export default class Store<T> {
    private storeName;
    private defaultValue;
    constructor(storeName: string, defaultValue: T);
    get(): T;
    getKey(key: keyof T): T[keyof T];
    set(mergeValues: Partial<T>): T;
    replace(newValue: T): T;
    upgrade(...upgradeFns: Array<(data: Partial<T>) => Partial<T>>): void;
}