Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | 1x 866x 862x 866x 866x 866x 806x 786x 677x 16x 8x 8x | import { Observable, tap } from 'rxjs';
/**
* Operator that will run some predicate only for the first emission, once
* across all subscribers.
*
* @param predicateNext The predicate to run if the first emission is successful
* @param predicateError The predicate to run if the first emission is an error.
* If none specified, the one used when the first emission is successful will
* be used
* @returns The operator
*/
// eslint-disable-next-line @typescript-eslint/no-explicit-any
export const ifFirst = (predicateNext: any, predicateError?: any) => {
if (predicateError === undefined) {
predicateError = predicateNext;
}
let first = true;
return <T>(source: Observable<T>) => {
return source.pipe(
tap({
next: (v) => {
if (first) {
predicateNext(v);
first = false;
}
},
error: (e) => {
if (first) {
predicateError(e);
first = false;
}
},
})
);
};
};
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