ReasonML Quick Start Guide

Understanding the [@bs.module] decorator

To import a node module, use [@bs.module]. The compiled output depends on the package-specs configuration used within bsconfig.json. We're using es6 as the module format.

[@bs.module] external leftPad: (string, int) => string = "left-pad";let result = leftPad("foo", 6);

This compiles to the following:

import * as LeftPad from "left-pad";var result = LeftPad("foo", 6);export {  result ,}

Setting the module format to commonjs results in the following compiled output:

var LeftPad = require("left-pad");var result = LeftPad("foo", 6);exports.result = result;

When there is no string argument to [@bs.module], the default value is imported.