/**
 * Get random element from array or string.
 * @param {Array|string} arr source
 * @returns array element or string character
 */
export function randomElement(arr: any[] | string): any;
/**
 * Generate random alphanumeric string.
 * @param {number} length expected string length
 * @returns {string} random string of specified length
 */
export function randomAlphanumStr(length: number): string;
/**
 * Generates random int within the range [min, max]
 * @param min the minimum value for the generated number
 * @param max the maximum value for the generated number
 * @returns random int number
 */
export function randomInt(min: any, max: any): any;
/**
 * Returns a random hex digit.
 * @returns {*}
 */
export declare function randomHexDigit(): any;
/**
 * Returns a random hex digit.
 * @returns {*}
 */
export declare function randomHexDigit(): any;
/**
 * Returns a random string of hex digits with length 'len'.
 * @param len the length.
 */
export declare function randomHexString(len: any): string;
/**
 * Returns a random string of hex digits with length 'len'.
 * @param len the length.
 */
export declare function randomHexString(len: any): string;