package webextension_polyfill.webnavigation; /** Fired when a new window, or a new tab in an existing window, is created to host a navigation. **/ typedef OnCreatedNavigationTargetEvent = { /** Registers an event listener callback to an event. **/ function addListener(callback:(details:OnCreatedNavigationTargetDetailsType) -> Void, ?filters:EventUrlFilters):Void; /** Deregisters an event listener callback from an event. **/ function removeListener(callback:(details:OnCreatedNavigationTargetDetailsType) -> Void):Void; function hasListener(callback:(details:OnCreatedNavigationTargetDetailsType) -> Void):Bool; function hasListeners():Bool; };