import { ValidatorConstraintInterface, ValidationArguments } from 'class-validator';
import { UserService } from 'modules/user/users.service';
export declare class ReferralMailValidator implements ValidatorConstraintInterface {
    private readonly userService;
    private readonly logger;
    constructor(userService: UserService);
    validate(referralMail: string, args: ValidationArguments): Promise<boolean>;
    defaultMessage(): string;
}