Typescript+Vue, is defined in the attribute value of Vue.prototype, and an error will be reported on the instance TS.

problem description

I am the first time to use Vue+typescript to organize a project, and now I encounter a problem, that is, I mount the encapsulated axios to Vue.prototype, and there is no problem in using it, but TS will make an error?

related codes

/ / Please paste the code text below (do not replace the code with pictures)

import api from "./http/api/index";  //api
Vue.prototype.$api = api;


export default class BusinessUser extends Vue {
  //http
    search(): void {
    this.$api.user.getMsg("UK1810000001")
    console.log(this);
  }

TS error will be reported here
Property"$api" does not exist on type "BusinessUser".

I would like to ask the god how to solve this problem.
but you can still send the request normally and get the requested data

Prototype typescript vue.js

Apr.23,2021

declare module 'vue/types/vue' {
  interface Vue {
    $axios: AxiosInstance
    $dict: Dict
    $utils: object
  }
}

the answer on the first floor is feasible. Create a new .d.ts file and put it in the src/ directory. If you still report something wrong, just turn off ied, and restart ide. I use vscode

declare module 'vue/types/vue' {
  interface Vue {
    $axios: AxiosInstance
    $dict: Dict
    $utils: object
  }
}

ide/typescript.html-sharp%E5%A2%9E%E5%BC%BA%E7%B1%BB%E5%9E%8B%E4%BB%A5%E9%85%8D%E5%90%88%E6%8F%92%E4%BB%B6%E4%BD%BF%E7%94%A8" rel=" nofollow noreferrer "> https://cn.vuejs.org/v2/guide.

https://blog.csdn.net/qq_2474.
there is an item in this table. There are some examples. I have said that I can

item: https://github.com/wowill/vue.

I really can't add / / @ ts-ignore . I've tried the previous "useful" method, but restarting vscode still won't work. If anyone has a better way, please let me know.

Thank you for the answer from layer 2L.
although it has been a long time, by the way, it saves some people the same detours. Two key points:

src directory. (if you write it in shims-vue, it will cause an error in main.ts.)
restart IDE (vscode). If you do not restart, there are occasional problems that do not take effect

the answer to the landlord is as follows:

import VueRouter, { Route } from 'vue-router'
// 
declare module 'vue/types/vue' {
  interface Vue {
    $router: VueRouter;
    $route: Route;
    $api: any;
  }
}

Previous: Angular6 this pointing to the problem

Next: How does vue-property-decorator @ prop define Array