mirror of
https://github.com/bitwarden/browser
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c3e562e75d
* [PM-17563] Remove references to Angular from TaskService * [PM-17563] Move Task module to libs/common/vault to avoid Angular dependency * [PM-17563] Fix bad imports * [PM-17563] Fix a few more missed imports
38 lines
1.2 KiB
TypeScript
38 lines
1.2 KiB
TypeScript
import { filter, Observable, OperatorFunction, shareReplay } from "rxjs";
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import { UserId } from "@bitwarden/common/types/guid";
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/**
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* Builds an observable once per userId and caches it for future requests.
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* The built observables are shared among subscribers with a replay buffer size of 1.
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* @param create - A function that creates an observable for a given userId.
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*/
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export function perUserCache$<TValue>(
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create: (userId: UserId) => Observable<TValue>,
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): (userId: UserId) => Observable<TValue> {
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const cache = new Map<UserId, Observable<TValue>>();
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return (userId: UserId) => {
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let observable = cache.get(userId);
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if (!observable) {
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observable = create(userId).pipe(shareReplay({ bufferSize: 1, refCount: false }));
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cache.set(userId, observable);
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}
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return observable;
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};
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}
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/**
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* Strongly typed observable operator that filters out null/undefined values and adjusts the return type to
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* be non-nullable.
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*
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* @example
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* ```ts
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* const source$ = of(1, null, 2, undefined, 3);
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* source$.pipe(filterOutNullish()).subscribe(console.log);
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* // Output: 1, 2, 3
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* ```
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*/
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export function filterOutNullish<T>(): OperatorFunction<T | undefined | null, T> {
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return filter((v): v is T => v != null);
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}
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