with the fact that we have webserver dat, & many components have been released by the community are based on web technologies ( @tblankensmith mediapipe & shaderpark components spring to mind ), it would be very useful to have Javascript/typescript available as a language in the textdat dropdowns. this would make developing with these languages in touchdesigner a lot easier.
Python is the scripting language for TD, & is first party citizen within this software. this feature request is not trying to change that. that being said having basic syntax highlighting for javascript would not only make it easier to develop with these languages in TD, but would also signal to other users the possibility of being able to use these languages to create experiences in TD.