diff --git a/dagre-d3/dagre-d3-tests.ts b/dagre-d3/dagre-d3-tests.ts
new file mode 100644
index 0000000000..e3e068816c
--- /dev/null
+++ b/dagre-d3/dagre-d3-tests.ts
@@ -0,0 +1,19 @@
+/// <reference path="dagre-d3.d.ts"/>
+module DagreD3Tests {
+    var gDagre = new dagreD3.graphlib.Graph();
+    var graph = gDagre.graph();
+
+    // has graph methods from dagre.d.ts
+    graph.setNode("a", {});
+    var num: number = 251 + graph.height + graph.width;
+    var predecessors: { [vertex:string]: string[] } = {};
+    var successors: { [vertex:string]: string[] } = {};
+
+    predecessors["a"] = graph.predecessors("a");
+    successors["a"] = graph.successors("a");
+
+    var render = new dagreD3.render();
+    var svg = d3.select("svg");
+    render(svg, graph);
+}
+
diff --git a/dagre-d3/dagre-d3.d.ts b/dagre-d3/dagre-d3.d.ts
new file mode 100644
index 0000000000..d088d1d829
--- /dev/null
+++ b/dagre-d3/dagre-d3.d.ts
@@ -0,0 +1,31 @@
+// Type definitions for dagre-d3.core.js
+// Project: https://github.com/cpettitt/dagre-d3
+// Definitions by: Mark Wong Siang Kai <https://github.com/markwongsk>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../d3/d3.d.ts"/>
+/// <reference path="../dagre/dagre.d.ts"/>
+
+declare module Dagre {
+
+    interface DagreD3Factory extends Dagre.DagreFactory {
+        render: Render;
+    }
+
+    // coupled with dagre.d.ts' Graph
+    // a lot of these methods come from graphlib.core.js
+    interface Graph {
+        graph(): Graph;
+        height: number;
+        predecessors(id: string): string[];
+        successors(id: string): string[];
+        width: number;
+    }
+
+    interface Render {
+        new (): Render;
+        (selection: D3.Selection, g: Dagre.Graph): void;
+    }
+}
+
+declare var dagreD3: Dagre.DagreD3Factory;