I'm going to continue with this video but I imported the outdated packages into the current one, which saw me compiling 3000 items, which I don't know what that's done to my system now:

 nixos@nixos  ~  cat /etc/nixos/configuration.nix                                                                                                                                                      04:12:21
# Edit this configuration file to define what should be installed on
# your system. Help is available in the configuration.nix(5) man page, on
# https://search.nixos.org/options and in the NixOS manual (`nixos-help`).

# NixOS-WSL specific options are documented on the NixOS-WSL repository:
# https://github.com/nix-community/NixOS-WSL

{ config, lib, pkgs, modulesPath, ... }:

with lib;
let
  nixos-wsl = import ./NixOS-WSL;
in
{
  imports = [
    # include NixOS-WSL modules
    "${modulesPath}/profiles/minimal.nix"

    nixos-wsl.nixosModules.wsl
  ];

  wsl = {
    enable = true;
    automountPath = "/mnt";
    defaultUser = "nixos";
    startMenuLaunchers = true;

    # docker.enable = true;
  };

  # flakes

  nix = {
    package = pkgs.nixFlakes;
    settings.experimental-features = [ "nix-command" "flakes" ];
  };


  environment.systemPackages = with pkgs; [
    file
    fish
    git
    neovim
    nodejs
    wget
  ];

  programs = {
    fzf = {
      keybindings = true;
      fuzzyCompletion = true;
    };
    fish.enable = true;
  };

  users.users.nixos.shell = pkgs.fish;
  users.users.root.shell = pkgs.fish;

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It's perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "23.11"; # Did you read the comment?

with lib;
let
  nixos-wsl = import ./NixOS-WSL;
in
{
  imports = [
    # include NixOS-WSL modules
    "${modulesPath}/profiles/minimal.nix"

    nixos-wsl.nixosModules.wsl
  ];

In reply to @k900:0upti.me

with lib;
let
  nixos-wsl = import ./NixOS-WSL;
in
{
  imports = [
    # include NixOS-WSL modules
    "${modulesPath}/profiles/minimal.nix"

    nixos-wsl.nixosModules.wsl
  ];

I have this configuration file now

───────┬───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
       │ File: /etc/nixos/configuration.nix
───────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
   1   │ { config, lib, pkgs, ... }:
   2   │
   3   │ {
   4   │   imports = [
   5   │
   6   │     /etc/nixos/.nix/system.nix
   7   │     /etc/nixos/.nix/environment.nix
   8   │     <nixos-wsl/modules>
   9   │   ];
  10   │
  11   │   wsl = {
  12   │     enable = true;
  13   │     defaultUser = "nixos";
  14   │     startMenuLaunchers = true;
  15   │
  16   │     # docker.enable = true;
  17   │   };
  18   │
  19   │   system.stateVersion = "23.11";
  20   │ }
───────┴───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────