diff --git a/bytes/bytes-tests.ts b/bytes/bytes-tests.ts
new file mode 100644
index 000000000..4a981aee4
--- /dev/null
+++ b/bytes/bytes-tests.ts
@@ -0,0 +1,16 @@
+/// <reference path="./bytes.d.ts"/>
+
+import bytes = require('bytes');
+
+// 1024*1024 = 1048576
+console.log(bytes(104857));
+console.log(bytes(104857, { thousandsSeparator: ' ' }));
+
+console.log(bytes.format(104857));
+console.log(bytes.format(104857, { thousandsSeparator: ' ' }));
+
+console.log(bytes('1024kb'));
+console.log(bytes(1024));
+
+console.log(bytes.parse('1024kb'));
+console.log(bytes.parse(1024));
\ No newline at end of file
diff --git a/bytes/bytes.d.ts b/bytes/bytes.d.ts
new file mode 100644
index 000000000..0d8a63cf7
--- /dev/null
+++ b/bytes/bytes.d.ts
@@ -0,0 +1,62 @@
+// Type definitions for bytes v2.1.0
+// Project: https://github.com/visionmedia/bytes.js
+// Definitions by: Zhiyuan Wang <https://github.com/danny8002/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'bytes' {
+
+    /**
+     *Convert the given value in bytes into a string.
+     *
+     * @param {number} value
+     * @param {{
+     *  thousandsSeparator: [string]
+     *  }} [options] bytes options.
+     *
+     * @returns {string}
+     */
+    function bytes(value: number, options?: { thousandsSeparator: string }): string;
+
+    /**
+     *Parse string to an integer in bytes.
+     *
+     * @param {string} value
+     * @returns {number}
+     */
+    function bytes(value: string): number;
+
+    module bytes {
+
+        /**
+         * Format the given value in bytes into a string.
+         * 
+         * If the value is negative, take Math.abs(). If it is a float,
+         * it is rounded.
+         * 
+         * @param {number} value
+         * @param {BytesFormatOptions} [options]
+         */
+
+        function format(value: number, options?: { thousandsSeparator: string }): string;
+
+        /**
+         * Just return the input number value.
+         * 
+         * @param {number} value
+         * @return {number}
+         */
+        function parse(value: number): number;
+
+        /**
+         * Parse the string value into an integer in bytes.
+         * 
+         * If no unit is given, it is assumed the value is in bytes.
+         * 
+         * @param {string} value
+         * @return {number}
+         */
+        function parse(value: string): number;
+    }
+
+    export = bytes;
+}
\ No newline at end of file
diff --git a/depd/depd-tests.ts b/depd/depd-tests.ts
new file mode 100644
index 000000000..14dfbe72c
--- /dev/null
+++ b/depd/depd-tests.ts
@@ -0,0 +1,54 @@
+/// <reference path="./depd.d.ts"/>
+
+import depd = require('depd');
+
+var deprecate = depd("depd-tests");
+
+function assert(condition: boolean, message: string): void {
+    if (!condition) {
+        throw new Error(message);
+    }
+}
+
+function testDepdMessage(...args: string[]): boolean {
+    if (arguments.length < 1) {
+        deprecate('testDepdMessage argument.lenth<1');
+        return true;
+    } else {
+        console.log('normal logic');
+        return false;
+    }
+}
+
+assert(testDepdMessage() === true, "Deprecated code must be triggered!");
+assert(testDepdMessage('a') === false, "Deprecated code must be triggered!");
+
+interface ITestObject {
+    p1: string;
+    p2: string;
+}
+
+var obj = <ITestObject>{ p1: 'deprecated property', p2: 'normal property' };
+deprecate.property(obj, 'p1', 'property [p1] is deprecated!');
+
+console.log(obj.p1);
+
+interface ITestDeprecatedFunction {
+    func1?: Function;
+    func2?: Function;
+}
+
+var obj2 = <ITestDeprecatedFunction>{};
+
+// message automatically derived from function name 
+obj2.func1 = deprecate.function(function func1() {
+    console.log('all calls to [func1] are deprecated ');
+});
+
+// specific message 
+obj2.func2 = deprecate.function(function () {
+    console.log('all calls to [func2] are deprecated ');
+}, 'func2');
+
+obj2.func1();
+obj2.func2();
\ No newline at end of file
diff --git a/depd/depd.d.ts b/depd/depd.d.ts
new file mode 100644
index 000000000..1af4eaa8d
--- /dev/null
+++ b/depd/depd.d.ts
@@ -0,0 +1,17 @@
+// Type definitions for depd 1.1.0
+// Project: https://github.com/dougwilson/nodejs-depd
