import { Observable } from '../Observable';
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import { OperatorFunction, ObservedValueOf } from '../../internal/types';
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import { mergeMap } from './mergeMap';
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import { ObservableInput } from '../types';
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/* tslint:disable:max-line-length */
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export function mergeMapTo<T, O extends ObservableInput<any>>(innerObservable: O, concurrent?: number): OperatorFunction<any, ObservedValueOf<O>>;
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/** @deprecated */
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export function mergeMapTo<T, R, O extends ObservableInput<any>>(innerObservable: O, resultSelector: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R, concurrent?: number): OperatorFunction<T, R>;
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/* tslint:enable:max-line-length */
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/**
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* Projects each source value to the same Observable which is merged multiple
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* times in the output Observable.
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*
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* <span class="informal">It's like {@link mergeMap}, but maps each value always
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* to the same inner Observable.</span>
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*
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* 
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*
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* Maps each source value to the given Observable `innerObservable` regardless
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* of the source value, and then merges those resulting Observables into one
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* single Observable, which is the output Observable.
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*
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* ## Example
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* For each click event, start an interval Observable ticking every 1 second
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* ```ts
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* import { fromEvent, interval } from 'rxjs';
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* import { mergeMapTo } from 'rxjs/operators';
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*
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* const clicks = fromEvent(document, 'click');
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* const result = clicks.pipe(mergeMapTo(interval(1000)));
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* result.subscribe(x => console.log(x));
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* ```
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*
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* @see {@link concatMapTo}
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* @see {@link merge}
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* @see {@link mergeAll}
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* @see {@link mergeMap}
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* @see {@link mergeScan}
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* @see {@link switchMapTo}
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*
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* @param {ObservableInput} innerObservable An Observable to replace each value from
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* the source Observable.
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* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
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* Observables being subscribed to concurrently.
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* @return {Observable} An Observable that emits items from the given
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* `innerObservable`
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* @method mergeMapTo
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* @owner Observable
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*/
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export function mergeMapTo<T, R, O extends ObservableInput<any>>(
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innerObservable: O,
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resultSelector?: ((outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R) | number,
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concurrent: number = Number.POSITIVE_INFINITY
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): OperatorFunction<T, ObservedValueOf<O>|R> {
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if (typeof resultSelector === 'function') {
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return mergeMap(() => innerObservable, resultSelector, concurrent);
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}
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if (typeof resultSelector === 'number') {
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concurrent = resultSelector;
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}
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return mergeMap(() => innerObservable, concurrent);
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}
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