Created
May 18, 2020 14:46
RxJS custom operator to debounce a stream for set time after first value is emitted.
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/** | |
* Debounce after first emit. | |
* This operator will debounce all requests apart from the first for a set duration. | |
* @param ms time to wait in milliconds. | |
*/ | |
const debounceAfterFirst = <T,>(ms: number) => (source: Observable<T>) => { | |
return source.pipe( | |
map((val: T, index: number) => ({ val, index } as { index: number; val: T })), | |
debounce(({ index }) => timer(index === 0 ? 0 : ms)), | |
map(({ val }) => val) | |
); | |
}; |
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