gristlabs_grist-core/app/client/lib/localStorageObs.ts

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