async function fileExists(filePath) {
  let exists = true;
  try {
    await fs.promises.stat(filePath);
  } catch {
    exists = false;
  }
  return exists;
}
Check if file exists at specified path.
@param  {string}           filePath  - File path to check existence of
@returns {Promise<boolean>}           `true` if exists, otherwise `false`