Function names not minified

[arwinvdv]

Describe the bug

I'm using vite-plugin-vue to build my Vue 3 app and I noticed that the function names are not minified in the production build. This increases the bundle size and exposes some implementation details that I would rather keep hidden. I checked the vite.config.js file and I have minify: 'terser' set as an option, but it doesn't seem to have any effect on the function names. Is this a bug or a limitation of the plugin? Is there any way to enable function name minification with vite-plugin-vue?

I created a example repo, here the changes to recreate: arwinvdv/vue3-template@18c6cb8

Reproduction

https://github.com/arwinvdv/vue3-template

Steps to reproduce

Checkout this repo: https://github.com/arwinvdv/vue3-template

Run:

npm install
npm run build

In the created js file the functions customFunctionThatIsNotMinified and anotherCustomFunctionThatIsNotMinified are visible.

System Info

System:
    OS: macOS 13.3.1
    CPU: (10) arm64 Apple M1 Max
    Memory: 66.70 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 18.9.1 - ~/.nvm/versions/node/v18.9.1/bin/node
    Yarn: 1.22.19 - ~/.nvm/versions/node/v18.9.1/bin/yarn
    npm: 8.19.1 - ~/.nvm/versions/node/v18.9.1/bin/npm
  Browsers:
    Chrome: 113.0.5672.63
    Edge: 112.0.1722.68
    Firefox: 112.0.2
    Safari: 16.4
  npmPackages:
    @vitejs/plugin-vue: ^4.0.0 => 4.2.1 
    vite: ^4.1.4 => 4.3.5

Used Package Manager

npm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[sapphi-red]

esbuild and terser both have an option to do that but it has some caveats.
https://esbuild.github.io/api/#mangle-props

[arwinvdv]

@sapphi-red Thanks for the response!

I tried in esbuild and terser both with this configuration in vite.config.js, but unfortunately no difference:

{ 
    build: {
      minify: 'terser',
      terserOptions: {
        mangle: {
          toplevel: true,
          module: true,
          properties: {
            regex: /^_/,
        },
      },
      compress: {
          drop_console: true,
          drop_debugger: true,
      },
    },
  },
}

And with esbuild:

{
  esbuild: {
    mangleProps: /_$/
  },
  build: {
    minify: 'esbuild'
  }
}

[sapphi-red]

You have to rename your properties/methods to match that regexes.