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subsequent.ts
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subsequent.ts
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/**
* @license Use of this source code is governed by an MIT-style license that
* can be found in the LICENSE file at https://github.com/cartant/rxjs-etc
*/
import {
concat,
MonoTypeOperatorFunction,
Observable,
OperatorFunction,
} from "rxjs";
import { publish, take } from "rxjs/operators";
export function subsequent<T, R>(
count: number,
operator: (source: Observable<T>) => Observable<R>
): OperatorFunction<T, T | R>;
export function subsequent<T>(
count: number,
operator: (source: Observable<T>) => Observable<T>
): MonoTypeOperatorFunction<T>;
export function subsequent<T, R>(
operator: (source: Observable<T>) => Observable<R>
): OperatorFunction<T, T | R>;
export function subsequent<T>(
operator: (source: Observable<T>) => Observable<T>
): MonoTypeOperatorFunction<T>;
export function subsequent<T, R>(
countOrOperator: number | ((source: Observable<T>) => Observable<R>),
operator?: (source: Observable<T>) => Observable<R>
): OperatorFunction<T, T | R> {
let count: number;
if (typeof countOrOperator === "number") {
count = countOrOperator;
} else {
count = 1;
operator = countOrOperator;
}
return (source) =>
source.pipe(
publish((published) =>
concat(published.pipe(take(count)), published.pipe(operator!))
)
);
}