declare class Storage {
    private GOOGLE_CHROME_STORAGE;
    private LOCAL_STORAGE;
    private storageMethod;
    constructor(type: string);
    set(key: string, value: string, callback?: () => void): void;
    get(keys: string | string[] | null, callback?: (arg: any) => void): void;
    getAll(callback?: (args: any) => void): void;
    remove(keys: string | string[], callback?: () => void): void;
    clear(callback?: () => void): void;
}
export default Storage;