One major thing to consider when thinking about replacing JS with another language: All JS already works inside TS so it's really easy to slowly transition you

One major thing to consider when thinking about replacing JS with another language: All JS already works inside TS so it's really easy to slowly transition your project over time between the two languages without losing any functionality or needing to take time off to make the transition. In practice this means, new code can just be written with TS and any existing code updates can be made in TS. After that you can decide whether to even touch the remaining JS which still works.