/**
 * Check if objects are null or undefined
 * @param args Objects to check
 * @returns true if ALL objects are neither null, nor undefined.
 */
export declare function notNU(...args: (any | null | undefined)[]): boolean;
/**
 * Convenient function to go through objects.
 * @param o The object
 * @param cb The callback function
 */
export declare function forIn<T>(o: {
    [key: string]: T;
}, cb: (value: T, key: string) => void): void;