[MBlume]

I'm a little confused about when I'd use this, if I'm quickly iterating on code as I develop it, probably I also want to know whether it type checks, right?

[umvi]

TS language server will do that for you as go along

[NBJack]

Wouldn't that defeat the point of what static typing affords you? Before you "go along"?

[shepherdjerred]

No, during development your IDE will show you type errors and your dev server can ignore them. In CI tsc can type check. It's the best of all worlds: incorrect code will compile and work best-effort, you can see errors in your IDE, and CI will fail if it's incorrect.

[chpatrick]

You can have the code running in your browser instantly and have the typechecking happening in parallel while you develop.