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import { OperatorFunction, ObservableInputTuple } from '../types';
import { raceInit } from '../observable/race';
import { operate } from '../util/lift';
import { identity } from '../util/identity';
/**
* Creates an Observable that mirrors the first source Observable to emit a next,
* error or complete notification from the combination of the Observable to which
* the operator is applied and supplied Observables.
*
* ## Example
*
* ```ts
* import { interval, map, raceWith } from 'rxjs';
*
* const obs1 = interval(7000).pipe(map(() => 'slow one'));
* const obs2 = interval(3000).pipe(map(() => 'fast one'));
* const obs3 = interval(5000).pipe(map(() => 'medium one'));
*
* obs1
* .pipe(raceWith(obs2, obs3))
* .subscribe(winner => console.log(winner));
*
* // Outputs
* // a series of 'fast one'
* ```
*
* @param otherSources Sources used to race for which Observable emits first.
* @return A function that returns an Observable that mirrors the output of the
* first Observable to emit an item.
*/
export function raceWith<T, A extends readonly unknown[]>(
...otherSources: [...ObservableInputTuple<A>]
): OperatorFunction<T, T | A[number]> {
return !otherSources.length
? identity
: operate((source, subscriber) => {
raceInit<T | A[number]>([source, ...otherSources])(subscriber);
});
}