Typescript has been a win because, in general, it makes codebase maintenance less brittle. It's significantly easier to refactor in TS than JS, which encourages incremental improvements, file re-organizing, etc. Our developers are happier with the overall development experience.

The downside is that TS sometimes exacerbates problems caused by Node's fragmented ecosystem. Sometimes @types/ don't work, other times types are outdated. This can lead to problems with newly-installed libraries.

If your project is big enough, I'd say TS is nearly always worth it, but it can make selecting libraries a pain. TypeScript