diff --git a/README.md b/README.md
index 395547a6b7..801bb6948a 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,7 @@ List of Definitions
 * [Gamepad](http://www.w3.org/TR/gamepad/) (by [Kon](http://phyzkit.net/))
 * [glDatePicker](http://glad.github.com/glDatePicker/) (by [D�niel Tar](https://github.com/qcz))
 * [GreenSock Animation Platform (GSAP)](http://www.greensock.com/get-started-js/) (by [Robert S.](https://github.com/codeBelt))
+* [Grunt JS](http://gruntjs.com/) (by [Basarat Ali Syed](https://github.com/basarat))
 * [Google App Engine Channel API](https://developers.google.com/appengine/docs/java/channel/javascript) (by [vvakame](https://github.com/vvakame))
 * [GoogleMaps](https://developers.google.com/maps/) (by [Esben Nepper](https://github.com/eNepper))
 * [Google Geolocation](https://code.google.com/p/geo-location-javascript/) (by [Vincent Bortone](https://github.com/vbortone))
diff --git a/gruntjs/gruntjs-tests.ts b/gruntjs/gruntjs-tests.ts
new file mode 100644
index 0000000000..e766a52f33
--- /dev/null
+++ b/gruntjs/gruntjs-tests.ts
@@ -0,0 +1,28 @@
+/// <reference path="gruntjs.d.ts" />
+
+// Official code sample from 
+// http://gruntjs.com/getting-started#an-example-gruntfile
+
+module.exports = function (grunt) {
+
+    // Project configuration.
+    grunt.initConfig({
+        pkg: grunt.file.readJSON('package.json'),
+        uglify: {
+            options: {
+                banner: '/*! <%= pkg.name %> <%= grunt.template.today("yyyy-mm-dd") %> */\n'
+            },
+            build: {
+                src: 'src/<%= pkg.name %>.js',
+                dest: 'build/<%= pkg.name %>.min.js'
+            }
+        }
+    });
+
+    // Load the plugin that provides the "uglify" task.
+    grunt.loadNpmTasks('grunt-contrib-uglify');
+
+    // Default task(s).
+    grunt.registerTask('default', ['uglify']);
+
+};
\ No newline at end of file
diff --git a/gruntjs/gruntjs.d.ts b/gruntjs/gruntjs.d.ts
new file mode 100644
index 0000000000..5ff8eab9f6
--- /dev/null
+++ b/gruntjs/gruntjs.d.ts
@@ -0,0 +1,165 @@
+// Type definitions for Grunt JS
+// Project: http://gruntjs.com/
+// Definitions by: Basarat Ali Syed <https://github.com/basarat>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+
+////////////////
+/// To add plugins update the IGruntConfig using open ended interface syntax
+////////////////
+interface IGruntConfig{
+    pkg: any;
+}
+
+////////////////
+/// Sample grunt plugin definition: 
+/// uglify : https://github.com/gruntjs/grunt-contrib-uglify
+////////////////
+interface IGruntUglifyConfig{
+    mangle?: bool;
+    compress?: bool;
+    beautify?: bool;
+    report?: any; // false / 'min' / 'gzip'
+    sourceMap?: any; // String / Function 
+    sourceMapRoot?: string;
+    sourceMapIn?: string;
+    sourceMappingURL?: any; // String / Function
+    sourceMapPrefix?: number;
+    wrap?: string;
+    exportAll?: bool;
+    preserveComments?: any; // bool / string / function 
+    banner?: string;
+}
+interface IGruntConfig{
+    uglify?: {
+        options?: IGruntUglifyConfig;
+        build?: {
+            src: string;
+            dest: string;
+        }
+    }
+}
+
+
+////////////////
+// Main Grunt object 
+// http://gruntjs.com/api/grunt
+////////////////
+interface IGrunt{
+    // Config
+    config: IGruntConfigObject;
+    initConfig(config?: IGruntConfig);
+
+
+    // Tasks
+    task: any;
+    // Creating
+    registerTask: Function;
+    registerMultiTask: Function;
+    renameTask: Function;
+    // Loading
+    loadTasks: Function;
+    loadNpmTasks: Function;
+
+    // Errors
+    warn: Function;
+    fatal: Function;
+
+    // Misc: 
+    package: any;
+    version: any;
+
+    // File
+    file: IGruntFileObject;
+
+    // Event
+    event: any;
+    // Fail
+    fail: any;
+    // Log
+    log: any;
+    // Options
+    option: any;
+    // Template
+    template: any;
+    // Util
+    util: any;
+}
+
+////////////////
+/// Grunt Config object
+/// http://gruntjs.com/api/grunt.config#accessing-config-data
+////////////////
+interface IGruntConfigObject{
+    (...param: any[]): any;
+    init: (config?: IGruntConfig) => void;
+    get: Function;
+    process: Function;
+    getRaw: Function;
+    set: Function;
+    escape: (propString: string) => void;
+    requires: Function;
+}
+
+////////////////
+// Grunt File object
+// http://gruntjs.com/api/grunt.file
+////////////////
+interface IGruntFileObjectOptionsSimple{
+    encoding?: string;
+}
+interface IGruntFileObjectOptions extends IGruntFileObjectOptionsSimple{
+    process?: Function;
+    noProcess?: any;
+}
+interface IGruntFileObject{
+
+    // Character encoding
+    defaultEncoding: string;
+
+    // Reading and writing
+    read(filepath, options?: IGruntFileObjectOptionsSimple);
+    readJSON(filepath, options?: IGruntFileObjectOptionsSimple);
+    readYAML(filepath, options?: IGruntFileObjectOptionsSimple);
+    write(filepath, contents, options?: IGruntFileObjectOptionsSimple);
+    copy(srcpath, destpath, options?: IGruntFileObjectOptions);
+    delete(filepath, options?: { force?: bool; });
+
+    // Directories
+    mkdir(dirpath, mode?);
+    recurse(rootdir, callback);
+
+    // Globbing patterns
+    expand(patterns);
+    expand(options, patterns);
+    expandMapping(patterns, dest, options?);
+    match(patterns, filepaths);
+    match(options, patterns, filepaths);
+    isMatch(patterns, filepaths): bool;
+    isMatch(options, patterns, filepaths): bool;
+
+    // file types
+    exists(...paths: any[]);
+    isLink(...paths: any[]);
+    isDir(...paths: any[]);
+    isFile(...paths: any[]);
+
+    // paths
+    isPathAbsolute(...paths: any[]);
+    arePathsEquivalent(...paths: any[]);
+    isPathCwd(...paths: any[]);
+    setBase(...paths: any[]);
+
+    // External libraries
+    glob: any;
+    minimatch: any;
+    findup: any;
+}
+
+
+////////////////
+/// Globally called export function module.exports
+////////////////
+declare var module : {
+    exports: {(grunt: IGrunt): void;};
+}
\ No newline at end of file