code: function(dir) {
        var results = [];
  
        var list = fs.readdirSync(dir);
  
        list.forEach(function(file) {
          // Check for every given pattern, regardless of whether it is an array or a string
          var matchesSomeExclude = [].concat(options.exclude).some(function(regexp) {
            return file.match(regexp) != null;
          });
  
          if(!matchesSomeExclude) {
            var matchesSomePattern = [].concat(options.match).some(function(regexp) {
              return file.match(regexp) != null;
            });
  
            file = path.resolve(dir, file);
            var stat = fs.statSync(file);
  
            if (stat && stat.isDirectory()) {
              if(matchesSomePattern) {
                results = results.concat(file);
              }
              results = results.concat(walk(file));
            }
          }
        });
  
        return results;
      }
docs: Synchronously walks the directory
  and returns an array of every subdirectory that
  matches the patterns, and doesn't match any exclude pattern