Installation

The installation process is rather simple, but it can differ a bit depending on your Operating System.

NodeJS

Frontio is available as a Node Package, and thus requires NodeJS to install and run it from the command line. Head over to the NodeJS website and grab the installer for your OS. The recommended version is, well... recommended as this one contains the most stable release.
Frontio requires at least NodeJS 16.

You can check if the installation was successful by typing the commands node -v and npm -v in your command line. If the respective versions of NodeJS and NPM are printed out, then you're good to go to the next step!

Note: Make sure you restart your command line if it was open during installation. Otherwise the above commands may not be immediately available.

Sass

Support for Sass is built into Frontio, and no longer needs a separate installation. Yay!
If you want to get the most out of this preprocessor, you can find all the documentation on the official Sass website.

Frontio

Now that we have the requirements out of the way, it is time for the most critical step: the installation of Frontio itself. This is as simple as installing any node package:

npm install -g frontio

Again, you can make sure that the installation was successful by checking the package version with frontio -v or io -v.

Note: during the installation process, you may notice a lot of "Deprecated" notices. This is normal and does not imply an error. It simply means that some of the packages that Frontio is based on need to be updated. This is up to the package owners to fix.

Possible errors during installation

Permission denied or Error: EACCESS
Any time you encounter this error, type the same command again, but add sudo at the beginning. After pressing enter, you will be asked to type in your password. In this way, you tell the command line that you have administrator rights.
Sudo doesn't work
This fix has only been tested with Frontio's installation so far. But it will probably work with other packages as well. Type the following command:

sudo npm install -g frontio --unsafe-perm=true --allow-root

This makes sure you are installing Frontio as the root user.

Updates

Updating Frontio to the latest version is as simple as using this command:

npm update -g frontio

If any permission errors pop up, start with sudo.