Initial open source release

.gitignore

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+/.merlin
+/.bsb.lock
+/lib/
+/node_modules/
+/public/bundle/
+/public/sw.js*
+/public/workbox-*.js*

README.md

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+# lumi-rescript-dev
+
+This is a utility to build and bundle rescript projects using esbuild.
+
+- Very fast builds
+- Watcher with live-reload
+- Service workers
+- Sass support
+
+## How to use
+
+Simply run `lumi-rescript-dev build` in your project root. Typically, you'll want to add the following to your `package.json`.
+
+```json
+{
+  "scripts": {
+    "prepare": "lumi-rescript-dev build",
+    "start": "lumi-rescript-dev watch",
+    "start-prod": "lumi-rescript-dev watch '{\"http\":{\"proxy\":{\"target\":\"https://your-prod.com/\"}}}'",
+    "clean": "rescript clean && rm -rf public/bundle"
+  },
+}
+```
+
+## Project structure
+
+The default config expects something like the following project structure:
+```
+project-name
+├── bsconfig.json
+├── package.json
+├── public
+│  ├── images
+│  │  ├── favicon.ico
+│  │  ├── icons-512.png
+│  │  └── some-image.png
+│  ├── index.html
+│  └── site.webmanifest
+└── src
+   ├── css
+   │  ├── default.scss
+   │  └── main.sass
+   ├── Index.res
+   └── Util.res
+
+```
+
+Generated files will end up in `lib` and `public/bundle`, by default.
+
+## Configuration
+The default configuration can be inspected using `lumi-rescript-dev dump-config`, and changes can be made by adding them to the `lumi-rescript-dev` key in your `package.json`.
+
+## JS API
+Alternatively, if you require more configuration flexibility, the code can be imported from your own code.
+```js
+const {main, defaultConfig} = require('lumi-rescript-dev')
+
+main(defaultConfig, {
+  root: __dirname
+  // ...
+})
+```

Watchman.js

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+const watchman = require('fb-watchman')
+
+class Watchman {
+    constructor() {
+        this.client = new watchman.Client()
+    }
+    command(...args) {
+        return new Promise((resolve, reject) => {
+            this.client.command(args, (err, resp) => {
+                if (err) reject(err)
+                else resolve(resp)
+            })
+        })
+    }
+    async setup_watches(dirname) {
+        const { warning, watch, relative_path } = await this.command("watch-project", dirname)
+        if (warning) {
+            console.warn('[watchman]', warning);
+        }
+        console.log('[watchman] watch established on:', watch, 'relative_path:', relative_path);
+        Object.assign(this, { watch, relative_path })
+        this.clock = await this.command("clock", watch)
+    }
+    async subscribe(name, expression) {
+        const sub = {
+            expression,
+            fields: ["name", "size", "mtime_ms", "exists", "type"],
+            since: this.clock
+        }
+        if (this.relative_path) sub.relative_root = this.relative_path
+        await this.command('subscribe', this.watch, name, sub)
+    }
+    on(x, y) {
+        return this.client.on(x, y)
+    }
+}
+module.exports.Watchman = Watchman