Freya is in development, you can learn more in the book.

fn app(cx: Scope) -> Element {
  let mut count = use_state(cx, || 0);

  rsx!(
      rect {
          height: "20%",
          width: "100%",
          background: "rgb(233, 196, 106)",
          padding: "25",
          color: "rgb(20, 33, 61)",
          label { 
              font_size: "20", 
              "Number is: {count}"
          }
      }
      rect {
          height: "80%",
          width: "100%",
          background: "rgb(73, 151, 222)",
          color: "black",
          padding: "25",
          onclick: move |_| count += 1,
          label { "Click to increase!" }
      }
  )
}
Number is: 37
Click to increase