diff --git a/deep-equal/deep-equal-tests.ts b/deep-equal/deep-equal-tests.ts
index 2f4f238a4f..ed23a35838 100644
--- a/deep-equal/deep-equal-tests.ts
+++ b/deep-equal/deep-equal-tests.ts
@@ -1,8 +1,11 @@
 
-import * as deepEqual from "deep-equal";
+import deepEqual = require("deep-equal");
 
-let isDeepEqual1: boolean = deepEqual({}, {});
-let isDeepEqual2: boolean = deepEqual({}, {}, { strict: true });
-let isDeepEqual3: boolean = deepEqual({}, {}, { strict: false });
+const isDeepEqual1: boolean = deepEqual({}, {});
+const isDeepEqual2: boolean = deepEqual({}, {}, { strict: true });
+const isDeepEqual3: boolean = deepEqual({}, {}, { strict: false });
+const isDeepEqual4: boolean = deepEqual(undefined, undefined);
+const isDeepEqual5: boolean = deepEqual(3, false);
+const isDeepEqual6: boolean = deepEqual("a-string", null);
 
-console.log(isDeepEqual1, isDeepEqual2, isDeepEqual3);
+console.log(isDeepEqual1, isDeepEqual2, isDeepEqual3, isDeepEqual4, isDeepEqual5, isDeepEqual6);
diff --git a/deep-equal/index.d.ts b/deep-equal/index.d.ts
index eef762a4ea..d9c4b5f6cf 100644
--- a/deep-equal/index.d.ts
+++ b/deep-equal/index.d.ts
@@ -1,17 +1,15 @@
-// Type definitions for deep-equal
+// Type definitions for deep-equal 1.0
 // Project: https://github.com/substack/node-deep-equal
-// Definitions by: remojansen <https://github.com/remojansen>
+// Definitions by: remojansen <https://github.com/remojansen>, Jay Anslow <http://github.com/janslow>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-
-
 interface DeepEqualOptions {
     strict: boolean;
 }
 
-declare let deepEqual: (
-    actual: Object,
-    expected: Object,
-    opts?: DeepEqualOptions) => boolean;
+declare function deepEqual(
+    actual: any,
+    expected: any,
+    opts?: DeepEqualOptions): boolean;
 
 export = deepEqual;
diff --git a/deep-equal/tsconfig.json b/deep-equal/tsconfig.json
index b192443e3f..6d21a4a7e6 100644
--- a/deep-equal/tsconfig.json
+++ b/deep-equal/tsconfig.json
@@ -7,7 +7,7 @@
         ],
         "noImplicitAny": true,
         "noImplicitThis": true,
-        "strictNullChecks": false,
+        "strictNullChecks": true,
         "baseUrl": "../",
         "typeRoots": [
             "../"
diff --git a/deep-equal/tslint.json b/deep-equal/tslint.json
new file mode 100644
index 0000000000..f9e30021f4
--- /dev/null
+++ b/deep-equal/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": "../tslint.json"
+}