interface IStorage {
    getItem(key: string): string | null;
    setItem(key: string, value: string): void;
    removeItem(key: string): void;
}
/**
 * Persistence options to set timeout, storage and placeholder value.
 */
export interface PersistenceOptions<T = any> {
    storage?: IStorage;
    timeout?: number;
    placeholder?: T;
}
/**
 * An object to easily get and set values to a persistent storages like
 * `SessionStorage` and `LocalStorage`.
 */
export interface Persistence<T = any, U = (T | undefined)> {
    /**
     * Set a value to a persistent storage.
     * @param value - Any JSON parseable value can be setted.
     */
    set(value: T): void;
    /**
     * Get value from persistent storage.
     */
    get(): T | U;
    /**
     * Delete value from persistent storage.
     */
    delete(): void;
}
/**
 * Creates a Persistence, an object to easily get and set values to a persistent
 * storage like `SessionStorage` or `LocalStorage`.
 * @example ```js
 * const state = createPersistence('state@name', {
 *   placeholder: 'Unknown'
 * });
 *
 * // This creates a persistent field's value.
 * const el = document.querySelector('input[name="name"]');
 * el.value = state.get();
 * el.addEventListener('input', () => state.set(el.value));```
 * @param name - Persistence uses the name as storage's key.
 * @param options - Options to set timeout, storage and placeholder value.
 */
declare const createPersistence: {
    <T = any, U = T>(name: string, options: PersistenceOptions & {
        placeholder: U;
    }): Persistence<T, U>;
    <T = any, U = (T | undefined)>(name: string, options?: PersistenceOptions<U>): Persistence<T, U>;
};
export default createPersistence;