Change:
<ins> { lib , stdenv , stdenvNoCC , fetchFromGitHub , substituteAll , makeWrapper , makeDesktopItem , copyDesktopItems , vencord , electron , pipewire , libicns , jq , moreutils , nodePackages }: stdenv.mkDerivation rec { pname = "vesktop"; version = "0.3.3"; src = fetchFromGitHub { owner = "Vencord"; repo = "Vesktop"; rev = "v${version}"; sha256 = "sha256-Njs3tACxUyRolYUtS/q2lITIQnUBFXVXWZEfQ66HpPM="; }; pnpm-deps = stdenvNoCC.mkDerivation { pname = "${pname}-pnpm-deps"; inherit src version patches ELECTRON_SKIP_BINARY_DOWNLOAD; nativeBuildInputs = [ jq moreutils nodePackages.pnpm ]; # https://github.com/NixOS/nixpkgs/blob/763e59ffedb5c25774387bf99bc725df5df82d10/pkgs/applications/misc/pot/default.nix#L56 installPhase = '' export HOME=$(mktemp -d) pnpm config set store-dir $out pnpm install --frozen-lockfile --ignore-script rm -rf $out/v3/tmp for f in $(find $out -name "*.json"); do sed -i -E -e 's/"checkedAt":[0-9]+,//g' $f jq --sort-keys . $f | sponge $f done ''; dontFixup = true; outputHashMode = "recursive"; outputHash = "sha256-vInaSLGahRUgvwAeUcI+oV84L+tgNRCmfFpE0aUD4X4="; }; nativeBuildInputs = [ copyDesktopItems nodePackages.pnpm nodePackages.nodejs makeWrapper ]; patches = [ (substituteAll { inherit vencord; src = ./use_system_vencord.patch; }) ]; ELECTRON_SKIP_BINARY_DOWNLOAD = 1; preBuild = '' export HOME=$(mktemp -d) export STORE_PATH=$(mktemp -d) cp -r ${pnpm-deps}/* "$STORE_PATH" chmod -R +w "$STORE_PATH" pnpm config set store-dir "$STORE_PATH" pnpm install --offline --frozen-lockfile --ignore-script patchShebangs node_modules/{*,.*} ''; postBuild = '' pnpm build # using `pnpm exec` here apparently makes it ignore ELECTRON_SKIP_BINARY_DOWNLOAD ./node_modules/.bin/electron-builder  --dir  -c.electronDist=${electron}/libexec/electron  -c.electronVersion=${electron.version} ''; # this is consistent with other nixpkgs electron packages and upstream, as far as I am aware # yes, upstream really packages it as "vesktop" but uses "vencorddesktop" file names installPhase = let libPath = lib.makeLibraryPath [ pipewire ]; in '' runHook preInstall mkdir -p $out/opt/Vesktop/resources cp dist/linux-unpacked/resources/app.asar $out/opt/Vesktop/resources pushd build ${libicns}/bin/icns2png -x icon.icns for file in icon_*x32.png; do file_suffix=''${file//icon_} install -Dm0644 $file $out/share/icons/hicolor/''${file_suffix//x32.png}/apps/vencorddesktop.png done makeWrapper ${electron}/bin/electron $out/bin/vencorddesktop  --prefix LD_LIBRARY_PATH : ${libPath}  --add-flags $out/opt/Vesktop/resources/app.asar  --add-flags "''${NIXOS_OZONE_WL:+''${WAYLAND_DISPLAY:+--ozone-platform-hint=auto --enable-features=WaylandWindowDecorations}}" runHook postInstall ''; desktopItems = [ (makeDesktopItem { name = "vencorddesktop"; desktopName = "Vesktop"; exec = "vencorddesktop %U"; icon = "vencorddesktop"; startupWMClass = "VencordDesktop"; genericName = "Internet Messenger"; keywords = [ "discord" "vencord" "electron" "chat" ]; }) ]; meta = with lib; { description = "An alternate client for Discord with Vencord built-in"; homepage = "https://github.com/Vencord/Vesktop"; license = licenses.gpl3Only; maintainers = with maintainers; [ getchoo Scrumplex vgskye ]; platforms = platforms.linux; mainProgram = "vencorddesktop"; }; } </ins>

Discussion:
Project description Basically just Discord with Vencord pre-installed. There is already a package, but I prefer using Vesktop which is more directly maintained by Vencord for Vencord. Metadata homepage URL: source URL: license: platforms: Linux (Darwin option also exists I think?)
How is this different from below?
It doesn't seem to be fully finished yet, but for a cursory looks, they've some things to be built in into their client: ! ! (Also, I've tried ArmCord as well, but apparently it's currently having some severe electron issue, which from my testing and many reports make it completely unusable right now -- though I'd assume that would be fixed eventually)