ServiceExtensionHandler typedef Null safety

ServiceExtensionHandler = Future<ServiceExtensionResponse> Function(String method, Map<String, String> parameters)

A service protocol extension handler. Registered with registerExtension.

Must complete to a ServiceExtensionResponse. method is the method name of the service protocol request, and parameters is a map holding the parameters to the service protocol request.

NOTE: all parameter names and values are encoded as strings.


typedef Future<ServiceExtensionResponse> ServiceExtensionHandler(
    String method, Map<String, String> parameters);