public function replaceInFile($source, $original, $replacement) {
    $source_path = $this->getRepoRoot() . '/' . $source;
    if ($this->getFileSystem()->exists($source)) {
      $contents = file_get_contents($source_path);
      $new_contents = str_replace($original, $replacement, $contents);
      file_put_contents($source_path, $new_contents);
    }
  }