getCoverArt function Null safety

Future<Cover?> getCoverArt(
  1. String mangaID
)

Implementation

Future<Cover?> getCoverArt(String mangaID) async {
  var response = await getCoverArtResponse(mangaID);
  var headers = response.headers;
  if (headers['x-ratelimit-remaining'] == '0') {
    print('Rate Limit Exceeded.');
  } else {
    return Cover.fromJson(jsonDecode(response.body));
  }
}