diff --git a/js-data/js-data-tests.ts b/js-data/js-data-tests.ts
index 1cb3e8e728..a6ac09a42d 100644
--- a/js-data/js-data-tests.ts
+++ b/js-data/js-data-tests.ts
@@ -90,13 +90,13 @@ var UserWithComputedProperty = store.defineResource<IUserWithComputedProperty>({
     computed: {
         // each function's argument list defines the fields
         // that the computed property depends on
-        fullName: ['first', 'last', function (first: string, last: string) {
+        fullName: ['first', 'last', function (first:string, last:string) {
             return first + ' ' + last;
         }],
         // shortand, use the array syntax above if you want
         // you computed properties to work after you've
         // minified your code. Shorthand style won't work when minified
-        initials: function (first: string, last: string) {
+        initials: function (first:string, last:string) {
             return first.toUpperCase()[0] + '. ' + last.toUpperCase()[0] + '.';
         }
     }
@@ -490,4 +490,33 @@ module CustomAdapterTest {
     var store = new JSData.DS();
     store.registerAdapter('mca', new MyCustomAdapter(), {default: true});
     // the data store will now use your custom adapter by default
-}
\ No newline at end of file
+}
+
+/**
+ * showing the use of open ended interface to realize typings
+ * on the Datastore.definitions object where all resource definitions
+ * are saved.
+ */
+
+interface MyCustomDataStore {
+
+    myResource: JSData_.DSResourceDefinition<MyResourceDefinition>
+}
+
+interface MyResourceDefinition {
+
+}
+
+module JSData_ {
+
+    interface DS {
+
+        definitions: MyCustomDataStore;
+    }
+}
+
+var store = new JSData.DS();
+
+var myResourceDefinition = store.defineResource<MyResourceDefinition>('myResource');
+
+myResourceDefinition = store.definitions.myResource;
\ No newline at end of file
diff --git a/js-data/js-data.d.ts b/js-data/js-data.d.ts
index 13fc5e6910..b7271c4e23 100644
--- a/js-data/js-data.d.ts
+++ b/js-data/js-data.d.ts
@@ -16,7 +16,7 @@
 // defining what exists in JSData and how it looks
 declare module JSData_ {
 
-    class JSDataPromise<R> extends Promise<R> {
+    interface JSDataPromise<R> extends Promise<R> {
 
         // enhanced with finally
         finally<U>(finallyCb?:() => U):Promise<U>;
@@ -30,6 +30,10 @@ declare module JSData_ {
         // rather undocumented
         errors:DSErrors;
 
+        // those are objects containing the defined resources and adapters
+        definitions:any;
+        adapters:any;
+
         defaults:DSConfiguration;
 
         changeHistory(resourceName:string, id?:string):Array<Object>;
@@ -394,7 +398,8 @@ declare module JSData_ {
 
 // declaring the existing global js object
 declare var JSData:{
-    DS: JSData_.DS
+    DS: JSData_.DS;
+    DSErrors: JSData_.DSErrors;
 };
 
 //Support node require