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This guide walks you through layering a default environment with a project’s environment.

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Create your default $HOME environment

First, create your default environment by following default environment tutorial.

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Install packages

Now let’s flox install tools that will be useful on any system regardless of the project. Here we are installing curl, gitFull, gnupg, inetutils, tree, and vim. 
$ flox install curl gitFull gnupg inetutils tree vim
✔ 'curl' installed to environment default at /Users/youruser
✔ 'gitFull' installed to environment default at /Users/youruser
✔ 'gnupg' installed to environment default at /Users/youruser
✔ 'inetutils' installed to environment default at /Users/youruser
✔ 'tree' installed to environment default at /Users/youruser
✔ 'vim' installed to environment default at /Users/youruser
Let’s inspect the contents of the environment with flox list: 
$ flox list
curl: curl (8.4.0)
gitFull: gitFull (2.42.0)
gnupg: gnupg (2.4.1)
inetutils: inetutils (2.5)
tree: tree (2.1.1)
vim: vim (9.0.2116)
We can test the environment is working properly with flox activate. 
$ flox activate
flox [default] $ which git
/Users/youruser/.flox/run/aarch64-darwin.default/bin/git
flox [default] $ git --version
git version 2.42.0
Everything is working!

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Layering a project environment

Now that we have our tools in the default environment we can layer on a new environment that brings in project-specific dependencies. For this example we will use a publicly accessible Node project called material-ui. Let’s clone the example project to our home directory and enter the project’s directory: 
flox [default] $ git clone https://github.com/mui/material-ui.git
Cloning into ...
flox [default] $ cd material-ui
Use flox init from the material-ui directory that we are in. 
flox [default] $ flox init
⚡︎ Created environment material-ui (aarch64-darwin)

Next:
  $ flox search <package>    <- Search for a package
  $ flox install <package>   <- Install a package into an environment
  $ flox activate            <- Enter the environment
This project only requires yarn so let’s install it with flox install. 
flox [default] $ flox install yarn
✔ 'yarn' installed to environment material-ui at /Users/youruser/material-ui
Now we’re ready to do development on this project! Let’s activate the material-ui Flox environment and start material-ui’s development server. 
flox [default] $ flox activate
flox [material-ui default] $ yarn start
...
We now have access to both the dependency this project needs (yarn) and the tools we need to do development on any project (vim, git, etc)! You can layer as many environments as you want. If two environments contain the same package, Flox will use the package from the last environment activated. You can use flox envs to see the environments you have activated. 
$ flox envs
⚡︎ Active environments:
  material-ui  /home/youruser/material-ui
  default      /home/youruser

Inactive environments:

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