[@vitejs/plugin-legacy] Polyfills for Symbol make the app break on old browsers

[cdatehortuab]

Describe the bug

I'm using @vitejs/plugin-legacy to target Chrome >= 38, including polyfills so I expect the app work properly in Chrome 38. However, when I run the built app on that browser an error is displayed in the console: "Unhandled promise rejection TypeError: @@toPrimitive must return a primitive value".

In my app, I'm using Axios. One of its classes (AxiosHeaders) defines a [Symbol.iterator] property. So, when Babel transpiles this class, it defines this property calling Symbol.iterator[Symbol.toPrimitive]('string'). This call returns an object, not a primitive value, so the error is thrown.

As you can see in the reproduction, it will happen with any class that defines [Symbol.iterator] (and probably any other property identified for well known Symbol ([Symbol.toPrimitive] for example))

This makes Vite unusable to target those browsers. (Chrome 38 is important because it's the version of the engine running under SmartTVs LG with webOS 3.x, see https://webostv.developer.lge.com/develop/specifications/web-api-and-web-engine#web-engine)

The same code, built with Webpack works fine.

This bug was initially reported on #12844 but it didn't provide a reproduction

Reproduction

https://github.com/cdatehortuab/vite-issue-plugin-legacy

Steps to reproduce

1. Clone the repo https://github.com/cdatehortuab/vite-issue-plugin-legacy
2. Run npm install
3. Run npm run build
4. Run npx vite preview
5. Open the app in Chrome 38

System Info

System:
    OS: macOS 14.7.1
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
    Memory: 19.49 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.11.0 - ~/.nvm/versions/node/v22.11.0/bin/node
    Yarn: 4.5.1 - ~/.nvm/versions/node/v22.11.0/bin/yarn
    npm: 10.9.2 - ~/.nvm/versions/node/v22.11.0/bin/npm
  Browsers:
    Safari: 18.1.1
  npmPackages:
    @vitejs/plugin-legacy: ^6.0.0 => 6.0.0 
    vite: ^6.0.3 => 6.0.3

Used Package Manager

npm

Logs

Click to expand!

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vite v6.0.3 building for production...
✓ 3 modules transformed.
rendering chunks (1)...[@vitejs/plugin-legacy] legacy polyfills: Set(17) {
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dist/assets/index-legacy-DE2YCvsT.js       1.02 kB │ gzip:  0.55 kB
dist/assets/polyfills-legacy-Cesharnc.js  59.12 kB │ gzip: 22.97 kB
dist/index.html                1.57 kB │ gzip: 0.72 kB
dist/assets/index-Bs_Y2buo.js  0.98 kB │ gzip: 0.56 kB
✓ built in 2.64s

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