build后会产生0kb的css trunk文件 （Build will produce 0 KB CSS trunk file）

[endday]

Version

3.4.0

Reproduction link

https://github.com/endday/test-cli-build

Environment info

Environment Info:

  System:
    OS: Windows 10
    CPU: (4) x64 Intel(R) Core(TM) i5-4460  CPU @ 3.20GHz
  Binaries:
    Node: 8.12.0 - E:\Program Files\nodejs\node.EXE
    Yarn: Not Found
    npm: 6.4.1 - E:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: 42.17134.1.0
  npmPackages:
    @vue/babel-helper-vue-jsx-merge-props:  1.0.0-beta.2
    @vue/babel-plugin-transform-vue-jsx:  1.0.0-beta.2
    @vue/babel-preset-app:  3.4.0
    @vue/babel-preset-jsx:  1.0.0-beta.2
    @vue/babel-sugar-functional-vue:  1.0.0-beta.2
    @vue/babel-sugar-inject-h:  1.0.0-beta.2
    @vue/babel-sugar-v-model:  1.0.0-beta.2
    @vue/babel-sugar-v-on:  1.0.0-beta.2
    @vue/cli-overlay:  3.4.0
    @vue/cli-plugin-babel: ^3.4.0 => 3.4.0
    @vue/cli-service: ^3.4.0 => 3.4.0
    @vue/cli-shared-utils:  3.4.0
    @vue/component-compiler-utils:  2.5.2
    @vue/preload-webpack-plugin:  1.1.0
    @vue/web-component-wrapper:  1.2.0
    vue: ^2.5.22 => 2.5.22
    vue-hot-reload-api:  2.3.1
    vue-loader:  15.6.2
    vue-router: ^3.0.1 => 3.0.2
    vue-style-loader:  4.1.2
    vue-template-compiler: ^2.5.21 => 2.5.22
    vue-template-es2015-compiler:  1.8.2
  npmGlobalPackages:
    @vue/cli: Not Found

Steps to reproduce

npm run build

What is expected?

不会打包出0 kb的css

What is actually happening?

打包出了0kb的css

---

vue-cli-service build

• Building for production...

DONE Compiled successfully in 4944ms15:54:07

File Size Gzipped

dist\js\chunk-vendors.3a345100.js 129.59 KiB 46.06 KiB
dist\js\app.49db33fd.js 6.59 KiB 2.47 KiB
dist\js\about.f152f527.js 2.74 KiB 0.86 KiB
dist\css\app.e4689733.css 0.42 KiB 0.26 KiB
dist\css\about.0e433876.css 0.00 KiB 0.02 KiB

Images and other types of assets omitted.

DONE Build complete. The dist directory is ready to be deployed.
INFO Check out deployment instructions at https://cli.vuejs.org/guide/deployment.html

Process finished with exit code 0