diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 539cbb10f..4ddfab6e4 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -279,6 +279,7 @@ All definitions files include a header with the author and editors, so at some p
 * [mysql](https://github.com/felixge/node-mysql) (by [William Johnston](https://github.com/wjohnsto))
 * [nconf](https://github.com/flatiron/nconf) (by [Jeff Goddard](https://github.com/jedigo))
 * [needle](https://github.com/tomas/needle) (by [San Chen](https://github.com/bigsan))
+* [nexpect](https://github.com/nodejitsu/nexpect) (by [vvakame](https://github.com/vvakame))
 * [noble](https://github.com/sandeepmistry/noble) (by [Seon-Wook Park](https://github.com/swook))
 * [nock](https://github.com/pgte/nock) (by [bonnici](https://github.com/bonnici))
 * [Node.js](http://nodejs.org/) (from TypeScript samples)
diff --git a/nexpect/nexpect-tests.ts b/nexpect/nexpect-tests.ts
new file mode 100644
index 000000000..d58432922
--- /dev/null
+++ b/nexpect/nexpect-tests.ts
@@ -0,0 +1,33 @@
+/// <reference path="./nexpect.d.ts" />
+
+import nexpect = require('nexpect');
+
+nexpect.spawn("echo", ["hello"])
+    .expect("hello")
+    .run((err, stdout, exitcode) => {
+        if (!err) {
+            console.log("hello was echoed");
+        }
+    });
+
+nexpect.spawn("ls -la /tmp/undefined", {stream: 'stderr'})
+    .expect("No such file or directory")
+    .run((err) => {
+        if (!err) {
+            console.log("checked that file doesn't exists");
+        }
+    });
+
+nexpect.spawn("node --interactive")
+    .expect(">")
+    .sendline("console.log('testing')")
+    .expect("testing")
+    .sendline("process.exit()")
+    .run((err) => {
+        if (!err) {
+            console.log("node process started, console logged, process exited");
+        }
+        else {
+            console.log(err)
+        }
+    });
diff --git a/nexpect/nexpect.d.ts b/nexpect/nexpect.d.ts
new file mode 100644
index 000000000..4996c2b4f
--- /dev/null
+++ b/nexpect/nexpect.d.ts
@@ -0,0 +1,35 @@
+// Type definitions for nexpect 0.4.2
+// Project: https://github.com/nodejitsu/nexpect
+// Definitions by: vvakame <http://github.com/vvakame>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module "nexpect" {
+    import child_process = require("child_process");
+
+    function spawn(command:string[], options?:ISpawnOptions):IChain;
+
+    function spawn(command:string, params?:any[], options?:ISpawnOptions):IChain;
+
+    function spawn(command:string, options?:ISpawnOptions):IChain;
+
+    interface IChain {
+        expect(expectation:string):IChain;
+        expect(expectation:RegExp):IChain;
+        wait(expectation:string):IChain;
+        wait(expectation:RegExp):IChain;
+        sendline(line:string):IChain;
+        sendEof():IChain;
+        run(callback:(err:Error, output:string[], exit:any /* string | number */)=>void):child_process.ChildProcess;
+    }
+
+    interface ISpawnOptions {
+        cwd?:string;
+        env?:any;
+        ignoreCase?:any;
+        stripColors?:any;
+        stream?:any;
+        verbose?:any;
+    }
+}