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export interface LocalStore<T> {
load(): T | null;
save(value: T): void;
clear(): void;
}
export interface CreateLocalStoreOptions {
storage?: Storage | undefined;
}
function createNoopStore<T>(): LocalStore<T> {
return {
load() {
return null;
},
save() {},
clear() {},
};
}
export function createLocalStore<T>(key: string, opts?: CreateLocalStoreOptions): LocalStore<T> {
let storage: Storage | undefined;
if (opts !== undefined && "storage" in opts) {
storage = opts.storage;
} else {
storage = globalThis.localStorage;
}
if (storage === undefined || storage === null) {
return createNoopStore<T>();
}
return {
load(): T | null {
try {
const raw = storage.getItem(key);
if (raw === null) {
return null;
}
return JSON.parse(raw) as T;
} catch {
return null;
}
},
save(value: T): void {
try {
storage.setItem(key, JSON.stringify(value));
} catch {
// Swallow quota / write errors — persistence is best-effort.
}
},
clear(): void {
storage.removeItem(key);
},
};
}
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