3
- * // 9
- * // 27
- * ```
- *
- * Restart an interval Observable on every click event
- *
- * ```ts
- * import { fromEvent, switchMap, interval } from 'rxjs';
- *
- * const clicks = fromEvent(document, 'click');
- * const result = clicks.pipe(switchMap(() => interval(1000)));
- * result.subscribe(x => console.log(x));
- * ```
- *
- * @see {@link concatMap}
- * @see {@link exhaustMap}
- * @see {@link mergeMap}
- * @see {@link switchAll}
- * @see {@link switchMapTo}
- *
- * @param project A function that, when applied to an item emitted by the source
- * Observable, returns an Observable.
- * @return A function that returns an Observable that emits the result of
- * applying the projection function (and the optional deprecated
- * `resultSelector`) to each item emitted by the source Observable and taking
- * only the values from the most recently projected inner Observable.
- */
-export function switchMap<T, R, O extends ObservableInput<any>>(
- project: (value: T, index: number) => O,
- resultSelector?: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R
-): OperatorFunction<T, ObservedValueOf<O> | R> {
- return operate((source, subscriber) => {
- let innerSubscriber: Subscriber<ObservedValueOf<O>> | null = null;
- let index = 0;
- // Whether or not the source subscription has completed
- let isComplete = false;
-
- // We only complete the result if the source is complete AND we don't have an active inner subscription.
- // This is called both when the source completes and when the inners complete.
- const checkComplete = () => isComplete && !innerSubscriber && subscriber.complete();
-
- source.subscribe(
- createOperatorSubscriber(
- subscriber,
- (value) => {
- // Cancel the previous inner subscription if there was one
- innerSubscriber?.unsubscribe();
- let innerIndex = 0;
- const outerIndex = index++;
- // Start the next inner subscription
- innerFrom(project(value, outerIndex)).subscribe(
- (innerSubscriber = createOperatorSubscriber(
- subscriber,
- // When we get a new inner value, next it through. Note that this is
- // handling the deprecate result selector here. This is because with this architecture
- // it ends up being smaller than using the map operator.
- (innerValue) => subscriber.next(resultSelector ? resultSelector(value, innerValue, outerIndex, innerIndex++) : innerValue),
- () => {
- // The inner has completed. Null out the inner subscriber to
- // free up memory and to signal that we have no inner subscription
- // currently.
- innerSubscriber = null!;
- checkComplete();
- }
- ))
- );
- },
- () => {
- isComplete = true;
- checkComplete();
- }
- )
- );
- });
-}
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