import {Observable} from '../Observable';
import {Scheduler} from '../Scheduler';
import {isScheduler} from '../util/isScheduler';
import {ArrayObservable} from '../observable/fromArray';
import {MergeAllOperator} from './mergeAll-support';
/**
* Joins this observable with multiple other observables by subscribing to them one at a time, starting with the source,
* and merging their results into the returned observable. Will wait for each observable to complete before moving
* on to the next.
* @params {...Observable} the observables to concatenate
* @params {Scheduler} [scheduler] an optional scheduler to schedule each observable subscription on.
* @returns {Observable} All values of each passed observable merged into a single observable, in order, in serial fashion.
*/
export function concat<R>(...observables: (Observable<any> | Scheduler)[]): Observable<R> {
let args = <any[]>observables;
args.unshift(this);
let scheduler: Scheduler = null;
if (isScheduler(args[args.length - 1])) {
scheduler = args.pop();
}
return new ArrayObservable(args, scheduler).lift(new MergeAllOperator(1));
}
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