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);
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https://api.dart.dev/stable/2.5.0/dart-developer/ServiceExtensionHandler.html