js_of_ocaml vs ReScript
js_of_ocaml
ocsigen.org
ReScript
rescript-lang.orgSide by side
| Figure | js_of_ocaml | ReScript |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Linux | Yes | Yes |
| API | Yes | — |
| Plans published | 1 | 0 |
| Spec score · Code Transpilers | 8.4 (#5) | 7.2 (#24) |
| JavaScript interop | Its library provides a typed interface for bridging differences between OCaml and JavaScript values. | ReScript can import JavaScript and TypeScript code, export code to JavaScript, and generate TypeScript types with genType. |
| Purpose | js_of_ocaml compiles OCaml bytecode programs to JavaScript for use in browsers and Node.js. | ReScript is a strongly typed language that compiles to clean, efficient JavaScript. |
Plans
In their own words
js_of_ocaml
js_of_ocaml compiles OCaml bytecode programs into JavaScript for browsers and Node.js. It works with an existing OCaml installation and does not require libraries to be recompiled. Installation is available through opam, while Dune supports separate compilation in development and whole-program compilation in release builds. Whole-program compilation performs global dead-code elimination and cross-module optimization. The library provides a typed bridge between OCaml and JavaScript, including PPX syntax for properties, methods, constructors and objects. Browser bindings cover the DOM, Fetch, WebSockets, WebGL, workers and typed arrays. Optional packages add Lwt support, TyXML, JSON derivation and an OCaml toplevel in the browser. Documented targets include Node.js 18 or later, QuickJS-NG and modern ECMAScript 2020 browsers, including Chrome 80+, Firefox 74+, Safari 13.4+ and Edge 80+. Requirements include OCaml 4.13–5.5, Dune 3.20 or later and Menhir. The project is free and open source.
ReScript
ReScript has no write-up on Specifiction yet; its figures are above.