option-t

A toolkit of Nullable/Option/Result type implementation in ECMAScript. Their APIs are inspired by Rust's `Option<T>` and `Result<T, E>`.

monads-io

🚀 Efficient Monads for JS: Maybe (Option) and Either (Result), Identity

@fastify/funky

Support for fastify routes returning functional structures, such as fp-ts Either, Task, TaskEither or plain javascript parameterless functions