code: function ensureFileExists(filePath) {
    fs.access(filePath, err => {
      if (err) {
        log.errorAndExit(
          'This file ^^^ does not exist and it was referenced in package.json for that component, please make sure the file path is correct.',
          filePath,
        );
      }
    });
  }
docs: Ensure a file exists
  We don't want to do anything with the file now, we just want to provide an early error if a path is wrong.
  This is called async and by the time an error is thrown, we may be several steps ahead with WebPack probably already trying to start - that's ok, we don't want to hold up the process everytime things are correct.
  @param filePath {string} - Path to file to ensure exists