code: function (data, callback) {
    async.parallel([
      async.apply(readMeta, data)
    ], function (err, results) {
      var pkg = results[0] || {}
  
      var defaults = {
        id: getAppId(pkg.name, pkg.homepage),
        productName: pkg.productName || pkg.name,
        genericName: pkg.genericName || pkg.productName || pkg.name,
        description: pkg.description,
  
        branch: 'master',
        arch: undefined,
  
        base: 'io.atom.electron.BaseApp',
        baseVersion: 'master',
        baseFlatpakref: 'https://s3-us-west-2.amazonaws.com/electron-flatpak.endlessm.com/electron-base-app-master.flatpakref',
        runtime: 'org.freedesktop.Platform',
        runtimeVersion: '1.4',
        runtimeFlatpakref: 'https://raw.githubusercontent.com/endlessm/flatpak-bundler/master/refs/freedesktop-runtime-1.4.flatpakref',
        sdk: 'org.freedesktop.Sdk',
        sdkFlatpakref: 'https://raw.githubusercontent.com/endlessm/flatpak-bundler/master/refs/freedesktop-sdk-1.4.flatpakref',
        finishArgs: [
          // X Rendering
          '--socket=x11', '--share=ipc',
          // Open GL
          '--device=dri',
          // Audio output
          '--socket=pulseaudio',
          // Read/write home directory access
          '--filesystem=home',
          // Chromium uses a socket in tmp for its singleton check
          '--filesystem=/tmp',
          // Allow communication with network
          '--share=network',
          // System notifications with libnotify
          '--talk-name=org.freedesktop.Notifications'
        ],
        modules: [],
  
        bin: pkg.productName || pkg.name || 'electron',
        icon: path.resolve(__dirname, '../resources/icon.png'),
        files: [],
        symlinks: [],
  
        categories: [
          'GNOME',
          'GTK',
          'Utility'
        ],
  
        mimeType: []
      }
  
      callback(err, defaults)
    })
  }
docs: Get the hash of default options for the installer. Some come from the info
  read from `package.json`, and some are hardcoded.