• Rollup Plugin Name: @rollup/plugin-typescript
• Rollup Plugin Version: 12.1.1
• Rollup Version: 4.27.4
• Operating System (or Browser): MacOS
• Node Version: 23.3.0
• Link to reproduction (⚠️ read below): https://stackblitz.com/edit/rollup-repro-urjbuk?file=dist%2Fmain.js

Expected Behavior

Using the new rewriteRelativeImportExtension option introduced in TypeScript 5.7 should work with dynamic imports.

Actual Behavior

If rewriteRelativeImportExtension: true is set in the TS config, a dynamic import() in a .ts source will have its argument wrapped with a __rewriteRelativeImportExtension() helper function, but the helper function itself is not included in the compiled output.

Additional Information

Building the same file with just tsc works, and includes the helper in the output.