diff --git a/package.json b/package.json
index 166b73b4a9c23..9ec67593c9063 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
     "name": "typescript",
     "author": "Microsoft Corp.",
     "homepage": "http://typescriptlang.org/",
-    "version": "1.6.0",
+    "version": "1.7.0",
     "license": "Apache-2.0",
     "description": "TypeScript is a language for application scale JavaScript development",
     "keywords": [
diff --git a/src/lib/dom.generated.d.ts b/src/lib/dom.generated.d.ts
index 9f857276d1a62..09ab70f23b334 100644
--- a/src/lib/dom.generated.d.ts
+++ b/src/lib/dom.generated.d.ts
@@ -7706,7 +7706,7 @@ interface MessageEvent extends Event {
 
 declare var MessageEvent: {
     prototype: MessageEvent;
-    new(): MessageEvent;
+    new(type: string, eventInitDict?: MessageEventInit): MessageEvent;
 }
 
 interface MessagePort extends EventTarget {
@@ -8448,7 +8448,7 @@ interface ProgressEvent extends Event {
 
 declare var ProgressEvent: {
     prototype: ProgressEvent;
-    new(): ProgressEvent;
+    new(type: string, eventInitDict?: ProgressEventInit): ProgressEvent;
 }
 
 interface Range {
@@ -12615,7 +12615,6 @@ interface NodeListOf<TNode extends Node> extends NodeList {
     [index: number]: TNode;
 }
 
-
 interface BlobPropertyBag {
     type?: string;
     endings?: string;
@@ -12632,6 +12631,21 @@ interface EventListenerObject {
 
 declare type EventListenerOrEventListenerObject = EventListener | EventListenerObject;
 
+interface MessageEventInit extends EventInit {
+    data?: any;
+    origin?: string;
+    lastEventId?: string;
+    channel?: string;
+    source?: any;
+    ports?: Array<MessagePort>;
+}
+
+interface ProgressEventInit extends EventInit {
+    lengthComputable?: boolean;
+    loaded?: number;
+    total?: number;
+}
+
 interface ErrorEventHandler {
     (message: string, filename?: string, lineno?: number, colno?: number, error?:Error): void;
 }
diff --git a/src/lib/webworker.generated.d.ts b/src/lib/webworker.generated.d.ts
index eef668d7745a6..eff2035c627a1 100644
--- a/src/lib/webworker.generated.d.ts
+++ b/src/lib/webworker.generated.d.ts
@@ -587,7 +587,7 @@ interface MessageEvent extends Event {
 
 declare var MessageEvent: {
     prototype: MessageEvent;
-    new(): MessageEvent;
+    new(type: string, eventInitDict?: MessageEventInit): MessageEvent;
 }
 
 interface MessagePort extends EventTarget {
@@ -640,7 +640,7 @@ interface ProgressEvent extends Event {
 
 declare var ProgressEvent: {
     prototype: ProgressEvent;
-    new(): ProgressEvent;
+    new(type: string, eventInitDict?: ProgressEventInit): ProgressEvent;
 }
 
 interface WebSocket extends EventTarget {
@@ -911,6 +911,21 @@ interface EventListenerObject {
 
 declare type EventListenerOrEventListenerObject = EventListener | EventListenerObject;
 
+interface MessageEventInit extends EventInit {
+    data?: any;
+    origin?: string;
+    lastEventId?: string;
+    channel?: string;
+    source?: any;
+    ports?: Array<MessagePort>;
+}
+
+interface ProgressEventInit extends EventInit {
+    lengthComputable?: boolean;
+    loaded?: number;
+    total?: number;
+}
+
 interface ErrorEventHandler {
     (message: string, filename?: string, lineno?: number, colno?: number, error?:Error): void;
 }