diff --git a/watchpack/DirectoryWatcher.d.ts b/watchpack/DirectoryWatcher.d.ts
new file mode 100644
index 0000000000..0fac7ebeff
--- /dev/null
+++ b/watchpack/DirectoryWatcher.d.ts
@@ -0,0 +1,59 @@
+/// <reference types="node" />
+/// <reference types="chokidar" />
+import { EventEmitter } from 'events';
+import fs = require('graceful-fs');
+import Watcher = require('./Watcher');
+import Watchpack = require('watchpack');
+
+declare class DirectoryWatcher extends EventEmitter {
+    options: Watchpack.WatcherOptions;
+    directories: {
+        [path: string]: Watcher | true;
+    };
+    files: {
+        [path: string]: [number, number];
+    };
+    initialScan: boolean;
+    initialScanRemoved: string[];
+    nestedWatching: boolean;
+    path: string;
+    refs: number;
+    watcher: fs.FSWatcher;
+    watchers: {
+        [path: string]: Watcher[];
+    };
+
+    constructor(directoryPath: string, options: Watchpack.WatcherOptions);
+
+    setFileTime(filePath: string, mtime: number, initial: boolean, type?: string | boolean): void;
+
+    setDirectory(directoryPath: string, exist: boolean, initial: boolean): void;
+
+    createNestedWatcher(directoryPath: string): void;
+
+    setNestedWatching(flag: boolean): void;
+
+    watch(filePath: string, startTime: number): Watcher;
+
+    onFileAdded(filePath: string, stat: fs.Stats): void;
+
+    onDirectoryAdded(directoryPath: string): void;
+
+    onChange(filePath: string, stat: fs.Stats): void;
+
+    onFileUnlinked(filePath: string): void;
+
+    onDirectoryUnlinked(directoryPath: string): void;
+
+    onWatcherError(): void;
+
+    doInitialScan(): void;
+
+    getTimes(): {
+        [path: string]: number;
+    };
+
+    close(): void;
+}
+
+export = DirectoryWatcher;
diff --git a/watchpack/Watcher.d.ts b/watchpack/Watcher.d.ts
new file mode 100644
index 0000000000..041b693da8
--- /dev/null
+++ b/watchpack/Watcher.d.ts
@@ -0,0 +1,18 @@
+/// <reference types="node" />
+import { EventEmitter } from 'events';
+import DirectoryWatcher = require('./DirectoryWatcher');
+
+declare class Watcher extends EventEmitter {
+    data: number;
+    directoryWatcher: DirectoryWatcher;
+    path: string;
+    startTime: number;
+
+    constructor(directoryWatcher: DirectoryWatcher, filePath: string, startTime: number);
+
+    checkStartTime(mtime: number, initial: boolean): boolean;
+
+    close(): void;
+}
+
+export = Watcher;
diff --git a/watchpack/index.d.ts b/watchpack/index.d.ts
new file mode 100644
index 0000000000..9a987be3da
--- /dev/null
+++ b/watchpack/index.d.ts
@@ -0,0 +1,54 @@
+// Type definitions for watchpack 1.1
+// Project: https://github.com/webpack/watchpack
+// Definitions by: e-cloud <https://github.com/e-cloud>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+import { EventEmitter } from 'events';
+import Watcher = require('./Watcher');
+
+declare class Watchpack extends EventEmitter {
+    aggregatedChanges: string[];
+    aggregateTimeout: NodeJS.Timer;
+    dirWatchers: Watcher[];
+    fileWatchers: Watcher[];
+    mtimes: {
+        [path: string]: number;
+    };
+    options: Watchpack.WatchOptions;
+    paused: boolean;
+    watcherOptions: Watchpack.WatcherOptions;
+
+    constructor(options: Watchpack.WatchOptions);
+
+    watch(files: string[], directories: string[], startTime: number): void;
+
+    close(): void;
+
+    pause(): void;
+
+    getTimes(): {
+        [path: string]: number;
+    };
+
+    _fileWatcher(file: string, watcher: Watcher): Watcher;
+
+    _dirWatcher(item: string, watcher: Watcher): Watcher;
+
+    _onChange(item: string, mtime: number, file?: string): void;
+
+    _onTimeout(): void;
+}
+
+declare namespace Watchpack {
+    interface WatcherOptions {
+        ignored?: string[] | string | RegExp | ((path: string) => boolean);
+        poll?: boolean | number;
+    }
+    interface WatchOptions extends WatcherOptions {
+        aggregateTimeout?: number;
+    }
+}
+
+export = Watchpack;
diff --git a/watchpack/tsconfig.json b/watchpack/tsconfig.json
new file mode 100644
index 0000000000..d492948f55
--- /dev/null
+++ b/watchpack/tsconfig.json
@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es6",
+    "noImplicitAny": true,
+    "strictNullChecks": true,
+    "baseUrl": "../",
+    "typeRoots": [
+      "../"
+    ],
+    "types": [],
+    "noEmit": true,
+    "forceConsistentCasingInFileNames": true
+  },
+  "files": [
+    "index.d.ts",
+    "DirectoryWatcher.d.ts",
+    "Watcher.d.ts",
+    "watchpack-tests.ts"
+  ]
+}
diff --git a/watchpack/tslint.json b/watchpack/tslint.json
new file mode 100644
index 0000000000..377cc837d4
--- /dev/null
+++ b/watchpack/tslint.json
@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }
diff --git a/watchpack/watchpack-tests.ts b/watchpack/watchpack-tests.ts
new file mode 100644
index 0000000000..77b78d8c23
--- /dev/null
+++ b/watchpack/watchpack-tests.ts
@@ -0,0 +1,7 @@
+import Watchpack = require('watchpack');
+const watch = new Watchpack({});
+
+watch.watch(['test.js'], ['lib/'], 1000);
+
+let time: number
+time = watch.getTimes()['test.js']