sendMessage method Null safety

Future<void> sendMessage(
  1. {String? to,
  2. Map<String, String>? data,
  3. String? collapseKey,
  4. String? messageId,
  5. String? messageType,
  6. int? ttl}
)

Send a new RemoteMessage to the FCM server. Android only.

Implementation

Future<void> sendMessage({
  String? to,
  Map<String, String>? data,
  String? collapseKey,
  String? messageId,
  String? messageType,
  int? ttl,
}) {
  if (ttl != null) {
    assert(ttl >= 0);
  }
  return _delegate.sendMessage(
    to: to ?? '${app.options.messagingSenderId}@fcm.googleapis.com',
    data: data,
    collapseKey: collapseKey,
    messageId: messageId,
    messageType: messageType,
    ttl: ttl,
  );
}