45 lines
1.2 KiB
TypeScript
45 lines
1.2 KiB
TypeScript
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// 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, Writable } from "svelte/store";
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import { Callback, singleCallback } from "../lib/typing";
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import subscribeToUpdates from "./subscribe-updates";
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/**
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* The goal of this action is to turn itself inactive.
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* Once `active` is `true`, it will unsubscribe from `store`.
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*
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* @param active: If `active` is `true`, all stores will be subscribed to.
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* @param stores: If any `store` updates to a true value, active will be set to false.
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*/
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function subscribeTrigger(
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active: Writable<boolean>,
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...stores: Readable<unknown>[]
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): Callback {
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function shouldUnset(): void {
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active.set(false);
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}
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let destroy: Callback | null;
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function doDestroy(): void {
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destroy?.();
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destroy = null;
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}
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active.subscribe((value: boolean): void => {
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if (value && !destroy) {
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destroy = singleCallback(
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...stores.map((store) => subscribeToUpdates(store, shouldUnset)),
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);
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} else if (!value) {
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doDestroy();
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}
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});
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return doDestroy;
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}
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export default subscribeTrigger;
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