/**
 * Use web worker to execute fn on other thread
 * reference: https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API
 *
 * @param executeFn
 * function to execute
 * inside the function can call self.postMessage(data) to emit data
 *
 * @param callback
 * callback.fn will be execute when [executeFn] emit data
 *
 * @param workerTimeout
 * timeout in milliseconds for worker to terminate
 *
 * ! remember to terminate worker
 *   if no callback is provider or callback.terminateAfterCallback set to false,
 *   Not terminate worker will not release browser/computed resource
 */
declare function startWebworker(executeFn: () => void, callback?: {
    fn: (data: unknown, worker: Worker) => void;
    terminateAfterCallback: boolean;
}, timeout?: number): Worker;
/**
 * Storage key will be used as key in LocalStorage
 * Beware when changing value !
 */
type StorageKey = "feedme_locale" | "feedme_country" | "feedme_business" | "feedme_restaurant";
declare const localStorage: {
    get(key: StorageKey, fallback?: string): string | undefined;
    set(key: StorageKey, value: string): void;
    remove(key: StorageKey): void;
};
export { localStorage, startWebworker };