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Top 18 Scala Typelevel Projects
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I built the N×M expansion with a KSP processor that generated a trait accessor per position-trait combo, and it compiled. But the abstraction leaked: every call site had to import the right extensions for the traits it read, the parameterized-instances pattern still had no clean read, and the whole thing felt like a hack. Languages with higher-kinded or dependent types make this natural (shapeless is the closest analogue on the JVM), but that's not exactly mainstream territory. Without those features you're encoding a record with positional bookkeeping. I cut it.
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Scala's refined uses compile-time macros to verify literal values at compilation. java-refined operates at runtime because Java lacks macro support. The tradeoff: Scala refined catches errors at compile time for literals, while java-refined catches errors at construction time for all values (including dynamic input). Both encode the constraint in the type system.
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skunk-crypt takes a smaller, sharper angle: encryption is just another Skunk codec. You keep writing ordinary Skunk queries; you just swap text for crypt.text. Plain values in your application, AES-256-GCM ciphertext in the database, and the key never leaves your process.
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gql
A functional GraphQL implementation for Scala. https://valdemargr.github.io/gql/ (by ValdemarGr)
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skunk-crypt takes a smaller, sharper angle: encryption is just another Skunk codec. You keep writing ordinary Skunk queries; you just swap text for crypt.text. Plain values in your application, AES-256-GCM ciphertext in the database, and the key never leaves your process.
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Scala Typelevel discussion
Scala Typelevel related posts
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Mouse 0.4.2 - Early release
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Question regarding Recursive datatypes and cats typeclasses (Haskell to Scala)
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Type erased on implicit evidence check
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Cross-Training to Ada - which are the best languages to begin from?
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for comprehension and some questions
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Is there the equivalent of this in Scala ? (Maps to Struct)
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Grasping the concepts and getting them down to earth
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Index
What are some of the best open-source Typelevel projects in Scala? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Shapeless | 3,405 |
| 2 | Http4s | 2,617 |
| 3 | doobie | 2,223 |
| 4 | Monix | 1,934 |
| 5 | refined | 1,731 |
| 6 | Monocle | 1,697 |
| 7 | skunk | 1,658 |
| 8 | scala-pet-store | 1,078 |
| 9 | frameless | 898 |
| 10 | scodec | 817 |
| 11 | mouse | 376 |
| 12 | coulomb | 152 |
| 13 | spotted-leopards | 117 |
| 14 | lila-fishnet | 48 |
| 15 | scalanews | 37 |
| 16 | batcher | 19 |
| 17 | gql | 16 |
| 18 | skunk-crypt | 2 |
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