Rescript
ReScript is a strongly typed programming language that compiles to clean, efficient JavaScript. It is designed to be readable by both humans and AI tools, providing a fast compiler and static type system for building JavaScript, Node, and React applications.
Key facts
What is Rescript?
A robustly typed language that compiles to readable JavaScript without the fear of 'any' types, enabling fast feedback loops for both human and AI-assisted development.
Who is Rescript best for?
Developers building JavaScript, Node, and React applications who want type safety and fast compilation.
Key features
- ✓Fastest build system on the web with consistent and fast feedback loops for any codebase size
- ✓Robust type system with no `any`, no magic types, and no surprise `undefined`
- ✓Seamless integration with the JavaScript ecosystem – use any JS library, export to JS, and auto-generate TypeScript types
- ✓Built-in pretty printer and memory-friendly VSCode & Vim plugins
- ✓Stable compiler requiring minimal configuration
- ✓Gradual adoption – can be introduced incrementally and removed without lock-in
Use cases
- →Building reliable React applications with first-class bindings
- →Developing Node.js applications targeting the Node platform
- →Gradually introducing type safety into existing JavaScript codebases
- →Integrating with existing TypeScript codebases using automatic type generation
- →Creating clean JavaScript output that is easy for AI tools to read and understand
Pros
- +Fast compilation and feedback loop even for large codebases
- +Simple, clear types that are easy to debug
- +No lock-in – can revert to plain JavaScript at any time
Positioning
- Core value: A robustly typed language that compiles to readable JavaScript without the fear of 'any' types, enabling fast feedback loops for both human and AI-assisted development.
- Ideal for: Developers building JavaScript, Node, and React applications who want type safety and fast compilation.
- Product type: npm package and compiler
Frequently asked questions
What is ReScript?
ReScript is a strongly typed language that compiles to clean, efficient JavaScript. It is designed for both humans and AI tools to read and understand.
How do I install ReScript?
You can install ReScript via npm or yarn: `npm install rescript`. Or generate a new project with `npx create-rescript-app`.
Can I use ReScript with React?
Yes, ReScript provides first-class bindings for ReactJS that are used by production users worldwide.
How do I integrate ReScript with existing JavaScript or TypeScript projects?
ReScript supports gradual adoption. You can start by adding ReScript files alongside your existing code. It also automatically generates TypeScript types for seamless integration.
Is ReScript open source?
ReScript is a project with a community and is available on GitHub. The website does not explicitly state 'open source', but the source code is publicly accessible via the GitHub link.
What tools are available for ReScript development?
ReScript includes a built-in pretty printer, memory-friendly plugins for VSCode and Vim, and a stable compiler that requires little configuration.
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