Add typings for object-diff. (#11984)

* Add typings for object-diff.

* review comment

* review comment - tsconfig.json

* fix tsc errors

object-diff/index.d.ts

@@ -0,0 +1,7 @@
+// Type definitions for object-diff v0.0
+// Project: https://github.com/srcagency/object-diff
+// Definitions by: Rogier Schouten <https://github.com/rogierschouten>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare function diff(a: any, b: any): any;
+export = diff;

object-diff/object-diff-tests.ts

@@ -0,0 +1,18 @@
+
+import diff = require('object-diff');
+
+// from the package README.md, typescriptified:
+
+var a = {
+    speed: 4,
+    power: 54,
+    level: 1,
+};
+ 
+var b = {
+    speed: 4,			// unchanged 
+    power: 22,			// changed 
+    weight: 10,			// added 
+};
+ 
+var d: any = diff(a, b);

object-diff/tsconfig.json

@@ -0,0 +1,19 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "object-diff-tests.ts"
+    ]
+}