With ESM landing in browsers, attention is turning to Node’gs future ESM support. Unlike browsers, which have an out-of-band parse goal signal and no prior module format, support for ESM in Node is a bit more…prickly. Node’s legacy module format, a CommonJS (CJS) variant, is a big reason for Node’s popularity, but CJS also complicates Node’s future ESM support. As a refresher, let’s look at an example of both module syntaxes.


const a = require("./a")
module.exports = { a, b: 2 }


import a from "./a"
export default { a, b: 2 }

Source: ES Modules in Node Today! – Web Dev @ Microsoft – Medium