vue-cli-plugin-templates/generator/typescript/src/types/vue.d.ts

vue-cli 3 plugin to add @shiyaping/vue-template | @shiyapings/vue-typescript-template

import Vue from 'vue'

declare module 'vue/types/vue' {
  interface Vue {
    $axios: any
    $api: any
    $constants: any
    $utils: any
  }
}