Enabling nix flakes

Enabling flakes in NixOS
Add the following code into your configuration.nix:
{ pkgs, ... }: { nix = { package = pkgs.nixFlakes; extraOptions = '' experimental-features = nix-command flakes ''; };}
Enabling flakes in Linux and Windows Subsystem Linux 2 (WSL2)
Make sure nix is installed. Next, install nixUnstable by running the following code:
nix-env -iA nixpkgs.nixFlakes
Then, open your ~/.config/nix/nix.conf or /etc/nix/nix.conf file, depending on whether nix is installed globally or locally, and add:
experimental-features = nix-command flakes

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