{
  stdenv,
  runCommand,
  python3Packages,
  zopfli,
  brotli,
  findutils,
  dart-sass,
}: let
  self = stdenv.mkDerivation {
    name = "e11sync-static";
    src = ../app;
    nativeBuildInputs = [
      python3Packages.django
      python3Packages.django-compressor
      dart-sass
      findutils
    ];
    patchPhase = ''patchShebangs --build manage.py'';
    buildPhase = ''
      export E11SYNC_STATIC_ROOT=$PWD/static
      export E11SYNC_DEBUG=
      export E11SYNC_COMPRESS_OFFLINE=1
      ./manage.py collectstatic
      ./manage.py compress

      find static/ \
          -name '*.css' -or \
          -name '*.js' -or \
          -name '*.svg' | \
          tee >(xargs -n1 -P''$(nproc) ${zopfli}/bin/zopfli) | \
          xargs -n1 -P''$(nproc) ${brotli}/bin/brotli
    '';
    installPhase = ''mv static $out'';

    passthru.manifest = runCommand "e11sync-static-manifest" {} ''
      mkdir -p $out/CACHE
      cp ${self}/CACHE/manifest.json $out/CACHE/
    '';
  };
in
  self