For building web applications or a system that includes logic that needs to run on the web? TypeScript is mature enough, and it's top tier for domain modeling. As long as you stay disciplined, Claude Code will write excellent TypeScript for you, and you can run it pretty much anywhere.

The only reasons to hesitate, imo, are (A) you're worried that it won't perform as well as you need on your servers, or (B) you're scared of npm supply chain attacks.

The main risk-of-regret is: How will you feel when/if the $20/month plan costs $2000/month?

May never happen. But be clear with yourself if you’re relying on it not happening.

It’s a hell of a nice risk mitigator to understand the code, in a language you know, if you have to print-debug it yourself at some point.