{ jellyfin-web = final: prev: { jellyfin-web = prev.jellyfin-web.overrideAttrs (finalAttrs: previousAttrs: { installPhase = '' runHook preInstall # this is the important line sed -i "s###" dist/index.html mkdir -p $out/share cp -a dist $out/share/jellyfin-web runHook postInstall ''; }); }; }