Node.js

Node.js is an open-source, cross-platform, back-end, JavaScript runtime environment that executes JavaScript code outside a web browser.

Eternaltwin uses Node.js for its website and various command-line tools.

Installation

⚠ Eternaltwin requires Node.js >=20.11.0 (see engines.node in the root package.json).

The recommended way to install Node.js is through a version manager, so you can switch versions per-project and avoid needing sudo for global installs.

Linux or Mac

Install nvm (or fnm, a faster alternative written in Rust).
Run nvm install --lts (or fnm install --lts) to install the latest Long-Term Support release.

Check your installation with node --version.

⚠ Most Linux distributions provide a nodejs or node package. This is a system-level package intended as a dependency for other software. It is recommended to avoid using this version: it requires sudo to install global packages using npm and may be an older version that does not support some projects.

Windows

Either install fnm and run fnm install --lts, or download the official Windows installer and execute it.

Check your installation with node --version.