export declare function useForageItem<T>(key: string, isValid: (x: unknown) => boolean, defaultValue: T, onLoad?: (x: T) => void): {
    isLoading: boolean;
    item: T;
    set: (value: T | ((x: T) => T)) => void;
    resync: () => Promise<unknown>;
};
export declare function getForageItem<T>(key: string, isValid: (x: unknown) => x is T, defaultValue: T): Promise<T>;