diff --git a/aio/src/app/documents/document-contents.ts b/aio/src/app/documents/document-contents.ts
new file mode 100644
index 0000000000..80b03a4f2e
--- /dev/null
+++ b/aio/src/app/documents/document-contents.ts
@@ -0,0 +1,4 @@
+export interface DocumentContents {
+  title: string;
+  contents: string;
+}
diff --git a/aio/src/app/documents/document.service.ts b/aio/src/app/documents/document.service.ts
index bbc68ea013..3a8845c8e0 100644
--- a/aio/src/app/documents/document.service.ts
+++ b/aio/src/app/documents/document.service.ts
@@ -7,14 +7,11 @@ import 'rxjs/add/operator/switchMap';
 
 import { LocationService } from 'app/shared/location.service';
 import { Logger } from 'app/shared/logger.service';
+import { DocumentContents } from './document-contents';
+export { DocumentContents } from './document-contents';
 
 const FILE_NOT_FOUND_URL = 'file-not-found';
 
-export interface DocumentContents {
-  title: string;
-  contents: string;
-}
-
 @Injectable()
 export class DocumentService {
 
diff --git a/aio/src/app/navigation/navigation-node.ts b/aio/src/app/navigation/navigation-node.ts
new file mode 100644
index 0000000000..32fad09bae
--- /dev/null
+++ b/aio/src/app/navigation/navigation-node.ts
@@ -0,0 +1,7 @@
+export interface NavigationNode {
+  url?: string;
+  title?: string;
+  tooltip?: string;
+  target?: string;
+  children?: NavigationNode[];
+}
diff --git a/aio/src/app/navigation/navigation.service.ts b/aio/src/app/navigation/navigation.service.ts
index 6ddda0b8ee..652880c140 100644
--- a/aio/src/app/navigation/navigation.service.ts
+++ b/aio/src/app/navigation/navigation.service.ts
@@ -7,13 +7,8 @@ import 'rxjs/add/operator/publish';
 import { Logger } from 'app/shared/logger.service';
 import { LocationService } from 'app/shared/location.service';
 
-export interface NavigationNode {
-  url?: string;
-  title?: string;
-  tooltip?: string;
-  target?: string;
-  children?: NavigationNode[];
-}
+import { NavigationNode } from './navigation-node';
+export { NavigationNode } from './navigation-node';
 
 export interface NavigationViews {
   [name: string]: NavigationNode[];