Installation

Requirements:

• rescript@10.1 or later

• react@18.0.0 or later

Add following dependency to your ReScript project (in case you don't have any project yet, check out the installation instructions in the manual):

npm install @rescript/react

Then add the following setting to your existing bsconfig.json:

JSON
{
  "jsx": { "version": 4, "mode": "classic" },
  "bs-dependencies": ["@rescript/react"]
}

The new jsx transform of ReactJS is available with mode: "automatic".

Note JSX v4 is newly introduced with the idiomatic record-based representation of a component. If your dependencies are not compatible with v4 yet, then you can use v3 in the same project. Check out the details in Migrate from v3

To test your setup, create a new .res file in your source directory and add the following code:

RES
// src/Test.res
@react.component
let make = () => {
  <div> {React.string("Hello World")} </div>
}

Now run npx rescript and you should see a successful build.

Exposed Modules

After a successful installation, @rescript/react will make the following modules available in your project's global scope:

• React: Bindings to React

• ReactDOM: Bindings to the ReactDOM

• ReactDOMServer: Bindings to the ReactDOMServer

• ReactEvent: Bindings to React's synthetic events

• ReactDOMStyle: Bindings to the inline style API

• RescriptReactRouter: A simple, yet fully featured router with minimal memory allocations

• RescriptReactErrorBoundary: A component which handles errors thrown in its child components gracefully