diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 6af3fa54d..6c29a47d8 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -770,6 +770,7 @@ interface RegistrationOptions {
 }
 
 interface RequestInit {
+    signal?: AbortSignal;
     body?: any;
     cache?: RequestCache;
     credentials?: RequestCredentials;
@@ -9233,6 +9234,7 @@ interface Request extends Object, Body {
     readonly referrerPolicy: ReferrerPolicy;
     readonly type: RequestType;
     readonly url: string;
+    readonly signal: AbortSignal;
     clone(): Request;
 }
 
@@ -14785,6 +14787,21 @@ interface WEBGL_lose_context {
     restoreContext(): void;
 }
 
+interface AbortController {
+    readonly signal: AbortSignal;
+    abort(): void;
+}
+
+declare var AbortController: {
+    prototype: AbortController;
+    new(): AbortController;
+};
+
+interface AbortSignal extends EventTarget {
+    readonly aborted: boolean;
+    onabort: (ev: Event) => any;
+}
+
 declare type EventListenerOrEventListenerObject = EventListener | EventListenerObject;
 
 interface DecodeErrorCallback {
@@ -15365,4 +15382,4 @@ type ServiceWorkerState = "installing" | "installed" | "activating" | "activated
 type Transport = "usb" | "nfc" | "ble";
 type VideoFacingModeEnum = "user" | "environment" | "left" | "right";
 type VisibilityState = "hidden" | "visible" | "prerender" | "unloaded";
-type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
\ No newline at end of file
+type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index d3e2a5764..eabfd70b0 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -71,6 +71,7 @@ interface PushSubscriptionOptionsInit {
 }
 
 interface RequestInit {
+    signal?: AbortSignal;
     body?: any;
     cache?: RequestCache;
     credentials?: RequestCredentials;
@@ -960,6 +961,7 @@ interface Request extends Object, Body {
     readonly referrerPolicy: ReferrerPolicy;
     readonly type: RequestType;
     readonly url: string;
+    readonly signal: AbortSignal;
     clone(): Request;
 }
 
@@ -1822,6 +1824,21 @@ interface AddEventListenerOptions extends EventListenerOptions {
     once?: boolean;
 }
 
+interface AbortController {
+    readonly signal: AbortSignal;
+    abort(): void;
+}
+
+declare var AbortController: {
+    prototype: AbortController;
+    new(): AbortController;
+};
+
+interface AbortSignal extends EventTarget {
+    readonly aborted: boolean;
+    onabort: (ev: Event) => any;
+}
+
 declare type EventListenerOrEventListenerObject = EventListener | EventListenerObject;
 
 interface DecodeErrorCallback {
@@ -1912,4 +1929,4 @@ type ServiceWorkerState = "installing" | "installed" | "activating" | "activated
 type VisibilityState = "hidden" | "visible" | "prerender" | "unloaded";
 type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
 type ClientType = "window" | "worker" | "sharedworker" | "all";
-type FrameType = "auxiliary" | "top-level" | "nested" | "none";
\ No newline at end of file
+type FrameType = "auxiliary" | "top-level" | "nested" | "none";
diff --git a/inputfiles/addedTypes.json b/inputfiles/addedTypes.json
index 32816fc56..3b77ec155 100644
--- a/inputfiles/addedTypes.json
+++ b/inputfiles/addedTypes.json
@@ -2488,5 +2488,56 @@
         "readonly": true,
         "name": "lastModified",
         "type": "number"
+    },
+    {
+        "kind": "interface",
+        "name": "AbortController",
+        "constructorSignatures": [
+            "new(): AbortController"
+        ],
+        "properties": [
+            {
+                "readonly": true,
+                "name": "signal",
+                "type": "AbortSignal"
+            }
+	],
+        "methods": [
+            {
+                "name": "abort",
+                "signatures": [
+                    "abort(): void"
+                ]
+            }
+        ]
+    },
+    {
+        "kind": "interface",
+        "name": "AbortSignal",
+        "extends": "EventTarget",
+        "properties": [
+            {
+                "readonly": true,
+                "name": "aborted",
+                "type": "boolean"
+            },
+            {
+                "name": "onabort",
+                "type": "(ev: Event) => any"
+            }
+        ]
+    },
+    {
+        "kind": "property",
+        "interface": "Request",
+        "readonly": true,
+        "name": "signal",
+        "type": "AbortSignal"
+    },
+    {
+        "kind": "property",
+        "interface": "RequestInit",
+        "name": "signal?",
+        "type": "AbortSignal"
     }
-]
\ No newline at end of file
+]