feishin: Clean up darwin build

      # electron-builder appears to build directly on top of Electron.app, by overwriting the files in the bundle.

      cp -r ${electron.dist}/Electron.app ./

      find ./Electron.app -name 'Info.plist' | xargs -d '\n' chmod +rw

      # Disable code signing during build on macOS.

      # https://github.com/electron-userland/electron-builder/blob/fa6fc16/docs/code-signing.md#how-to-disable-code-signing-during-the-build-process-on-macos

      export CSC_IDENTITY_AUTO_DISCOVERY=false

      sed -i "/afterSign/d" package.json

    ''

    + ''

      npm exec electron-builder -- \

        --dir \

        -c.electronDist=${if stdenv.hostPlatform.isDarwin then "./" else electron.dist} \

        -c.electronVersion=${electron.version} \

        -c.npmRebuild=false

        -c.npmRebuild=false \

        ${lib.optionalString stdenv.hostPlatform.isDarwin "-c.mac.identity=null"}

    '';

  installPhase = ''