docs: function (directory) {
          // Globs match content in the root or inside a single directory
          var extMatchesBase = glob.sync(this.getExtensionGlob(this.getExtensions(), ROOT_OR_SINGLE_DIR), {cwd: directory}),
              extMatchesAll = glob.sync(
                  this.getExtensionGlob(this.getExtensions(), ALL_DIRS), {cwd: directory}
              ),
              dirMatches = glob.sync(
                  this.getDirectoryGlob(this.getDirectories(), ROOT_OR_SINGLE_DIR), {cwd: directory}
              ),
              oldRoonMatches = glob.sync(this.getDirectoryGlob(['drafts', 'published', 'deleted'], ROOT_OR_SINGLE_DIR),
                  {cwd: directory});
  
          // This is a temporary extra message for the old format roon export which doesn't work with Ghost
          if (oldRoonMatches.length > 0) {
              throw new common.errors.UnsupportedMediaTypeError({message: common.i18n.t('errors.data.importer.index.unsupportedRoonExport')});
          }
  
          // If this folder contains importable files or a content or images directory
          if (extMatchesBase.length > 0 || (dirMatches.length > 0 && extMatchesAll.length > 0)) {
              return true;
          }
  
          if (extMatchesAll.length < 1) {
              throw new common.errors.UnsupportedMediaTypeError({message: common.i18n.t('errors.data.importer.index.noContentToImport')});
          }
  
          throw new common.errors.UnsupportedMediaTypeError({message: common.i18n.t('errors.data.importer.index.invalidZipStructure')});
      }