index.re

type timerID;
[@bs.val] external setInterval: (unit => unit, int) => timerID = "setInterval";
[@bs.val] external clearInterval: timerID => unit = "clearInterval";

module Counter = {
    let component = ReasonReact.component("Counter");
    let make = (~initial = 0, _children) => {
        ...component,
        render: _self => {
            let (count, setCount) = ReactHooks.useState(initial);
            ReactHooks.useEffectWithoutDependencies(() => {
                setInterval(() => setCount(. count + 1), 1000) |> ignore;
                None
            });

            <box width="50%" height="50%">
                {ReasonReact.string({j|Count: $count|j})}
            </box>
        },
    }
}

let screen = Blessed.screen(~smartCSR = true, ())
ReactBlessed.render(<Counter />, screen)