Watch reason files and build for browser.

Hello.re

let bar a b => a + b;

let b = bar 1 2;

let baz a b => bar a b;

let b2 = baz 1 2;

Js.log (b, b2);

Makefile

# brew install watchman (or whatever fin eq for your OS)

Main = Hello

watch:
	watchman-make -p '**/*.re' '**/*.rei' -t reason_build
reason_build:
	bsc -pp ./node_modules/reason/refmt_impl.native -impl $(Main).re && java -jar closure-compiler-v20160822.jar --js $(Main).js --js_output_file $(Main)-compiled.js --process_common_js_modules

package.json

{
  "devDependencies": {
    "reason": "git+https://github.com/facebook/reason.git"
  },
  "dependencies": {
    "bs-platform": "^1.0.1"
  },
  "scripts": {
    "build": "Make build",
    "pretty": "./node_modules/reason/refmt_impl.native -is-interface-pp false -parse re -print ml hello.re"
  },
  "name": "test"
}