Implement Invariant, tidy imports

armanbilge · Jan 29, 2023 · a6ac0b8 · a6ac0b8
1 parent d0a9c7b
commit a6ac0b8
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diff --git a/dom/src/main/scala/fs2/dom/History.scala b/dom/src/main/scala/fs2/dom/History.scala
@@ -16,7 +16,6 @@
 
 package fs2.dom
 
-import cats.data.OptionT
 import cats.effect.kernel.Async
 import cats.effect.kernel.Ref
 import cats.effect.std.Queue

diff --git a/dom/src/main/scala/fs2/dom/Serializer.scala b/dom/src/main/scala/fs2/dom/Serializer.scala
@@ -17,7 +17,6 @@
 package fs2.dom
 
 import cats.Invariant
-import cats.effect.kernel.Sync
 import cats.syntax.all._
 import scodec.bits.ByteVector
 
@@ -42,6 +41,11 @@ sealed abstract class Serializer[A] { outer =>
 
 object Serializer {
 
+  implicit lazy val invariant: Invariant[Serializer] = new Invariant[Serializer] {
+    def imap[A, B](fa: Serializer[A])(f: A => B)(g: B => A): Serializer[B] =
+      fa.imap(f)(g)
+  }
+
   private final case object Identity extends Serializer[js.Any]
   private final case object Number extends Serializer[Double]
   private final case object String extends Serializer[java.lang.String]