addCallback abstract method

Future<void> addCallback(
  1. String callbackKey,
  2. dynamic callback(
    1. Map<String, Object?> args,
    2. Map<String, Object?> context
    )
)

Implementation

Future<void> addCallback(
    String callbackKey,
    Function(Map<String, Object?> args, Map<String, Object?> context)
        callback);