Module BasicsLesson 15Free preview

Node ES Modules

This lesson is part of Node.js · All levels

Summary

In addition to CommonJS, Node.js also supports ES Modules which are the modern standard for JavaScript. The ESM module is declared with import and export, and is active when the extended file .mjs or package.json sets type: module. ESM is evaluated statically so it's more friendly to modern tree-shaking and tooling.

Key points

Activate the ESM with the .mjs extension or set type: module in package.json
Use import to load and export to export
ESM supports dynamics that return Promise
The .cjs extension is used if you want to keep using CommonJS in an ESM project

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