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ReScript

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Description #

ReScript is a fast, typed functional language that compiles to high-performance JavaScript with a smooth developer experience.

History #

ReScript evolved from ReasonML and BuckleScript. It was renamed and repositioned as a standalone language in 2020 with its own syntax and tooling, while still rooted in OCaml.

Hello World Code #

Js.log("Hello, World!")

How to Run #

Option 1: Online
ReScript Playground

Option 2: Local

  • Install: 
npm install -g rescript
rescript init my-project

Compile and run:

npm run res:build

Key Concepts #

  • Statically typed with type inference
  • Functional-first but JavaScript-friendly
  • Immutable by default
  • Pattern matching
  • Pipe operators
  • React integration via ReScriptReact
  • Fast compile times
  • Clean JS output
  • No null/undefined pitfalls
  • Strong tooling and editor support

Try It Online #

https://rescript-lang.org/try

Fun Facts #

  • ReScript aims to be “the type-safe TypeScript alternative” for modern JS developers.
  • Though based on OCaml, ReScript has a distinct syntax optimized for JavaScript interop.
  • It’s used in Meta (Facebook) and Vercel projects.

Resources #

Official Site
Docs
GitHub
Community

Updated on June 10, 2025

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