Lint errors are not showing when serving

[Rolanddoda]

Version

4.1.1

Reproduction link

https://github.com/Rolanddoda/vue-cli-issue

Environment info

Details

  System:
    OS: Windows 10 10.0.18362
  Binaries:
    Node: 12.13.0 
    Yarn: 1.19.1 
    npm: 6.13.1
npmPackages:

@vue/babel-helper-vue-jsx-merge-props:  1.0.0

@vue/babel-plugin-transform-vue-jsx:  1.1.2

@vue/babel-preset-app:  4.1.1

@vue/babel-preset-jsx:  1.1.2

@vue/babel-sugar-functional-vue:  1.1.2

@vue/babel-sugar-inject-h:  1.1.2

@vue/babel-sugar-v-model:  1.1.2

@vue/babel-sugar-v-on:  1.1.2

@vue/cli-overlay:  4.1.1

@vue/cli-plugin-babel: ^4.1.0 => 4.1.1

@vue/cli-plugin-eslint: ^4.1.0 => 4.1.1

@vue/cli-plugin-router:  4.1.1

@vue/cli-plugin-vuex:  4.1.1

@vue/cli-service: ^4.1.0 => 4.1.1

@vue/cli-shared-utils:  4.1.1

@vue/component-compiler-utils:  3.0.2

@vue/eslint-config-prettier: ^5.0.0 => 5.1.0

@vue/preload-webpack-plugin:  1.1.1

@vue/web-component-wrapper:  1.2.0

eslint-plugin-vue: ^5.0.0 => 5.2.3

vue: ^2.6.10 => 2.6.10

vue-eslint-parser:  5.0.0

vue-hot-reload-api:  2.3.4

vue-loader:  15.7.2

vue-style-loader:  4.1.2

vue-template-compiler: ^2.6.10 => 2.6.10

vue-template-es2015-compiler:  1.9.1

npmGlobalPackages:

@vue/cli: Not Found

Steps to reproduce

• Clone the repo
• npm install
• npm run serve (See the lint errors there)
• stop the serve
• npm run serve

After npm install, when you run npm run serve, lint errors are shown.

But that happens only the first time.

What is expected?

npm run serve should always show lint errors.

What is actually happening?

Every time after, npm run serve will not show lint errors.

---

It seems that the npm run serve shows lint errors from files that are actually in git changes and not all the files that are presented in the app.

So if you manually create a lint error, it will show in the terminal. But if you commit the lint error, stop the server and re-run the server then the lint error will not show.

Of course, npm run serve should show all errors disregarding if they are already committed or not.

[haoqunjiang]

Duplicate of #3065 and contributions are welcome.