interface StorageData { data: T expire: number | null } export function createLocalStorage(options?: { expire?: number | null }) { const DEFAULT_CACHE_TIME = 60 * 60 * 24 * 7 const { expire } = Object.assign({ expire: DEFAULT_CACHE_TIME }, options) function set(key: string, data: T) { const storageData: StorageData = { data, expire: expire !== null ? new Date().getTime() + expire * 1000 : null, } const json = JSON.stringify(storageData) window.localStorage.setItem(key, json) } function get(key: string) { const json = window.localStorage.getItem(key) if (json) { let storageData: StorageData | null = null try { storageData = JSON.parse(json) } catch { // Prevent failure } if (storageData) { const { data, expire } = storageData if (expire === null || expire >= Date.now()) return data } remove(key) return null } } function remove(key: string) { window.localStorage.removeItem(key) } function clear() { window.localStorage.clear() } return { set, get, remove, clear } } export const ls = createLocalStorage() export const ss = createLocalStorage({ expire: null })