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Cats
A library intended to provide abstractions for functional programming in Scala, leveraging its unique features. Design goals are approachability, modularity, documentation and efficiency.
js / jvm / native
| https://github.com/typelevel/cats |
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Cats-Effect
The IO Monad for Scala, plus type classes for general effect types.
js / jvm / native
| https://github.com/typelevel/cats-effect/ |
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fs2
FS2 is a library for purely functional, effectful, and polymorphic stream processing library in the Scala programming language. Its design goals are compositionality, expressiveness, resource safety, and speed. The name is a modified acronym for Functional Streams for Scala (FSS, or FS2).
js / jvm / native
| https://github.com/typelevel/fs2 |
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http4s
A typeful, purely functional HTTP library for client and server applications
js / jvm / native
| https://github.com/http4s/http4s |
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Custom Error Types Using Cats Effect and MTL
by Daniel Spiewak
on Sep 02, 2025
technical
| https://typelevel.org/typelevel.github.com/blog/2025/09/02/custom-error-types.html |
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Evolving Typelevel
by Typelevel
on Aug 19, 2025
governance
| https://typelevel.org/typelevel.github.com/blog/2025/08/19/evolving-typelevel.html |
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Typelevel Weaver released
by Zainab Ali
on Jun 10, 2025
technical
| https://typelevel.org/typelevel.github.com/blog/2025/06/10/weaver-test-release.html |
| See all posts | https://typelevel.org/typelevel.github.com/blog/ |
| https://typelevel.org/ |
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