BlocWidgetBuilder<S>  typedef 
 
        BlocWidgetBuilder<S> =
     Widget Function(BuildContext context, S state)
     
    
Signature for the builder function which takes the BuildContext and
state and is responsible for returning a widget which is to be rendered.
This is analogous to the builder function in StreamBuilder.
Implementation
typedef BlocWidgetBuilder<S> = Widget Function(BuildContext context, S state);