diff --git a/invariant/invariant-tests.ts b/invariant/invariant-tests.ts
new file mode 100644
index 000000000..06a4e9b4e
--- /dev/null
+++ b/invariant/invariant-tests.ts
@@ -0,0 +1,22 @@
+/// <reference path="./invariant.d.ts" />
+
+// will throw in dev mode (process.env.NODE_ENV !== 'production')
+invariant(true);
+
+// will pass in production (process.env.NODE_ENV === 'production')
+invariant(true);
+
+// will pass in dev mode and production mode
+invariant(true, 'Error, error, read all about it');
+
+// will throw in dev mode, and production mode
+invariant(false, 'Some other error');
+
+// will throw in dev mode, and production mode
+invariant(0, 'Some other error');
+
+// will throw in dev mode, and production mode
+invariant('', 'Some other error');
+
+// handles extra variables
+invariant(true, 'Error, error, read all about it', 37, {}, 'hello');
diff --git a/invariant/invariant.d.ts b/invariant/invariant.d.ts
new file mode 100644
index 000000000..6ca967c68
--- /dev/null
+++ b/invariant/invariant.d.ts
@@ -0,0 +1,17 @@
+// Type definitions for invariant 2.2.0
+// Project: https://github.com/zertosh/invariant
+// Definitions by: MichaelBennett <https://github.com/bennett000/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare let invariant:invariant.InvariantStatic;
+
+declare module "invariant" {
+  export = invariant;
+}
+
+declare module invariant {
+  interface InvariantStatic {
+    (testValue:any, format?:string, ...extra:any[]):void;
+  }
+}
+