Node.js 16 Nix flake

flake.nix

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/release-23.05";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          system = "x86_64-linux";
          config = {
            allowUnfree = true;
            permittedInsecurePackages = [ "nodejs-16.20.2" ];
          };
        };
        corepack = pkgs.runCommand "corepack-enable" { } ''
          mkdir -p $out/bin
          ${pkgs.nodejs-16_x}/bin/corepack enable --install-directory $out/bin
        '';
      in
      {
        devShell = with pkgs; pkgs.mkShell {
          buildInputs = [
            act
            pkgs.nodejs-16_x
            corepack
          ];
        };
      });
}