onMessage method

void onMessage(
  1. dynamic callBack(
    1. Map<String, dynamic>? message
    )
)

Adds a callback allowing to retrieve the FCM payload

Implementation

void onMessage(Function(Map<String, dynamic>? message) callBack) {
  _messaging.onMessage(allowInterop((dynamic jsMessageObject) {
    return callBack(
        jsonDecode(stringify(jsMessageObject)) as Map<String, dynamic>?);
  }));
}