code: function requireUsed(files) {
    if (files) {
      var filePattern;
  
      for (var i = files.length; i > 0; i--) {
        filePattern = files[i] && files[i].pattern;
  
        if (typeof filePattern === 'string' && (filePattern.indexOf('\\karma-requirejs\\') !== -1 || filePattern.indexOf('/karma-requirejs/') !== -1)) {
          return true;
        }
        if (typeof filePattern === 'string' && (filePattern.indexOf('\\karma-cajon\\') !== -1 || filePattern.indexOf('/karma-cajon/') !== -1)) {
          return true;
        }
      }
    }
  
    return false;
  }
docs: TODO Do not expect require to be included before plugins