import type { ValidationOptions } from 'class-validator';
import { IsPhoneNumber as isPhoneNumber, ValidationArguments, ValidatorConstraintInterface } from 'class-validator';
/**
 * 验证密码格式（只允许字母、数字和特定特殊字符）
 *
 * @param validationOptions 验证选项
 *
 * @example
 * ```typescript
 * class UserDto {
 *   @IsPassword({ message: 'Invalid password format' })
 *   password: string;
 * }
 * ```
 */
export declare function IsPassword(validationOptions?: ValidationOptions): PropertyDecorator;
/**
 * 验证手机号码（支持指定国家/地区）
 *
 * @param validationOptions 验证选项，可以指定 region
 *
 * @example
 * ```typescript
 * class ContactDto {
 *   @IsPhoneNumber({ region: 'CN' })
 *   phone: string;
 * }
 * ```
 */
export declare function IsPhoneNumber(validationOptions?: ValidationOptions & {
    region?: Parameters<typeof isPhoneNumber>[0];
}): PropertyDecorator;
/**
 * 验证临时文件路径（必须以 tmp/ 开头）
 *
 * @param validationOptions 验证选项
 *
 * @example
 * ```typescript
 * class FileDto {
 *   @IsTmpKey()
 *   filePath: string; // 必须是 'tmp/...'
 * }
 * ```
 */
export declare function IsTmpKey(validationOptions?: ValidationOptions): PropertyDecorator;
/**
 * 允许字段为 undefined，如果不是 undefined 才执行其他验证
 *
 * @param options 验证选项
 *
 * @example
 * ```typescript
 * class UserDto {
 *   @IsUndefinable()
 *   @IsString()
 *   nickname?: string; // undefined 或字符串
 * }
 * ```
 */
export declare function IsUndefinable(options?: ValidationOptions): PropertyDecorator;
/**
 * 允许字段为空值（null、undefined 或空字符串），如果不为空才执行其他验证
 *
 * @param options 验证选项
 *
 * @example
 * ```typescript
 * class UserDto {
 *   @IsEmptyable()
 *   @IsEmail()
 *   email?: string; // 可以为空，或者必须是有效邮箱
 * }
 * ```
 */
export declare function IsEmptyable(options?: ValidationOptions): PropertyDecorator;
/**
 * 允许字段为 null，如果不是 null 才执行其他验证
 *
 * @param options 验证选项
 *
 * @example
 * ```typescript
 * class UserDto {
 *   @IsNullable()
 *   @IsNumber()
 *   age?: number | null; // null 或数字
 * }
 * ```
 */
export declare function IsNullable(options?: ValidationOptions): PropertyDecorator;
/**
 * 验证 HTTP/HTTPS URL
 *
 * @param validationOptions 验证选项
 *
 * @example
 * ```typescript
 * class WebsiteDto {
 *   @IsHttpUrl({ message: 'Invalid URL' })
 *   url: string;
 * }
 * ```
 */
export declare function IsHttpUrl(validationOptions?: ValidationOptions): (object: any, propertyName: string) => void;
/**
 * Validator constraint for AtLeastOneField decorator
 */
export declare class AtLeastOneFieldConstraint implements ValidatorConstraintInterface {
    validate(value: any, args: ValidationArguments): boolean;
    defaultMessage(args: ValidationArguments): string;
}
/**
 * 验证至少提供指定字段中的一个
 *
 * @param properties 要检查的属性名数组
 * @param validationOptions 验证选项
 *
 * @example
 * ```typescript
 * class ContactDto {
 *   @AtLeastOneField(['email', 'phone'], {
 *     message: 'Either email or phone must be provided'
 *   })
 *   email?: string;
 *
 *   phone?: string;
 * }
 * ```
 *
 * @example
 * 使用虚拟字段（推荐用于类级别验证）：
 * ```typescript
 * class ContactDto {
 *   @AtLeastOneField(['email', 'phone'])
 *   _atLeastOne: any; // 虚拟字段用于验证
 *
 *   email?: string;
 *   phone?: string;
 * }
 * ```
 */
export declare function AtLeastOneField(properties: string[], validationOptions?: ValidationOptions): PropertyDecorator;