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import { switchMap } from './switchMap';
import { ObservableInput, OperatorFunction, ObservedValueOf } from '../types';
import { isFunction } from '../util/isFunction';
/** @deprecated Will be removed in v9. Use {@link switchMap} instead: `switchMap(() => result)` */
export function switchMapTo<O extends ObservableInput<unknown>>(observable: O): OperatorFunction<unknown, ObservedValueOf<O>>;
/** @deprecated The `resultSelector` parameter will be removed in v8. Use an inner `map` instead. Details: https://rxjs.dev/deprecations/resultSelector */
export function switchMapTo<O extends ObservableInput<unknown>>(
observable: O,
resultSelector: undefined
): OperatorFunction<unknown, ObservedValueOf<O>>;
/** @deprecated The `resultSelector` parameter will be removed in v8. Use an inner `map` instead. Details: https://rxjs.dev/deprecations/resultSelector */
export function switchMapTo<T, R, O extends ObservableInput<unknown>>(
observable: O,
resultSelector: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R
): OperatorFunction<T, R>;
/**
* Projects each source value to the same Observable which is flattened multiple
* times with {@link switchMap} in the output Observable.
*
* <span class="informal">It's like {@link switchMap}, but maps each value
* always to the same inner Observable.</span>
*
* 
*
* Maps each source value to the given Observable `innerObservable` regardless
* of the source value, and then flattens those resulting Observables into one
* single Observable, which is the output Observable. The output Observables
* emits values only from the most recently emitted instance of
* `innerObservable`.
*
* ## Example
*
* Restart an interval Observable on every click event
*
* ```ts
* import { fromEvent, switchMapTo, interval } from 'rxjs';
*
* const clicks = fromEvent(document, 'click');
* const result = clicks.pipe(switchMapTo(interval(1000)));
* result.subscribe(x => console.log(x));
* ```
*
* @see {@link concatMapTo}
* @see {@link switchAll}
* @see {@link switchMap}
* @see {@link mergeMapTo}
*
* @param {ObservableInput} innerObservable An Observable to replace each value from
* the source Observable.
* @return A function that returns an Observable that emits items from the
* given `innerObservable` (and optionally transformed through the deprecated
* `resultSelector`) every time a value is emitted on the source Observable,
* and taking only the values from the most recently projected inner
* Observable.
* @deprecated Will be removed in v9. Use {@link switchMap} instead: `switchMap(() => result)`
*/
export function switchMapTo<T, R, O extends ObservableInput<unknown>>(
innerObservable: O,
resultSelector?: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R
): OperatorFunction<T, ObservedValueOf<O> | R> {
return isFunction(resultSelector) ? switchMap(() => innerObservable, resultSelector) : switchMap(() => innerObservable);
}