+// Definitions by: Zhiyuan Wang <https://github.com/danny8002/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+
+declare module 'depd' {
+    function depd(namespace: string): Deprecate;
+
+    interface Deprecate {
+        (message: string): void;
+        function(fn: Function, message?: string): Function;
+        property(obj: Object, prop: string, message: string): void;
+    }
+
+    export = depd;
+}
\ No newline at end of file
diff --git a/merge-descriptors/merge-descriptors-tests.ts b/merge-descriptors/merge-descriptors-tests.ts
new file mode 100644
index 000000000..81376320f
--- /dev/null
+++ b/merge-descriptors/merge-descriptors-tests.ts
@@ -0,0 +1,35 @@
+/// <reference path="merge-descriptors.d.ts"/>
+import mixin = require('merge-descriptors');
+
+function testAssertion(condition: boolean, errorMessage: string) {
+    if (!condition) {
+        throw new Error(errorMessage);
+    }
+}
+
+interface IMergedObject {
+    InSrc?: string;
+    name: string;
+    InTarget: string;
+}
+
+var src = {
+    InSrc: 'src',
+    get name(): string {
+        return 'from src name';
+    }
+}
+
+var target: IMergedObject = { name: 'my target name', InTarget: 'target' };
+
+var target2 = mixin(target, src, true);
+
+console.log(JSON.stringify(target));
+
+testAssertion(target2 === target, "Returned object should refer to input [destination] object");
+testAssertion(target.name === 'from src name', "[redfine]=true, source member will overwrite destination member");
+testAssertion(target.InTarget === 'target', "overwrite do not affect members only in [destination]");
+testAssertion(target['InSrc'] === 'src', "members from [source] must be copied to [destination]");
+
+var nameProperty:PropertyDescriptor = Object.getOwnPropertyDescriptor(target, "name");
+testAssertion(nameProperty.set === undefined, "member descriptor must be overwritten");
\ No newline at end of file
diff --git a/merge-descriptors/merge-descriptors-tests.ts.tscparams b/merge-descriptors/merge-descriptors-tests.ts.tscparams
new file mode 100644
index 000000000..4169d3605
--- /dev/null
+++ b/merge-descriptors/merge-descriptors-tests.ts.tscparams
@@ -0,0 +1 @@
+--noImplicitAny --module commonjs --target es5
\ No newline at end of file
diff --git a/merge-descriptors/merge-descriptors.d.ts b/merge-descriptors/merge-descriptors.d.ts
new file mode 100644
index 000000000..8e3212edd
--- /dev/null
+++ b/merge-descriptors/merge-descriptors.d.ts
@@ -0,0 +1,13 @@
+// Type definitions for merge-descriptors
+// Project: https://github.com/component/merge-descriptors
+// Definitions by: Zhiyuan Wang <https://github.com/danny8002/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'merge-descriptors' {
+
+    function merge(destination: Object, source: Object): Object;
+
+    function merge(destination: Object, source: Object, redefine: boolean): Object;
+
+    export = merge;
+}
\ No newline at end of file
diff --git a/ms/ms-tests.ts b/ms/ms-tests.ts
new file mode 100644
index 000000000..75312e927
--- /dev/null
+++ b/ms/ms-tests.ts
@@ -0,0 +1,14 @@
+/// <reference path="./ms.d.ts"/>
+
+import ms = require('ms');
+
+ms('2 days')  // 172800000 
+ms('1d')      // 86400000 
+
+ms(60000)             // "1m" 
+ms(2 * 60000)         // "2m" 
+ms(ms('10 hours'))    // "10h" 
+
+ms(60000, { long: true })             // "1 minute" 
+ms(2 * 60000, { long: true })         // "2 minutes" 
+ms(ms('10 hours'), { long: true })    // "10 hours" 
\ No newline at end of file
diff --git a/ms/ms.d.ts b/ms/ms.d.ts
new file mode 100644
index 000000000..fe26e03e3
--- /dev/null
+++ b/ms/ms.d.ts
@@ -0,0 +1,26 @@
+// Type definitions for ms v0.7.1
+// Project: https://github.com/guille/ms.js
+// Definitions by: Zhiyuan Wang <https://github.com/danny8002/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'ms' {
+
+    /**
+    * Short/Long format for `value`.
+    *
+    * @param {Number} value
+    * @param {{long: boolean}} options
+    * @return {String}
+    */
+    function ms(value: number, options?: { long: boolean }): string;
+
+    /**
+    * Parse the given `value` and return milliseconds.
+    *
+    * @param {String} value
+    * @return {Number}
+    */
+    function ms(value: string): number;
+
+    export = ms;
+}
\ No newline at end of file