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import { concatMap } from './concatMap';
import { ObservableInput, OperatorFunction, ObservedValueOf } from '../types';
import { isFunction } from '../util/isFunction';
/** @deprecated Will be removed in v9. Use {@link concatMap} instead: `concatMap(() => result)` */
export function concatMapTo<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 concatMapTo<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 concatMapTo<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 merged multiple
* times in a serialized fashion on the output Observable.
*
* <span class="informal">It's like {@link concatMap}, 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. Each new `innerObservable`
* instance emitted on the output Observable is concatenated with the previous
* `innerObservable` instance.
*
* __Warning:__ if source values arrive endlessly and faster than their
* corresponding inner Observables can complete, it will result in memory issues
* as inner Observables amass in an unbounded buffer waiting for their turn to
* be subscribed to.
*
* Note: `concatMapTo` is equivalent to `mergeMapTo` with concurrency parameter
* set to `1`.
*
* ## Example
*
* For each click event, tick every second from 0 to 3, with no concurrency
*
* ```ts
* import { fromEvent, concatMapTo, interval, take } from 'rxjs';
*
* const clicks = fromEvent(document, 'click');
* const result = clicks.pipe(
* concatMapTo(interval(1000).pipe(take(4)))
* );
* result.subscribe(x => console.log(x));
*
* // Results in the following:
* // (results are not concurrent)
* // For every click on the "document" it will emit values 0 to 3 spaced
* // on a 1000ms interval
* // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3
* ```
*
* @see {@link concat}
* @see {@link concatAll}
* @see {@link concatMap}
* @see {@link mergeMapTo}
* @see {@link switchMapTo}
*
* @param innerObservable An `ObservableInput` to replace each value from the
* source Observable.
* @return A function that returns an Observable of values merged together by
* joining the passed Observable with itself, one after the other, for each
* value emitted from the source.
* @deprecated Will be removed in v9. Use {@link concatMap} instead: `concatMap(() => result)`
*/
export function concatMapTo<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) ? concatMap(() => innerObservable, resultSelector) : concatMap(() => innerObservable);
}