export declare function isEmpty(value: unknown): boolean;
export declare const validators: {
    /**
     * Presence validates that the value isn't empty
     *
     * @param value
     * @param options
     * @returns
     */
    presence(value: unknown, options?: {
        allowEmpty?: boolean;
        message?: string;
    }): string[];
    length(value: unknown, options?: {
        message?: string;
        is?: number;
        minimum?: number;
        maximum?: number;
        tooShort?: string;
        tooLong?: string;
        wrongLength?: string;
    }): string[];
    numericality(value: unknown, options?: {
        message?: string;
        notValid?: string;
        onlyInteger?: boolean;
        notInteger?: string;
        greaterThan?: number;
        notGreaterThan?: string;
        greaterThanOrEqualTo?: number;
        notGreaterThanOrEqualTo?: string;
        lessThanOrEqualTo?: number;
        notLessThanOrEqualTo?: string;
        equalTo?: number;
        notEqualTo?: string;
        lessThan?: number;
        notLessThan?: string;
        divisibleBy?: number;
        notDivisibleBy?: string;
        odd?: boolean;
        notOdd?: string;
        even?: boolean;
        notEven?: string;
    }): string[];
    datetime(value: unknown, { format, ...options }: {
        format: (date: Date) => string;
        earliest?: string;
        latest?: string;
        tooEarly?: string;
        tooLate?: string;
        dateOnly?: boolean;
        notValid?: string;
        message?: string;
    }): string[];
    regexValidation(value: unknown, options: {
        pattern: RegExp | string;
        message?: string;
        flags?: string;
    } | RegExp | string): string[];
    email(value: unknown, options?: {
        message?: string;
    }): string[];
};