code: function normalizeDirectoryEntries(entries, directory, supportedConfigs) {
      const fileHash = {};
  
      entries.forEach(entry => {
          if (supportedConfigs.indexOf(entry) >= 0) {
              const resolvedEntry = path.resolve(directory, entry);
  
              if (fs.statSync(resolvedEntry).isFile()) {
                  fileHash[entry] = resolvedEntry;
              }
          }
      });
      return fileHash;
  }
docs: Create a hash of filenames from a directory listing
  @param {string[]} entries Array of directory entries.
  @param {string} directory Path to a current directory.
  @param {string[]} supportedConfigs List of support filenames.
  @returns {Object} Hashmap of filenames