While the lab's modules has JS going back 10+ years, the typescript/react codebase is almost brand new. It might be useful to have a build step that automatically enforces code styling. eslint is one I'm vaguely familiar with, and has some LabKey hooks:
https://github.com/LabKey/labkey-ui-components/blob/develop/packages/eslint-config-base/README.md
I'd be in favor of putting in some tighter restrictions on styling (like var/let/const), etc. Also enforcing a standard code style. Do you have experience with eslint or similar, and can you have a look at this or similar options?