If anyone is keen to try a PR you should modify this line to pop off the extension: https://github.com/redwoodjs/redwood/blob/0dc1afe90bec6276e6ac363f759f0cb673bac7dc/packages/core/src/babel-plugin-redwood-import-dir.ts#L60
And when you run the tests:
cd packages/core
yarn test:watch
The result should be that this output file should no longer contain extensions:
https://github.com/redwoodjs/redwood/blob/0dc1afe90bec6276e6ac363f759f0cb673bac7dc/packages/core/src/tests/fixtures/import-dir/import-dir-default/output.js#L1-L7
No rush though, I’ll make sure to do this before the end of the day.