export declare function notNullNotUndefined<T>(v: T): v is NonNullable<T>;
/**
 * Maps a given function over the entries of an object.
 * @param obj The object to map over.
 * @param f The function to map over the object's entries.
 * @returns Object containing the mapped values.
 */
export declare function mapObject<V, W, T extends Record<string, V>>(obj: T, f: (key: string, value: V) => W): Record<string, W>;