使用ValidationGroups和自定义注解来避免在class-validator中重复使用验证器。

示例代码：

import { validate } from 'class-validator';

class User { @IsString() @NotEmpty() name: string;

@IsEmail() @NotEmpty() email: string;

@IsString() @NotEmpty() password: string;

// 自定义验证器 @ValidateIf((o: User) => o.password) @MinLength(8, { message: 'Password must be at least 8 characters long' }) confirmPassword?: string;

// 用ValidationGroups将验证器分组 @ValidateIf((o: User) => o.password && o.confirmPassword) @Equals('confirmPassword', { groups: ['registration'] }) passwordConfirmation?: string; }

// 使用groups参数来指定要应用的验证器组 const user = new User(); user.name = 'John Smith'; user.email = 'john@example.com'; user.password = 'testpassword'; user.passwordConfirmation = 'testpassword'; const errors = await validate(user, { groups: ['registration'] }); console.log(errors); // []