import { ValidationArguments, ValidationOptions, ValidatorConstraintInterface } from 'class-validator';
import { UsersService } from '../services/users.service';
export declare class UserExistsConstraintValidator implements ValidatorConstraintInterface {
    private readonly usersService;
    constructor(usersService: UsersService);
    validate(userId: string | undefined): Promise<boolean>;
    defaultMessage(args: ValidationArguments): string;
}
export declare const ValidateUserExists: (validationOptions?: ValidationOptions) => (object: object, propertyName: string) => void;