export declare class Arr {
    /**
     * Returns whether the given array has elements
     * @param  {any[]}   arr The array to check
     * @return {boolean}     True if the array has elements, otherwise false
     */
    static hasElements(arr: any[]): boolean;
    /**
     * Returns whether the array is of the given length
     * @param  {any[]}   arr    The array to check
     * @param  {number}  length The target length
     * @return {boolean}        True if the array is of the given length, otherwise false
     */
    static isOfLength(arr: any[], length: number): boolean;
    /**
     * Returns whether the given array is empty
     * @param  {any[]}   arr The array to check
     * @return {boolean}     True if the array is empty, otherwise false
     */
    static isEmpty(arr: any[]): boolean;
    /**
     * Returns whether the given object is an array
     * @param  {any}     obj The object to check
     * @return {boolean}     True if the object is an array, otherwise false
     */
    static isArray(obj: any): boolean;
}