{  pkgs ? import <nixpkgs> { },}:let  inherit (pkgs) lib;inpkgs.mkShell rec {  packages =    [      pkgs.clang      pkgs.curl      pkgs.cmake      pkgs.perl      pkgs.pkg-config      pkgs.protobuf      pkgs.rustPlatform.bindgenHook      pkgs.rust-analyzer    ]    ++ lib.optionals pkgs.stdenv.hostPlatform.isLinux [      pkgs.mold    ];   buildInputs =    [      pkgs.curl      pkgs.fontconfig      pkgs.freetype      pkgs.libgit2      pkgs.openssl      pkgs.sqlite      pkgs.zlib      pkgs.zstd      pkgs.rustToolchain    ]    ++ lib.optionals pkgs.stdenv.hostPlatform.isLinux [      pkgs.alsa-lib      pkgs.libxkbcommon      pkgs.wayland      pkgs.xorg.libxcb      pkgs.vulkan-loader    ]    ++ lib.optional pkgs.stdenv.hostPlatform.isDarwin pkgs.apple-sdk_15;   # We set SDKROOT and DEVELOPER_DIR to the Xcode ones instead of the nixpkgs ones,  # because we need Swift 6.0 and nixpkgs doesn't have it.  # Xcode is required for development anyways  shellHook =    ''      export LD_LIBRARY_PATH="${lib.makeLibraryPath buildInputs}:$LD_LIBRARY_PATH"      export PROTOC="${pkgs.protobuf}/bin/protoc"    ''    + lib.optionalString pkgs.stdenv.hostPlatform.isDarwin ''      export SDKROOT="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk";      export DEVELOPER_DIR="/Applications/Xcode.app/Contents/Developer";    '';   FONTCONFIG_FILE = pkgs.makeFontsConf {    fontDirectories = [      "./assets/fonts/zed-mono"      "./assets/fonts/zed-sans"    ];  };  ZSTD_SYS_USE_PKG_CONFIG = true;}