Browser Support & Polyfills

ReScript compiles to modern JavaScript (ES6+ by default). The generated output targets contemporary browsers and current versions of Node.js, so polyfills are generally not needed.

If you need to support very old browsers that lack ES6+ features, use your bundler's transpilation and polyfill capabilities (for example, Babel or SWC via Webpack, Vite, or esbuild) to downlevel the output as needed.