41 lines
945 B
TypeScript
41 lines
945 B
TypeScript
// Copyright: Ankitects Pty Ltd and contributors
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// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
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import type { Readable, Unsubscriber } from "svelte/store";
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interface StoreAccessors {
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subscribe: () => void;
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unsubscribe: () => void;
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}
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// Prevent double subscriptions / unsubscriptions
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function storeSubscribe<T>(
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store: Readable<T>,
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callback: (value: T) => void,
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start = true,
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): StoreAccessors {
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function subscribe(): Unsubscriber {
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return store.subscribe(callback);
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}
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let unsubscribe: Unsubscriber | null = start ? subscribe() : null;
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function resubscribe(): void {
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if (!unsubscribe) {
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unsubscribe = subscribe();
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}
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}
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function doUnsubscribe() {
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unsubscribe?.();
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unsubscribe = null;
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}
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return {
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subscribe: resubscribe,
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unsubscribe: doUnsubscribe,
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};
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}
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export default storeSubscribe;
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