Add typing.

src/operations/operation.controller.ts

@@ -5,6 +5,7 @@ import { Observable } from 'rxjs/Rx';
 
 import { ToastrService } from 'ngx-toastr';
 
+import { AccountService } from '../accounts/account.service';
 import { Operation } from './operation';
 import { OperationService } from './operation.service';
 
@@ -13,7 +14,7 @@ module.exports = function(
     accountIdService,
     toastrService: ToastrService,
     operationService: OperationService,
-    AccountService
+    AccountService: AccountService
 ){
     var vm = this;