Export OCaml to JavaScript

dune

(executable
 (name hello)
 (libraries js_of_ocaml)
 (modes js)
 (preprocess
  (pps js_of_ocaml-ppx)))

example_usage.txt

$ node test.js 
11.5
3.5

hello.ml

open Js_of_ocaml

let add1 x = x +. 1.0

let () = Js.export "add1" add1

let () =
  Js.export "lib"
    (object%js
       method add x y = x +. y
    end)

test.js

// Assuming you run this from the dune-project root.
const hello = require("./_build/default/hello.bc");

console.log(hello.add1(10.5));

console.log(hello.lib.add(1, 2.5));