lloydmeta/enumeratum

Health v2 · maintenance only

Adoption not part of the score

1222 stars · 151 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Enumeratum is a type-safe, reflection-free enumeration library for Scala with exhaustive pattern match warnings and compile-time macro-based value collection. It supports ValueEnums with compile-time uniqueness constraints and integrates with popular Scala libraries like Play JSON, Circe, and Doobie.

Use cases

• define type-safe enums in Scala without runtime reflection
• get exhaustive pattern match warnings for enum values
• create value enums mapping to Int, Long, or String with compile-time uniqueness checks
• serialize and deserialize enums with Play JSON, Circe, or other Scala JSON libraries
• use enums in Scala.js or Scala Native projects where reflection is unavailable
• store enums in a database via Doobie or Slick integrations

When to choose

• you need type-safe enumerations in Scala with IDE-friendly idiomatic code
• your target platform lacks reliable reflection support (Scala.js, Scala Native, Android)
• you want compile-time validation of enum value uniqueness
• you need zero-dependency, performant enums faster than Scala's built-in Enumeration

When to avoid

• you are not working in Scala
• you need Java-style enums with built-in JVM semantics
• your project uses Scala 3 and you cannot enable the -Yretain-trees compiler option for ValueEnums

Facets

library · maturity stable

serialization developer-tools programming-languages developer-tools jvm cross-platform scala enumerations value-enum type-safe macro scala-js scala-native

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