feat: add Nix flake for package distribution

[PJalv]

Summary

• Adds Nix flake for installing mex without requiring npx
• Enables direct integration into NixOS configurations

Features

• buildNpmPackage derivation for the CLI
• NixOS module for easy system integration (programs.mex.enable = true)
• Dev shell with Node.js 22
• Overlay for use in other flakes

Usage

NixOS Configuration

{
  inputs.mex.url = "github:PJalv/mex";
  
  outputs = { nixpkgs, mex, ... }: {
    nixosConfigurations.your-system = nixpkgs.lib.nixosSystem {
      modules = [
        mex.nixosModules.default
        { programs.mex.enable = true; }
      ];
    };
  };
}

Ad-hoc Usage

nix run github:PJalv/mex

Dev Shell

nix develop github:PJalv/mex

[PJalv]

Closing - created with wrong account