您的validations结构应该镜像data中的对象，因此它应该是：

validations: {
  internalFormData: {
    password: {
      required,
      minLength: minLength(8)
    },
    repassword: {
      required,
      minLength: minLength(8),
      sameAs: sameAs('internalFormData.password')
    }
  }
}

你需要用一个函数来指出你嵌套的属性，就像这样：

data(){return {
 password :{
  new: '',
  newRepeated:''
 }
}},    
validations : {
 password: {
  new : {required},
  newRepeated : {
   required,
   sameAs : sameAs( function(){return this.password.new} )
  }
 }
}

我还建议您看一下这个已关闭的问题。https://github.com/vuelidate/vuelidate/issues/252

版本3示例：

validations () {
    return {
        admin: { 
            type: {
                required
            },
            email: {
                required,
                email
            },
            password: { 
                required, 
                minLength: minLength(10) 
            },
            confirmPassword: { 
                required, 
                sameAs: sameAs(this.admin.password)
            }
        }
    }
}

替换此行：

sameAs: sameAs('internalFormData.password')

与

sameAs: sameAs(this.internalFormData.password)

参数不应是字符串，而应是使用“this”的实际属性。我不确定与数据internalFormData不相同的验证是否会影响其工作方式，但我建议您确保它们匹配，以适应如下所示：

validations: {
  internalFormData: {
    password: {
      required,
      minLength: minLength(8)
    },
    repassword: {
      required,
      minLength: minLength(8),
      sameAs: sameAs(this.internalFormData.password)
    }
  }
}

使用合成API的简单示例：

import { useVuelidate } from '@vuelidate/core'
import { email, required, sameAs } from '@vuelidate/validators'

const form = {
    email: '',
    confirm_email: '',
}
const rules = {
    email: { required, email },
    confirm_email: { required, sameAs(computed(()=> form.email))) },
}
const v$ = useVuelidate(rules, form)

您必须使用.value

sameAs: sameAs('internalFormData.value.password')