$scope.$listeners(name) should return array of registered listeners for "name"

[eahutchins]

It would be useful to have a supported API for getting all of the listeners for a particular event. I realize this can be done by walking $rootScope's children and inspecting $$listeners but this seems fragile.

[pkozlowski-opensource]

@eahutchins What would be a use-case? What it would be useful for?

[eahutchins]

For one example: a component could let an event handler handle an error condition if there was at least one listener, else throw an error (this was the case I wanted to use it for in the ui-router project). I could also see it being handy for debugging.

[mnichols]

I'd prefer having an event get emitted when a subscription has been made so I can queue events and control their lifecycle and management independently of $scope .
The use case is for directives which expose meaningful events but are found deeper on the page so subscribers are potentially bound prior to the directive(s) compilation.
The absence of these notifications require each interested component to query state instead of simply making a $scope.$on(...) .