{  description = "High-performance, multiplayer code editor from the creators of Atom and Tree-sitter";   inputs = {    nixpkgs.url = "github:NixOS/nixpkgs?ref=nixos-unstable";  };   outputs =    { self, nixpkgs }:    let      inherit (self) outputs;      systems = [        "aarch64-linux"        "x86_64-linux"        "aarch64-darwin"        "x86_64-darwin"      ];      forAllSystems = nixpkgs.lib.genAttrs systems;    in    {      devShells = forAllSystems (        system:        let          pkgs = import nixpkgs { inherit system; };        in        {          default = import ./shell.nix { inherit pkgs; };        }      );    };}