import { FieldType, ValidationRule } from '../types';
export declare const validators: {
    required: (value: any) => ValidationRule | null;
    minLength: (min: number) => (value: string) => ValidationRule | null;
    maxLength: (max: number) => (value: string) => ValidationRule | null;
    pattern: (fieldType: FieldType) => (value: string) => ValidationRule | null;
    creditCardLuhn: (value: string) => ValidationRule | null;
    passwordStrength: (requirements: {
        minLength?: number;
        uppercase?: number;
        lowercase?: number;
        numbers?: number;
        specialChars?: number;
    }) => (value: string) => ValidationRule | null;
    custom: (validator: (value: any) => string | null) => (value: any) => ValidationRule | null;
};