Getting subclasses of a sealed trait

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You don’t need any 3rd party library to do this:

sealed trait MyTrait

case object SubClass1 extends MyTrait
case object SubClass2 extends MyTrait

import scala.reflect.runtime.{universe => ru}

val tpe = ru.typeOf[MyTrait]
val clazz = tpe.typeSymbol.asClass
// if you want to ensure the type is a sealed trait, 
// then you can use clazz.isSealed and clazz.isTrait
clazz.knownDirectSubclasses.foreach(println)

Output:

object SubClass1

object SubClass2

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