JavaScript Made Simple for Humans and AI
Types > Vibes
ReScript is a strongly typed language that compiles to clean, efficient JavaScript that humans and AI tools can read and understand.
Its fast compiler and static type system keep feedback loops tight, so you can move quickly with AI assistance while maintaining confidence as your codebase grows.
Readable in. Predictable out.
Readable source, predictable output, and fast compiler feedback make ReScript easier to work with. That matters while learning, debugging, reviewing changes, and iterating with coding agents.
module Button = {
@react.component
let make = (~count) => {
let times = switch count {
| 1 => "once"
| 2 => "twice"
| n => n->Int.toString ++ " times"
}
let text = `Click me ${times}`
<button> {text->React.string} </button>
}
}import * as JsxRuntime from "react/jsx-runtime";
function Playground$Button(props) {
let count = props.count;
let times = count !== 1 ? (
count !== 2 ? count.toString() + " times" : "twice"
) : "once";
let text = "Click me " + times;
return JsxRuntime.jsx("button", {
children: text
});
}
let Button = {
make: Playground$Button
};
export {
Button,
}

Leverage the full power of JavaScript in a robustly typed language without the fear of `any` types.
ReScript is used to ship and maintain mission-critical products with good UI and UX.
Quick Install
The fastest build system on the web
ReScript cares about a consistent and fast feedback loop for any codebase size. Refactor code, pull complex changes, or switch to feature branches as you please. No sluggish CI builds, stale caches, wrong type hints, or memory hungry language servers that slow you down.
Type Better
The familiar JS ecosystem at your fingertips
Why ReScript works well with coding agents
Coding agents tend to work best when the surrounding system is readable, predictable, and easy to review. ReScript helps by keeping the source language simple, the compiler feedback fast, and the generated output understandable.
Readable code helps agents stay on track
ReScript's syntax is small, consistent, and easy to scan, which makes generated edits easier to inspect and prompts easier to ground in real code.
Compiler errors create a tighter repair loop
Instead of vague runtime failures, agents get concrete feedback about what is wrong and where the contract broke. That makes iterative repair much more reliable.
Humans can still review the result
ReScript compiles to straightforward JavaScript, so teams can inspect output, debug behavior, and keep handoff between human and agent work understandable.

A community of programmers who value getting things done
No language can be popular without a solid community. A great type system isn't useful if library authors abuse it. Performance doesn't show if all the libraries are slow. Join the ReScript community — A group of companies and individuals who deeply care about simplicity, speed and practicality.

Tooling that just works out of the box
A builtin pretty printer, memory friendly VSCode & Vim plugins, a stable type system and compiler that doesn't require lots of extra configuration. ReScript brings all the tools you need to build reliable JavaScript, Node and ReactJS applications.

Easy to adopt — without any lock-in
ReScript was made with gradual adoption in mind. If you ever want to go back to plain JavaScript, just remove all source files and keep its clean JavaScript output. Tell your coworkers that your project will keep functioning with or without ReScript!
Trusted by our users
Curated resources

Language Manual

ReScript + React

Gradually Adopt ReScript

