Right now, Rolldown is dual-published - but switching to ESM-only publishing would be beneficial:

• No Dual Publishing Hazard (see fix: replace_plugin does not work as expected with .ts config #5920 (comment))
• ESM is supported in all non-EOL Node versions (and can be used via require(esm) if cjs is necessary)
• Vite is also ESM-only.

See #6025