Component controller can be array

angular.module(.....).component("componentName", {
  controller: ["$rootScope",function($rootScope) {
}],
  template: ....
}

angularjs/angular.d.ts

@@ -1685,7 +1685,7 @@ declare module angular {
          * Controller constructor function that should be associated with newly created scope or the name of a registered
          * controller if passed as a string. Empty function by default.
          */
-        controller?: string | Function;
+        controller?: any;
         /**
          * An identifier name for a reference to the controller. If present, the controller will be published to scope under
          * the controllerAs name. If not present, this will default to be the same as the component name.