HandleRoutingState.re

initialState: () => {route: Home},
  /* Inside the make function of a React component */
  didMount: self => {
    let watchId =
    /* Re.React gives us Router API */
      ReasonReact.Router.watchUrl(url =>
        self.send(
          /* url.search, url.hash is also available */
          switch (url.path) {
          | [""]
          | []
          /* We render whole pages based on our route constructors! */
          | ["/"] => Home
          | ["page1"] => Page1
          | ["page2"] => Page2
          | ["page3"] => Page3
          | ["nested", "page4"] => Page4
          | ["auth", wildCard] => WildCardPage(wildCard)
          | _ => NotFound
          },
        )
      );
    self.onUnmount(() => ReasonReact.Router.unwatchUrl(watchId));
  },