File size: 877 Bytes
2517be1 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | import { browser } from '$app/environment';
type PersistedValue<T> = {
get value(): T;
set value(newValue: T);
};
export function persisted<T>(key: string, initialValue: T): PersistedValue<T> {
let value = initialValue;
if (browser) {
try {
const stored = localStorage.getItem(key);
if (stored !== null) {
value = JSON.parse(stored) as T;
}
} catch (error) {
console.warn(`Failed to load ${key}:`, error);
}
}
const persist = (next: T) => {
if (!browser) {
return;
}
try {
if (next === null || next === undefined) {
localStorage.removeItem(key);
return;
}
localStorage.setItem(key, JSON.stringify(next));
} catch (error) {
console.warn(`Failed to persist ${key}:`, error);
}
};
return {
get value() {
return value;
},
set value(newValue: T) {
value = newValue;
persist(newValue);
}
};
}
|