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import { Observable } from '../Observable';
import { ObservableInput, ObservableInputTuple, SchedulerLike } from '../types';
import { mergeAll } from '../operators/mergeAll';
import { innerFrom } from './innerFrom';
import { EMPTY } from './empty';
import { popNumber, popScheduler } from '../util/args';
import { from } from './from';
export function merge<A extends readonly unknown[]>(...sources: [...ObservableInputTuple<A>]): Observable<A[number]>;
export function merge<A extends readonly unknown[]>(...sourcesAndConcurrency: [...ObservableInputTuple<A>, number?]): Observable<A[number]>;
/** @deprecated The `scheduler` parameter will be removed in v8. Use `scheduled` and `mergeAll`. Details: https://rxjs.dev/deprecations/scheduler-argument */
export function merge<A extends readonly unknown[]>(
...sourcesAndScheduler: [...ObservableInputTuple<A>, SchedulerLike?]
): Observable<A[number]>;
/** @deprecated The `scheduler` parameter will be removed in v8. Use `scheduled` and `mergeAll`. Details: https://rxjs.dev/deprecations/scheduler-argument */
export function merge<A extends readonly unknown[]>(
...sourcesAndConcurrencyAndScheduler: [...ObservableInputTuple<A>, number?, SchedulerLike?]
): Observable<A[number]>;
/**
* Creates an output Observable which concurrently emits all values from every
* given input Observable.
*
* <span class="informal">Flattens multiple Observables together by blending
* their values into one Observable.</span>
*
* 
*
* `merge` subscribes to each given input Observable (as arguments), and simply
* forwards (without doing any transformation) all the values from all the input
* Observables to the output Observable. The output Observable only completes
* once all input Observables have completed. Any error delivered by an input
* Observable will be immediately emitted on the output Observable.
*
* ## Examples
*
* Merge together two Observables: 1s interval and clicks
*
* ```ts
* import { merge, fromEvent, interval } from 'rxjs';
*
* const clicks = fromEvent(document, 'click');
* const timer = interval(1000);
* const clicksOrTimer = merge(clicks, timer);
* clicksOrTimer.subscribe(x => console.log(x));
*
* // Results in the following:
* // timer will emit ascending values, one every second(1000ms) to console
* // clicks logs MouseEvents to console every time the "document" is clicked
* // Since the two streams are merged you see these happening
* // as they occur.
* ```
*
* Merge together 3 Observables, but run only 2 concurrently
*
* ```ts
* import { interval, take, merge } from 'rxjs';
*
* const timer1 = interval(1000).pipe(take(10));
* const timer2 = interval(2000).pipe(take(6));
* const timer3 = interval(500).pipe(take(10));
*
* const concurrent = 2; // the argument
* const merged = merge(timer1, timer2, timer3, concurrent);
* merged.subscribe(x => console.log(x));
*
* // Results in the following:
* // - First timer1 and timer2 will run concurrently
* // - timer1 will emit a value every 1000ms for 10 iterations
* // - timer2 will emit a value every 2000ms for 6 iterations
* // - after timer1 hits its max iteration, timer2 will
* // continue, and timer3 will start to run concurrently with timer2
* // - when timer2 hits its max iteration it terminates, and
* // timer3 will continue to emit a value every 500ms until it is complete
* ```
*
* @see {@link mergeAll}
* @see {@link mergeMap}
* @see {@link mergeMapTo}
* @see {@link mergeScan}
*
* @param {...ObservableInput} observables Input Observables to merge together.
* @param {number} [concurrent=Infinity] Maximum number of input
* Observables being subscribed to concurrently.
* @param {SchedulerLike} [scheduler=null] The {@link SchedulerLike} to use for managing
* concurrency of input Observables.
* @return {Observable} an Observable that emits items that are the result of
* every input Observable.
*/
export function merge(...args: (ObservableInput<unknown> | number | SchedulerLike)[]): Observable<unknown> {
const scheduler = popScheduler(args);
const concurrent = popNumber(args, Infinity);
const sources = args as ObservableInput<unknown>[];
return !sources.length
? // No source provided
EMPTY
: sources.length === 1
? // One source? Just return it.
innerFrom(sources[0])
: // Merge all sources
mergeAll(concurrent)(from(sources, scheduler));
}