Vue项目遇TS2339错误：类型'{ submit(): Promise<void>; }'无last_name属性

前端领域新手，在Vue项目中编写了如下代码，期望从.vue文件中获取first_name、last_name等数据，通过axios提交到指定URL，但出现错误提示：

TS2339:Property 'last_name' does not exist on type '{ submit(): Promise; }'

代码示例 #

export default {
  name: "Register",
  data() {
    return {
      first_name: '',
      last_name: '',
      email: '',
      password: '',
      password_confirm: '',
    }
  },
  methods: {
    async submit() {
      await axios.post('addr', {
        first_name: this.first_name,
        last_name: this.last_name,
        email: this.email,
        password: this.password,
        password_confirm: this.password_confirm,
      });
      await this.$router.push('/login');
    }
  }
}

错误提示截图 #

内容的提问来源于stack exchange，提问作者amirpny