More fixes for 2.4. Not all for weak types:

2.4 also has been inference for generics, which finds more errors as
well.

types/angular/index.d.ts

@@ -1846,6 +1846,10 @@ declare namespace angular {
          * different in Angular 1 there is no direct mapping and care should be taken when upgrading.
          */
         $postLink?(): void;
+
+        // IController implementations frequently do not implement any of its methods.
+        // A string indexer indicates to TypeScript not to issue a weak type error in this case.
+        [s: string]: any;
     }
 
     /**