Enumize

Instructs the sealed-class-enumizer compiler plugin to generate enum-like operations for the annotated sealed class or sealed interface.

@Enumize
sealed interface SI {
    data class Foo(val v: Int) : SI
    data object Bar : SI
}

generates a nested sealed interface SI.Enumish implementing Enumish, whose values ("kinds") are singletons representing the leaves of the hierarchy:

SI.Enumish.entries          // [Bar, Foo] — all kinds (see [EnumishCompanion.entries])
SI.Enumish.valueOf("Foo")   // label-based lookup (see [EnumishCompanion.valueOf])
val si: SI = SI.Foo(42)
si.asEnumish()              // the kind of a value (see [Enumized.asEnumish])
si.label                    // "Foo" — the `label` extension, enum's `name` counterpart

Everything is generated at compile time; no runtime reflection is involved and all Kotlin Multiplatform targets are supported.

labelCase chooses the case conversion applied to leaf simple names when deriving labels. The default LabelCase.PROJECT_DEFAULT reads the project-wide default configured in the Gradle DSL (falling back to no conversion), and omitting the argument means the same. Individual leaves can override their label with EnumishLabel.

The retention is AnnotationRetention.BINARY: the annotation is never read at runtime — the explicit statement that nothing here depends on runtime reflection — while staying visible in metadata to build tooling.