Foo.scala

import cats.syntax.all._
import cats.effect._
import scala.concurrent.duration._
import scala.language.higherKinds

object Foo {
  def setInterval[F[_]](duration: FiniteDuration)(
    fa: F[Unit]
  )(implicit F: ConcurrentEffect[F], T: Timer[F]): F[IO[Unit]] = {
    def run: F[Unit] = {
      T.sleep(duration) *>
        F.liftIO(F.runAsync(F.suspend(run))(_ => IO.unit)) *> fa
    }
    F.liftIO(F.runCancelable(run)(_ => IO.unit))
  }
}