class ActionDispatch::Routing::RouteSet::Dispatcher

def controller(req)

Experimental RBS support (using type sampling data from the type_fusion project). 

def controller: (ActionDispatch::Request req) -> Class

This signature was generated using 1 sample from 1 application. 

def controller(req)
  req.controller_class
rescue NameError => e
  raise ActionController::RoutingError, e.message, e.backtrace
end