oyvindberg

class WrapBackendScope[P, S](b: BackendScope[P, S]){
  def props = CallbackTo[P](b.props)
  def state = CallbackTo[S](b.state)
  def both  = CallbackTo[(P, S)]((b.props, b.state))

  def modState(f: S => S, cb: Callback = Callback.empty): Callback =
    state >>= (s => b.setState(f(s), cb))

  def modStateCB(f: S => CallbackTo[S], cb: Callback = Callback.empty): Callback =
    state >>= (s => b.setStateCB(f(s), cb))

oyvindberg

import japgolly.scalajs.react.BackendScope
import japgolly.scalajs.react.extra._
import scalaz.syntax.id._

final case class CachingBackendScope[P: Reusability, S: Reusability]
                                    (b: BackendScope[P, S]){ outer ⇒

  type PropVal[O]  = ReactVal[P,      O]
  type StateVal[O] = ReactVal[(P, S), O]