[BABEL] Note: The code generator has deoptimised the styling of undefined as it exceeds the max of 500KB.

[ikangjie]

Describe the bug

I configured build.chunkSizeWarningLimit = 5000 in vite.config.js to eliminate the warning that the package size exceeds 500kb, but it still reports an error when packaging, why is this?

vite version：2.9.5

Reproduction

empty

System Info

System:
    OS: macOS
  Binaries:
    Node: 16.14.2 - ~/Library/pnpm/node
    npm: 8.5.0 - ~/Library/pnpm/npm
  Browsers:
    Brave Browser: 100.1.37.114
    Chrome: 100.0.4896.127
    Safari: 15.3

Used Package Manager

pnpm

Logs

ERROR  [BABEL] Note: The code generator has deoptimised the styling of undefined as it exceeds the max of 500KB.

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 https://github.com/vuejs/core instead.
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• The provided reproduction is a minimal reproducible example of the bug.

[bluwy]

The warning comes from babel and @vitejs/plugin-legacy and can be safely ignored. If you want to improve performance (as noted in the warning), manually set the modernPolyfills config so that babel doesn't have to scan itself.

If you'd like to find what babel scan by default, start your build like DEBUG="vite:legacy" npm run build and it would log the modernPolyfills found.