code: function getFilePathWithHash(filePath, rel) {
    const indexOfLastDot = filePath.lastIndexOf('.');
  
    let filePathWithHash = filePath.substr(0, indexOfLastDot) +
      '.' +
      hashFile.sync(skyPagesConfigUtil.spaPath('src', filePath)) +
      '.' +
      filePath.substr(indexOfLastDot + 1);
  
    if (!rel) {
      const srcPath = skyPagesConfigUtil.spaPath('src');
      filePathWithHash = filePathWithHash.substr(srcPath.length + 1);
    }
  
    return filePathWithHash;
  }
docs: Appends the hash of the specified file to the end of the file path.
  @param {*} filePath The path to the file.
  @param {*} rel Optional Boolean flag indicating whether the returned path should be relative
  to the app's src path.