Strange eslint behaviour with worker-loader

[acgrid]

Version

4.0.5

Reproduction link

https://github.com/acgrid/vue-eslint-bug-with-worker-loader

Environment info

  System:
    OS: Windows 10
    CPU: (8) x64 Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
  Binaries:
    Node: 12.13.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.19.1 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
    npm: 6.12.0 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: 44.18362.387.0
  npmPackages:
    @vue/babel-helper-vue-jsx-merge-props:  1.0.0
    @vue/babel-plugin-transform-vue-jsx:  1.0.0
    @vue/babel-preset-app:  4.0.5
    @vue/babel-preset-jsx:  1.1.1
    @vue/babel-sugar-functional-vue:  1.0.0
    @vue/babel-sugar-inject-h:  1.0.0
    @vue/babel-sugar-v-model:  1.1.1
    @vue/babel-sugar-v-on:  1.1.0
    @vue/cli-overlay:  4.0.5
    @vue/cli-plugin-babel: ^4.0.0 => 4.0.5
    @vue/cli-plugin-eslint: ^4.0.0 => 4.0.5
    @vue/cli-plugin-router: ^4.0.0 => 4.0.5
    @vue/cli-plugin-unit-mocha: ^4.0.0 => 4.0.5
    @vue/cli-plugin-vuex: ^4.0.0 => 4.0.5
    @vue/cli-service: ^4.0.0 => 4.0.5
    @vue/cli-shared-utils:  4.0.5
    @vue/component-compiler-utils:  3.0.0
    @vue/eslint-config-standard: ^4.0.0 => 4.0.0
    @vue/preload-webpack-plugin:  1.1.1
    @vue/test-utils: 1.0.0-beta.29 => 1.0.0-beta.29
    @vue/web-component-wrapper:  1.2.0
    eslint-plugin-vue: ^5.0.0 => 5.2.3
    vue: ^2.6.10 => 2.6.10
    vue-async-computed: ^3.7.0 => 3.7.0
    vue-eslint-parser:  5.0.0
    vue-hot-reload-api:  2.3.4
    vue-loader:  15.7.1
    vue-router: ^3.1.3 => 3.1.3
    vue-style-loader:  4.1.2
    vue-template-compiler: ^2.6.10 => 2.6.10
    vue-template-es2015-compiler:  1.9.1
    vuex: ^3.0.1 => 3.1.1
  npmGlobalPackages:
    @vue/cli: Not Found

Steps to reproduce

1. yarn && yarn serve, no eslint warnings emiited
2. Edit worker/test.js (a comment with bad indent already) arb
3. A message like Compiled with 0 warnings/errors will be displayed in CLI

What is expected?

When importing with worker-loader:
Proper eslint message shall be output after dev server is started.
Exactly warnings or errors shall be output if.

What is actually happening?

No eslint messages are emitted when cold startup.
No detail messages are emitted when hot compiling.

---

worker-loader is using webpack's loader syntax. This bug will not exist if such syntax is not used however the worker script will not work properly.

[acgrid]

Closing now, for the reproducing repo seems to behave as bundling error then after restarting. I will try to integrate with this loader without such syntax to bypass this issue.

See https://github.com/acgrid/web-worker-in-webpack-demo for who is interesting in this issue.
However, CLI serve is still hiding warnings and errors in worker script.