export default class DFWUtils {
    static readonly EMAIL_REGEX: RegExp;
    static isEmail(email: string): boolean;
    /**
     *
     * @param duration ms of sleeping
     */
    static sleepAsync(duration: number): Promise<any>;
    /**
     *
     */
    static randomHexString(len: number): string;
    /**
     *
     */
    static uuid(): string;
}