The js file in the public folder is incorrectly converted

[zj9495]

Version

5.0.0-beta.4

Reproduction link

github.com

Environment info

Environment Info:

  System:
    OS: macOS 11.5.2
    CPU: (8) arm64 Apple M1
  Binaries:
    Node: 15.9.0 - ~/.nvm/versions/node/v15.9.0/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 7.19.1 - ~/.nvm/versions/node/v15.9.0/bin/npm
  Browsers:
    Chrome: 93.0.4577.82
    Edge: 93.0.961.47
    Firefox: 91.0.2
    Safari: 14.1.2
  npmPackages:
    @vue/babel-helper-vue-jsx-merge-props:  1.2.1
    @vue/babel-helper-vue-transform-on:  1.0.2
    @vue/babel-plugin-jsx:  1.0.7
    @vue/babel-plugin-transform-vue-jsx:  1.2.1
    @vue/babel-preset-app:  5.0.0-beta.4
    @vue/babel-preset-jsx:  1.2.4
    @vue/babel-sugar-composition-api-inject-h:  1.2.1
    @vue/babel-sugar-composition-api-render-instance:  1.2.4
    @vue/babel-sugar-functional-vue:  1.2.2
    @vue/babel-sugar-inject-h:  1.2.2
    @vue/babel-sugar-v-model:  1.2.3
    @vue/babel-sugar-v-on:  1.2.3
    @vue/cli-overlay:  5.0.0-beta.4
    @vue/cli-plugin-babel: ~5.0.0-beta.4 => 5.0.0-beta.4
    @vue/cli-plugin-eslint: ~5.0.0-beta.4 => 5.0.0-beta.4
    @vue/cli-plugin-router:  5.0.0-beta.4
    @vue/cli-plugin-vuex:  5.0.0-beta.4
    @vue/cli-service: ~5.0.0-beta.4 => 5.0.0-beta.4
    @vue/cli-shared-utils:  5.0.0-beta.4
    @vue/component-compiler-utils:  3.2.2
    @vue/web-component-wrapper:  1.3.0
    eslint-plugin-vue: ^7.6.0 => 7.17.0
    vue: ^2.6.14 => 2.6.14
    vue-eslint-parser:  7.11.0
    vue-hot-reload-api:  2.3.4
    vue-loader:  16.5.0 (15.9.8)
    vue-style-loader:  4.1.3
    vue-template-compiler: ^2.6.14 => 2.6.14
    vue-template-es2015-compiler:  1.9.1
  npmGlobalPackages:
    @vue/cli: Not Found

Steps to reproduce

1. git clone git@github.com:zj9495/vue-cli5-public-folder-issue.git
2. yarn build
3. compare the config.js files in the dist and public folders

What is expected?

the config.js file in the public folder should be copied to the dist folder as it is

What is actually happening?

The content of config.js is converted to void 0;
https://github.com/zj9495/vue-cli5-public-folder-issue/blob/master/public/config.js
https://github.com/zj9495/vue-cli5-public-folder-issue/blob/master/dist/config.js

---

It only happened in @vue/cli 5

[fangbinwei]

It seems config.js was minimized by terser-webpack-plugin

can be fixed by this option

webpack-contrib/copy-webpack-plugin#576