22 lines
545 B
JavaScript
22 lines
545 B
JavaScript
import { id, registerSubscriptions, registerFire } from './util.js';
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export function prop(store, hash = id) {
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let subscribers = [];
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let oldId = hash(store);
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const accessor = function _prop(newVal) {
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const newId = hash(newVal);
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if (newVal !== undefined && oldId !== newId) {
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oldId = newId;
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store = newVal;
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accessor.fire(store);
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}
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return store;
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};
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accessor.subscribe = registerSubscriptions(subscribers);
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accessor.fire = registerFire(subscribers);
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accessor.unsubscribeAll = () => (subscribers = []);
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return accessor;
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}
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