diff --git a/rewire/rewire-tests.ts b/rewire/rewire-tests.ts
new file mode 100644
index 000000000..3e81050e4
--- /dev/null
+++ b/rewire/rewire-tests.ts
@@ -0,0 +1,48 @@
+/// <reference path="rewire.d.ts" />
+
+var myModule = rewire("../lib/myModule.js");
+
+myModule.__set__("path", "/dev/null");
+myModule.__get__("path"); // = '/dev/null'
+
+var fsMock = {
+    readFile: function (path: string, encoding: string, cb: Function) {
+        cb(null, "Success!");
+    }
+};
+myModule.__set__("fs", fsMock);
+
+myModule.__set__({
+    fs: fsMock,
+    path: "/dev/null"
+});
+
+myModule.__set__({
+    console: {
+        log: function () { /* be quiet */ }
+    },
+    process: {
+        argv: ["testArg1", "testArg2"]
+    }
+});
+
+var revert = myModule.__set__("port", 3000);
+
+// port is now 3000
+revert();
+// port is now the previous value
+
+myModule.__with__({
+    port: 3000
+})(function () {
+    // within this function port is 3000
+});
+// now port is the previous value again
+
+myModule.__with__({
+    port: 3000
+})(function () {
+}).then(function () {
+    // now port is the previous value again
+});
+// port is still 3000 here because the promise hasn't been resolved yet
diff --git a/rewire/rewire.d.ts b/rewire/rewire.d.ts
new file mode 100644
index 000000000..78ece94ee
--- /dev/null
+++ b/rewire/rewire.d.ts
@@ -0,0 +1,38 @@
+// Type definitions for rewire v2.5.1
+// Project: https://github.com/jhnns/rewire
+// Definitions by: Borislav Zhivkov <https://github.com/borislavjivkov>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module RewireInterfaces {
+    interface Rewire {
+        /**
+         * Returns a rewired version of the module found at filename. Use rewire() exactly like require().
+         */
+        (filename: string): RewiredModule;
+    }
+    
+    interface RewiredModule {
+        /**
+         * Takes all enumerable keys of obj as variable names and sets the values respectively. Returns a function which can be called to revert the change.
+         */
+        __set__(obj: Object): Function;
+        /**
+         * Sets the internal variable name to the given value. Returns a function which can be called to revert the change.
+         */
+        __set__(name: string, value: any): Function;
+        /**
+         * Returns the private variable with the given name.
+         */
+        __get__(name: string): any;
+        /**
+         * Returns a function which - when being called - sets obj, executes the given callback and reverts obj. If callback returns a promise, obj is only reverted after
+         * the promise has been resolved or rejected. For your convenience the returned function passes the received promise through.
+         */
+        __with__(obj: Object): (callback: Function) => any;
+    }
+}
+
+declare var rewire: RewireInterfaces.Rewire;
+declare module "rewire" {
+    export = rewire;
+}