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You are definitely right. Actally, tsup use esbuild to bundle files.

If target is es5,tsup add a plugin es5 https://github.com/egoist/tsup/blob/dev/src/plugins/es5.ts, and esbuild's target can be configured with es5. https://github.com/egoist/tsup/blob/dev/src/esbuild/index.ts#L172

es3 is not supported with esbuild, that will throw a error.

Error: Invalid target "es3" in "--target=es3"

There are two problems to resolve.

1. add a es3 plugin that use swc to transform code
2. if set es3, which value should be set for esbuild's target.

Some docs for esbuild target. https://esbuild.github.io/api/#target
support list with https://github.com/evanw/esbuild/blob/0b48edaac1b92da4d14d300252304c44821dd2f2/pkg/api/api.go#L124

🎉 This issue has been resolved in version 7.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