Change:
<ins> { lib, stdenv, stdenvNoCC, fetchFromGitHub, rustPlatform, buildGoModule, nix-update-script, modrinth-app-unwrapped, cacert, cargo-tauri, desktop-file-utils, esbuild, darwin, jq, libsoup, moreutils, nodePackages, openssl, pkg-config, webkitgtk, }: rustPlatform.buildRustPackage { pname = "modrinth-app-unwrapped"; version = "0.7.1"; src = fetchFromGitHub { owner = "modrinth"; repo = "theseus"; rev = "v${modrinth-app-unwrapped.version}"; sha256 = "sha256-JWR0e2vOBvOLosr22Oo2mAlR0KAhL+261RRybhNctlM="; }; cargoLock = { lockFile = ./Cargo.lock; outputHashes = { "tauri-plugin-single-instance-0.0.0" = "sha256-Mf2/cnKotd751ZcSHfiSLNe2nxBfo4dMBdoCwQhe7yI="; }; }; pnpm-deps = stdenvNoCC.mkDerivation (finalAttrs: { pname = "${modrinth-app-unwrapped.pname}-pnpm-deps"; inherit (modrinth-app-unwrapped) version src; sourceRoot = "${finalAttrs.src.name}/theseus_gui"; dontConfigure = true; dontBuild = true; doCheck = false; nativeBuildInputs = [ cacert jq moreutils nodePackages.pnpm ]; # https://github.com/NixOS/nixpkgs/blob/763e59ffedb5c25774387bf99bc725df5df82d10/pkgs/applications/misc/pot/default.nix#L56 installPhase = '' export HOME=$(mktemp -d) pnpm config set store-dir "$out" pnpm install --frozen-lockfile --ignore-script --force # remove timestamp and sort json files rm -rf "$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 "$f" done ''; dontFixup = true; outputHashMode = "recursive"; outputHash = "sha256-g/uUGfC9TQh0LE8ed51oFY17FySoeTvfaeEpzpNeMao="; }); nativeBuildInputs = [ cargo-tauri desktop-file-utils nodePackages.pnpm pkg-config ]; buildInputs = [ openssl ] ++ lib.optionals stdenv.isLinux [ libsoup webkitgtk ] ++ lib.optionals stdenv.isDarwin ( with darwin.apple_sdk.frameworks; [ AppKit CoreServices Security WebKit ] ); env = { tauriBundle = { Linux = "deb"; Darwin = "app"; } .${stdenv.hostPlatform.uname.system} or (builtins.throw "No tauri bundle available for ${stdenv.hostPlatform.uname.system}!"); ESBUILD_BINARY_PATH = lib.getExe ( esbuild.override { buildGoModule = args: buildGoModule (args // rec { version = "0.20.2"; src = fetchFromGitHub { owner = "evanw"; repo = "esbuild"; rev = "v${version}"; hash = "sha256-h/Vqwax4B4nehRP9TaYbdixAZdb1hx373dNxNHvDrtY="; }; vendorHash = "sha256-+BfxCyg0KkDQpHt/wycy/8CTG6YBA/VJvJFhhzUnSiQ="; }); } ); }; postPatch = '' export HOME=$(mktemp -d) export STORE_PATH=$(mktemp -d) pushd theseus_gui cp -rT ${modrinth-app-unwrapped.pnpm-deps} "$STORE_PATH" chmod -R +w "$STORE_PATH" pnpm config set store-dir "$STORE_PATH" pnpm install --offline --frozen-lockfile --ignore-script popd ''; buildPhase = '' runHook preBuild cargo tauri build --bundles "$tauriBundle" runHook postBuild ''; installPhase = '' runHook preInstall '' + lib.optionalString stdenv.isDarwin '' mkdir -p "$out"/bin cp -r target/release/bundle/macos "$out"/Applications mv "$out"/Applications/Modrinth App.app/Contents/MacOS/Modrinth App "$out"/bin/modrinth-app ln -s "$out"/bin/modrinth-app "$out"/Applications/Modrinth App.app/Contents/MacOS/Modrinth App '' + lib.optionalString stdenv.isLinux '' cp -r target/release/bundle/"$tauriBundle"/*/data/usr "$out" desktop-file-edit  --set-comment "Modrinth's game launcher"  --set-key="StartupNotify" --set-value="true"  --set-key="Categories" --set-value="Game;ActionGame;AdventureGame;Simulation;"  --set-key="Keywords" --set-value="game;minecraft;mc;"  --set-key="StartupWMClass" --set-value="ModrinthApp"  $out/share/applications/modrinth-app.desktop '' + '' runHook postInstall ''; passthru = { updateScript = nix-update-script { }; }; meta = { description = "Modrinth's game launcher"; longDescription = '' A unique, open source launcher that allows you to play your favorite mods, and keep them up to date, all in one neat little package ''; mainProgram = "modrinth-app"; homepage = "https://modrinth.com"; changelog = "https://github.com/modrinth/theseus/releases/tag/v${modrinth-app-unwrapped.version}"; license = with lib.licenses; [ gpl3Plus unfreeRedistributable ]; maintainers = with lib.maintainers; [ getchoo ]; platforms = with lib; platforms.linux ++ platforms.darwin; # this builds on architectures like aarch64, but the launcher itself does not support them yet broken = !stdenv.isx86_64; }; } </ins>

Discussion:
Project description A game launcher which can be used as a CLI, GUI, and a library for creating and playing modrinth projects Metadata homepage URL: source URL: license: gpl3only platforms: linux, darwin
oh I should probably ping as they have a working package
also tagging this issue on the theseus repo
i would be alright maintaining this; the current working derivation is . i'm merging support for darwin now, so the only real issues i can see are with proper desktop integration (may be sorted by upstream soon) and possibly splitting the package into an unwrapped and wrapped version similar to . i think we should wait for a final stable release though, since as it stands there are some pretty annoying bugs such as the onboarding being a bit broken on both linux and darwin
It should be referred to as "modrinth-app", not "theseus" — theseus is not meant to be a public-facing name
i've renamed it (along with some other fun things :p)