IntelliJ / WebStorm has this exact feature.

You can also generate API types based on your backend.

That is cool. Will try that. But the type information the IDE provides to me is sufficient even without TypeScript. So, back again to the question — is TypeScript worth it?

I had the same question initially. TypeScript is the way you configure intellisense. Some types can be inferred, but not all, and most of the typing I do is to _restrict_ what data can be used. TS gives you feedback anywhere you ask for it, and paired with IntelliJ I feel like I have superpowers.

Another point: You can create types for your API client programatically, meaning your front-end can be aware of exactly what types your backend is returning. This cannot be accomplished with intellisense.