added triggerMethod to Marionette.Controller as described https://github.com/marionettejs/backbone.marionette/blob/master/src/controller.js#L33

marionette/marionette.d.ts

@@ -231,6 +231,8 @@ declare module Marionette {
          * @param optionName the name of the option to retrieve.
          */
         getOption(optionName: string): any;
+
+        triggerMethod(name: string, ...args: any[]): any;
     }
 
     interface RegionConstructionOptions {