ServiceExtensionHandler typedef Null safety

Future<ServiceExtensionResponse> ServiceExtensionHandler (
  1. String method,
  2. 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.

Implementation

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