/**
 * Allows you to save and restore any kind of information related to your application.
 */
/**
* Checks whether such a key exists.
* @param key The key to check for.
*/
export function hasKey(key: string): boolean;

/**
* Gets a value (if existing) for a key as a Boolean Object. A default value can be provided in case there is no existing value.
* @param key The key to check for.
* @param defaultValue An optional value to be returned in case there is no existing value.
*/
export function getBoolean(key: string, defaultValue?: boolean): boolean;

/**
* Gets a value (if existing) for a key as a String Object. A default value can be provided in case there is no existing value.
* @param key The key to check for.
* @param defaultValue An optional value to be returned in case there is no existing value.
*/
export function getString(key: string, defaultValue?: string): string;

/**
* Gets a value (if existing) for a key as a Number Object. A default value can be provided in case there is no existing value.
* @param key The key to check for.
* @param defaultValue An optional value to be returned in case there is no existing value.
*/
export function getNumber(key: string, defaultValue?: number): number;

/**
* Sets a Boolean Object for a key.
* @param key The key.
* @param value The value.
*/
export function setBoolean(key: string, value: boolean): void;

/**
* Sets a String Object for a key.
* @param key The key.
* @param value The value.
*/
export function setString(key: string, value: string): void;

/**
* Sets a Number Object for a key.
* @param key The key.
* @param value The value.
*/
export function setNumber(key: string, value: number): void;

/**
* Removes a value (if existing) for a key.
* @param key The key to check for.
*/
export function remove(key: string): void;

/**
 * Removes all values.
 */
export function clear(): void;
