---
title: ReasonReact using ReactJS
---

`MyBanner.js:`

```javascript
var ReactDOM = require('react-dom');
var React = require('react');
var App = React.createClass({
  displayName: "MyBanner",
  render: function() {
    if (this.props.show) {
      return React.createElement('div', null,
        this.props.message
      );
    } else {
      return null;
    }
  }
});
module.exports = App;
```

`MyBannerRe.re`

```reason
/* ReactJS used by ReasonReact */
/* This component wraps a ReactJS one, so that ReasonReact components can consume it */
/* Typing the myBanner.js component's output as a `reactClass`. */
[@bs.module] external myBanner : ReasonReact.reactClass = "./MyBanner";

[@bs.deriving abstract]
type jsProps = {
  show: bool,
  message: string,
};

/* This is like declaring a normal ReasonReact component's `make` function, except the body is a the interop hook wrapJsForReason */
let make = (~show, ~message, children) =>
  ReasonReact.wrapJsForReason(
    ~reactClass=myBanner,
    ~props=jsProps(~show, ~message),
    children,
  );
```