diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 3b106de41..8098645ba 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -3320,7 +3320,7 @@ interface ErrorEvent extends Event {
 
 declare var ErrorEvent: {
     prototype: ErrorEvent;
-    new(): ErrorEvent;
+    new(type: string, errorEventInitDict?: ErrorEventInit): ErrorEvent;
 }
 
 interface Event {
@@ -12708,6 +12708,14 @@ interface XMLHttpRequestEventTarget {
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): void;
 }
 
+interface ErrorEventInit {
+    message?: string;
+    filename?: string;
+    lineno?: number;
+    conlno?: number;
+    error?: any;
+}
+
 interface StorageEventInit extends EventInit {
     key?: string;
     oldValue?: string;
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index a787d4b25..00059d4c2 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -227,7 +227,7 @@ interface ErrorEvent extends Event {
 
 declare var ErrorEvent: {
     prototype: ErrorEvent;
-    new(): ErrorEvent;
+    new(type: string, errorEventInitDict?: ErrorEventInit): ErrorEvent;
 }
 
 interface Event {
@@ -985,6 +985,14 @@ interface WorkerUtils extends Object, WindowBase64 {
     setTimeout(handler: any, timeout?: any, ...args: any[]): number;
 }
 
+interface ErrorEventInit {
+    message?: string;
+    filename?: string;
+    lineno?: number;
+    conlno?: number;
+    error?: any;
+}
+
 interface BlobPropertyBag {
     type?: string;
     endings?: string;
diff --git a/inputfiles/addedTypes.json b/inputfiles/addedTypes.json
index 425f10f29..43ce2a148 100644
--- a/inputfiles/addedTypes.json
+++ b/inputfiles/addedTypes.json
@@ -1,4 +1,30 @@
 [
+    {
+        "kind": "interface",
+        "name": "ErrorEventInit",
+        "properties": [
+            {
+                "name": "message?",
+                "type": "string"
+            },
+            {
+                "name": "filename?",
+                "type": "string"
+            },
+            {
+                "name": "lineno?",
+                "type": "number"
+            },
+            {
+                "name": "conlno?",
+                "type": "number"
+            },
+            {
+                "name": "error?",
+                "type": "any"
+            }
+        ]
+    },
     {
         "kind": "property",
         "interface": "CSSStyleDeclaration",
diff --git a/inputfiles/overridingTypes.json b/inputfiles/overridingTypes.json
index b9b40d469..35894c17a 100644
--- a/inputfiles/overridingTypes.json
+++ b/inputfiles/overridingTypes.json
@@ -1,4 +1,9 @@
  [
+    {
+        "kind": "constructor",
+        "interface": "ErrorEvent",
+        "signatures": ["new(type: string, errorEventInitDict?: ErrorEventInit): ErrorEvent"]
+    },
     {
         "kind": "property",
         "interface": "Window",