feat. Add mapK on UUIDGenerator

build.sbt

@@ -1,6 +1,6 @@
 import com.typesafe.tools.mima.core._
 
-ThisBuild / tlBaseVersion := "0.4" // your current series x.y
+ThisBuild / tlBaseVersion := "0.5" // your current series x.y
 
 ThisBuild / organization := "tech.ant8e"
 ThisBuild / organizationName := "Antoine Comte"
@@ -35,11 +35,6 @@ lazy val core = crossProject(JVMPlatform, JSPlatform)
       "org.scalameta" %%% "munit" % "0.7.29" % Test,
       "org.typelevel" %%% "munit-cats-effect-3" % "1.0.7" % Test,
       "org.scalameta" %%% "munit-scalacheck" % "0.7.29" % Test
-    ),
-    mimaBinaryIssueFilters ++= Seq(
-      ProblemFilters.exclude[ReversedMissingMethodProblem](
-        "tech.ant8e.uuid4cats.TimestampedUUIDGeneratorBuilder.tech$ant8e$uuid4cats$TimestampedUUIDGeneratorBuilder$$GeneratorState"
-      )
     )
   )
 

core/shared/src/main/scala/tech/ant8e/uuid4cats/UUID4cats.scala

@@ -19,12 +19,18 @@ package tech.ant8e.uuid4cats
 import cats.effect.std.{Mutex, Random, SecureRandom}
 import cats.effect.{Async, Clock, Ref}
 import cats.syntax.all.*
+import cats.~>
 import tech.ant8e.uuid4cats.TimestampedUUIDGeneratorBuilder.GeneratorState
 
 import java.util.UUID
 
 trait UUIDGenerator[F[_]] {
   def uuid: F[UUID]
+  def mapK[G[_]](fk: F ~> G): UUIDGenerator[G] = {
+    new UUIDGenerator[G] {
+      override def uuid: G[UUID] = fk(UUIDGenerator.this.uuid)
+    }
+  }
 }
 
 object UUIDGenerator {

core/shared/src/test/scala/tech/ant8e/uuid4cats/BuilderSuite.scala

@@ -16,6 +16,8 @@
 
 package tech.ant8e.uuid4cats
 
+import cats.syntax.all.*
+import cats.~>
 import munit.FunSuite
 
 import java.util.UUID
@@ -50,6 +52,20 @@ class BuilderSuite extends FunSuite {
     assertEquals(obtained, expected)
   }
 
+  test("UUIDGenerator accepts natural transformations") {
+    val generator: UUIDGenerator[List] = new UUIDGenerator[List] {
+      def uuid: List[UUID] = List(
+        uuid"017F22E2-79B0-7CC3-98C4-DC0C0C07398F",
+        uuid"017F22E2-79B0-7CC3-98C4-DC0C0C07398F"
+      )
+    }
+    val listToOption = new (List ~> Option) {
+      override def apply[A](fa: List[A]): Option[A] = fa.headOption
+    }
+    val obtained = generator.mapK(listToOption).uuid
+    assertEquals(obtained, uuid"017F22E2-79B0-7CC3-98C4-DC0C0C07398F".some)
+  }
+
   implicit class uuidOps(sc: StringContext) {
     def uuid(args: Any*): UUID = UUID.fromString(sc.s(args: _*))
   }