/**
 * Checks if an argument is an array
 * @param arg - parameter which should be verified
 */
export declare function isArray<T>(arg: any): boolean;
/**
 * Checks if an argument is not an array
 * @param arg - parameter which should be verified
 */
export declare function isNotArray<T>(arg: any): boolean;
/**
 * Checks if an array is empty
 * @param arg - array which should be checked
 */
export declare function isEmptyArray<T>(arg: T[]): boolean;
/**
 * Checks if an array is not empty
 * @param arg - array which should be checked
 */
export declare function isNotEmptyArray<T>(arg: T[]): boolean;
/**
 * Checks if all values in an array are equal
 * @param arg - array which should be checked
 */
export declare function allValuesInArrayAreEqual(arg: any[]): boolean;
/**
 * Checks if all values in an array are not equal
 * @param arg - array which should be checked
 */
export declare function allValuesInArrayAreNotEqual(arg: any[]): boolean;