it taking up more of an app's code doesn't mean that it suddenly has a need for typing. but even then, that assertion is incorrect, javascript has been making up a large majority of the codebase for quite some time now. Nodejs is 12 years old and jquery 15. That argument is one that could've been made like 9 years ago, but even then, multiple projects have tried adding typing and the javascript community strongly rejected it (heck typescript was pushing for it in 2014). Anecdotally, I've met considerably more and more developers coming from C# projects who are being made to do frontend work or find work in the javascript world, who seem to be very intent on pushing for typescript in their orgs.