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20 lines
751 B
20 lines
751 B
4 years ago
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import {Observable} from 'grainjs';
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/**
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* Helper to create a boolean observable whose state is stored in localStorage.
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*/
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export function localStorageBoolObs(key: string): Observable<boolean> {
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const obs = Observable.create(null, Boolean(localStorage.getItem(key)));
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obs.addListener((val) => val ? localStorage.setItem(key, 'true') : localStorage.removeItem(key));
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return obs;
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}
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/**
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* Helper to create a string observable whose state is stored in localStorage.
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*/
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export function localStorageObs(key: string): Observable<string|null> {
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const obs = Observable.create<string|null>(null, localStorage.getItem(key));
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obs.addListener((val) => (val === null) ? localStorage.removeItem(key) : localStorage.setItem(key, val));
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return obs;
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}
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