fp-ts

The fp-ts library brings functional programming concepts to TypeScript. It helped us model errors explicitly, compose asynchronous flows, and write more declarative business logic.

Why we put fp-ts on hold

After evaluating it thoroughly in real projects, we are now putting fp-ts on hold. While the library gave us real benefits, we also found important drawbacks that now outweigh those advantages for our context.

The main showstopper is that fp-ts is no longer actively maintained. This creates a concrete risk that it may not keep working with future major TypeScript versions.

On top of that, fp-ts has a steep learning curve and relies on jargon and abstractions that are not familiar to many developers. This makes onboarding harder, slows down day-to-day development, and negatively impacts both productivity and developer experience.