diff --git a/constant-case/constant-case-tests.ts b/constant-case/constant-case-tests.ts
new file mode 100644
index 000000000..b7ac3fe9e
--- /dev/null
+++ b/constant-case/constant-case-tests.ts
@@ -0,0 +1,9 @@
+/// <reference path="constant-case.d.ts" />
+
+import constantCase = require('constant-case');
+
+console.log(constantCase('string')); 	     // => "STRING"
+console.log(constantCase('PascalCase'));     // => "PASCAL_CASE"
+
+console.log(constantCase('myString', 'tr')); // => "MY_STRİNG"
+ 
diff --git a/constant-case/constant-case.d.ts b/constant-case/constant-case.d.ts
new file mode 100644
index 000000000..dfc14ed77
--- /dev/null
+++ b/constant-case/constant-case.d.ts
@@ -0,0 +1,9 @@
+// Type definitions for constant-case
+// Project: https://github.com/blakeembrey/constant-case
+// Definitions by: Sam Saint-Pettersen <https://github.com/stpettersens>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module "constant-case" {
+	function constantCase(string: string, locale?: string): string;
+	export = constantCase;
+}