Import from/Export to JS

Rescript supports 2 JS import/export formats.

• Common JS: require("MyFile") and module.exports = ...
• ES6 modules: import * from MyFile and export let ...

It can be configured via bsconfig.json

{
  "package-specs": {
    "module": "commonjs",
    "in-source": true
  }
}

"module": "es6 resolves node_modules using relative paths.

Export to JavaScript

• named exporting is already there
• for default export, just let default = 123.

A JavaScript default export is really just syntax sugar for a named export implicitly called default.