@IWANABETHATGUY These are the things I noticed.

• instead of preserveSignatures option, output.preserveSignatures is used
• panics with an edge case: https://stackblitz.com/edit/rolldown-rolldown-starter-stackblitz-dm2hprf1?file=src%2Ffoo.js,src%2Fentry.js
• exports from dynamically imported chunks are removed (it should be preserved): https://stackblitz.com/edit/rolldown-rolldown-starter-stackblitz-3pzh2eg8?file=src%2Ffoo.js,src%2Fentry.js
• preserveSignatures for emitFile is not supported yet

Originally posted by @sapphi-red in #3500