diff --git a/diff-match-patch/diff-match-patch-tests.ts b/diff-match-patch/diff-match-patch-tests.ts
new file mode 100644
index 000000000..f1e5d2d42
--- /dev/null
+++ b/diff-match-patch/diff-match-patch-tests.ts
@@ -0,0 +1,32 @@
+///<reference path="./diff-match-patch.d.ts" />
+
+import DiffMatchPatch = require("diff-match-patch");
+
+var oldValue = "hello world, how are you?";
+var newValue = "hello again world. how have you been?";
+
+var diffEngine = new DiffMatchPatch.diff_match_patch();
+var diffs = diffEngine.diff_main(oldValue, newValue);
+diffEngine.diff_cleanupSemantic(diffs);
+
+var changes = "";
+var pattern = "";
+
+diffs.forEach(function(diff) {
+    var operation = diff[0]; // Operation (insert, delete, equal)
+    var text = diff[1]; // Text of change
+    
+    switch (operation) {
+        case DiffMatchPatch.DIFF_INSERT:
+            pattern += "I";
+            break;
+        case DiffMatchPatch.DIFF_DELETE:
+            pattern += "D";
+            break;
+        case DiffMatchPatch.DIFF_EQUAL:
+            pattern += "E";
+            break;
+    }
+
+    changes += text;
+});
diff --git a/diff-match-patch/diff-match-patch.d.ts b/diff-match-patch/diff-match-patch.d.ts
new file mode 100644
index 000000000..63bf7eaa0
--- /dev/null
+++ b/diff-match-patch/diff-match-patch.d.ts
@@ -0,0 +1,39 @@
+// Type definitions for diff-match-patch v1.0.0
+// Project: https://www.npmjs.com/package/diff-match-patch
+// Definitions by: Asana <https://asana.com>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module "diff-match-patch" {
+    type Diff = [number, string];
+
+    export class diff_match_patch {
+        static new (): diff_match_patch;
+
+        Diff_Timeout: number;
+        Diff_EditCost: number;
+        Match_Threshold: number;
+        Match_Distance: number;
+        Patch_DeleteThreshold: number;
+        Patch_Margin: number;
+        Match_MaxBits: number;
+
+        diff_main(text1: string, text2: string, opt_checklines?: boolean, opt_deadline?: number): Diff[];
+        diff_commonPrefix(text1: string, text2: string): number;
+        diff_commonSuffix(text1: string, text2: string): number;
+        diff_cleanupSemantic(diffs: Diff[]): void;
+        diff_cleanupSemanticLossless(diffs: Diff[]): void;
+        diff_cleanupEfficiency(diffs: Diff[]): void;
+        diff_cleanupMerge(diffs: Diff[]): void;
+        diff_xIndex(diffs: Diff[], loc: number): number;
+        diff_prettyHtml(diffs: Diff[]): string;
+        diff_text1(diffs: Diff[]): string;
+        diff_text2(diffs: Diff[]): string;
+        diff_levenshtein(diffs: Diff[]): number;
+        diff_toDelta(diffs: Diff[]): string;
+        diff_fromDelta(text1: string, delta: string): Diff[];
+    }
+
+    export var DIFF_DELETE: number;
+    export var DIFF_INSERT: number;
+    export var DIFF_EQUAL: number;
+}