code: function getOldProjectName(projectDir) {
    var files = [];
    try {
      files = fs.readdirSync(projectDir);
    } catch (err) {
      return '';
    }
  
    var projectFile = '';
    files.forEach(function(fileName) {
      if (path.extname(fileName) === '.xcodeproj') {
        projectFile = path.basename(fileName, '.xcodeproj');
      }
    });
  
    return projectFile;
  }
docs: region Private API 
  Get old name of the project.
  Name is detected by the name of the .xcodeproj file.
  
  @param {String} projectDir absolute path to ios project directory
  @return {String} old project name