Code first

// 

   http://eslint.org/docs/rules/  Parsing error: Unexpected token

  10 | @Component
  11 | export default class HelloWorld extends Vue {
> 12 |     private msg: string = "Welcome to Your Vue.js App"
     |             ^
  13 |     private defaultOpen: Array<string> = []
  14 |     private get mmsg () : string {
  15 |         return "ok ok is ok"  
  src/components/HelloWorld.vue:19:12
      private msg: string = "Welcome to Your Vue.js App"
              ^


 1 problem (1 error, 0 warnings)


Errors:
  1  http://eslint.org/docs/rules/null

You may use special comments to disable some warnings.
Use // eslint-disable-next-line to ignore the next line.
Use /* eslint-disable */ to ignore all warnings in a file.
 warning  in ./src/main.ts

// .eslintrc.js
module.exports = {
    root: true,
    parserOptions: {
        parser: "babel-eslint"
    },
    env: {
        browser: true,
    },
    extends: [
        // https://github.com/vuejs/eslint-plugin-vue-sharppriority-a-essential-error-prevention
        // consider switching to `plugin:vue/strongly-recommended` or `plugin:vue/recommended` for stricter rules.
        "plugin:vue/essential",
        // https://github.com/standard/standard/blob/master/docs/RULES-en.md
        "standard"
    ],
    // required to lint *.vue files
    plugins: [
        "vue"
    ],
    // add your custom rules here
    rules: {
        // allow async-await
        "generator-star-spacing": "off",
        // allow debugger during development
        "no-debugger": process.env.NODE_ENV === "production" ? "error" : "off",
        "indent": ["error", 4, {
            SwitchCase: 1
        }],
    }
}

of course, this warning will not block the running of the program, and removing private will not pop up the warning. But why do I warn when I add private ?