neovim-flake/docs/manual/installation/standalone/nixos.md

Standalone Installation on NixOS

Your built Neovim configuration can be exposed as a flake output to make it easier to share across machines, repositories and so on. Or it can be added to your system packages to make it available across your system.

The following is an example installation of nvf as a standalone package with the default theme enabled. You may use other options inside config.vim in configModule, but this example will not cover that extensively.

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    home-manager.url = "github:nix-community/home-manager";
    nvf.url = "github:notashelf/nvf";
  };

  outputs = {nixpkgs, nvf, ...}: let
    system = "x86_64-linux";
    pkgs = nixpkgs.legacyPackages.${system};
    configModule = {
      # Add any custom options (and do feel free to upstream them!)
      # options = { ... };

      config.vim = {
        theme.enable = true;
        # and more options as you see fit...
      };
    };

    customNeovim = nvf.lib.neovimConfiguration {
      inherit pkgs;
      modules = [configModule];
    };
  in {
    # This will make the package available as a flake output under 'packages'
    packages.${system}.my-neovim = customNeovim.neovim;

    # Example nixosConfiguration using the configured Neovim package
    nixosConfigurations = {
      yourHostName = nixpkgs.lib.nixosSystem {
        # ...
        modules = [
          # This will make wrapped neovim available in your system packages
          {environment.systemPackages = [customNeovim.neovim];}
        ];
        # ...
      };
    };
  };
}