@vitejs/plugin-legacy chunk name is't working with config?

[richerfu]

Describe the bug

legacy 's chunk files name can't been changed with rollupOptions.output.entryFileNames or rollupOptions.output.chunkFileNames

Reproduction

https://stackblitz.com/edit/vitejs-vite-gwsdqz?file=vite.config.ts&terminal=dev

Steps to reproduce

1. npm run install
2. npm run build

I think it shoule be test.[hash:10].js,but with -legacy.

// this config worked.
entryFileNames: 'test-[name].[hash:10].js'

// this config not work
entryFileNames: info => {
          if (info.name === 'polyfills') {
            return '[name].[hash:10].js';
          }
          return 'test.[hash:10].js';
}

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 16.14.2 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 7.17.0 - /usr/local/bin/npm
  npmPackages:
    @vitejs/plugin-legacy: ^3.0.1 => 3.0.1 
    vite: ^4.0.0 => 4.0.3

Used Package Manager

npm

Logs

No response

Validations

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• The provided reproduction is a minimal reproducible example of the bug.