Cats Effect

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To use Tyrian with Cats Effect, we need to bring in the tyrian-io library.

ivy"io.indigoengine::tyrian-io::x.y.z" // Mill
libraryDependencies += "io.indigoengine" %%% "tyrian-io" % "x.y.z" // SBT

Then we can bring in the TyrianIOApp trait to create our application.

@JSExportTopLevel("TyrianApp")
object Counter extends TyrianIOApp[Msg, Model]:

Cmds and Subs then make use of the IO type to perform side effects.

def update(model: Model): Msg => (Model, Cmd[IO, Msg]) =
  case Msg.Increment => (model + 1, Cmd.None)
  case Msg.Decrement => (model - 1, Cmd.None)
  case Msg.NoOp      => (model, Cmd.None)

def subscriptions(model: Model): Sub[IO, Msg] =
  Sub.None