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import { Operator } from '../Operator';
import { Observable } from '../Observable';
import { Subscriber } from '../Subscriber';
import { Subscription } from '../Subscription';
import { OuterSubscriber } from '../OuterSubscriber';
import { InnerSubscriber } from '../InnerSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
import { ObservableInput, OperatorFunction } from '../types';
import { switchMap } from './switchMap';
/* tslint:disable:max-line-length */
export function switchMapTo<R>(observable: ObservableInput<R>): OperatorFunction<any, R>;
/** @deprecated resultSelector is no longer supported. Switch to using switchMap with an inner map */
export function switchMapTo<T, R>(observable: ObservableInput<R>, resultSelector: undefined): OperatorFunction<T, R>;
/** @deprecated resultSelector is no longer supported. Switch to using switchMap with an inner map */
export function switchMapTo<T, I, R>(observable: ObservableInput<I>, resultSelector: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R): OperatorFunction<T, R>;
/* tslint:enable:max-line-length */
/**
* 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
* Rerun an interval Observable on every click event
* ```javascript
* import { fromEvent, interval } from 'rxjs';
* import { switchMapTo } from 'rxjs/operators';
*
* 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 {Observable} 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.
* @method switchMapTo
* @owner Observable
*/
export function switchMapTo<T, I, R>(
innerObservable: ObservableInput<I>,
resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R
): OperatorFunction<T, I|R> {
return resultSelector ? switchMap(() => innerObservable, resultSelector) : switchMap(() => innerObservable);
}
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