diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index cc5537b24..f1d5b0504 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -15163,6 +15163,20 @@ declare var ShadowRoot: {
     new(): ShadowRoot;
 };
 
+interface SharedWorker extends EventTarget, AbstractWorker {
+    readonly port: MessagePort;
+    addEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: SharedWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: SharedWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+}
+
+declare var SharedWorker: {
+    prototype: SharedWorker;
+    new(aURL: string, name?: string): SharedWorker;
+    new(aURL: string, options?: WorkerOptions): SharedWorker;
+};
+
 interface Slotable {
     readonly assignedSlot: HTMLSlotElement | null;
 }
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index 111b94ad0..0e47d18fe 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -2990,6 +2990,20 @@ declare var ServiceWorkerRegistration: {
     new(): ServiceWorkerRegistration;
 };
 
+interface SharedWorker extends EventTarget, AbstractWorker {
+    readonly port: MessagePort;
+    addEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: SharedWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: SharedWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+}
+
+declare var SharedWorker: {
+    prototype: SharedWorker;
+    new(aURL: string, name?: string): SharedWorker;
+    new(aURL: string, options?: WorkerOptions): SharedWorker;
+};
+
 interface StorageManager {
     estimate(): Promise<StorageEstimate>;
     persisted(): Promise<boolean>;
diff --git a/inputfiles/addedTypes.json b/inputfiles/addedTypes.json
index a6ce1c001..e9527fc1e 100644
--- a/inputfiles/addedTypes.json
+++ b/inputfiles/addedTypes.json
@@ -2282,6 +2282,64 @@
                         }
                     }
                 }
+            },
+            "SharedWorker": {
+                "name": "SharedWorker",
+                "constructor": {
+                    "specs": "workers",
+                    "signature": [
+                        {
+                            "param-min-required": 1,
+                            "type": "SharedWorker",
+                            "param": [
+                                {
+                                    "name": "aURL",
+                                    "type": "DOMString",
+                                    "type-original": "DOMString"
+                                },
+                                {
+                                    "name": "name",
+                                    "type": "DOMString",
+                                    "type-original": "DOMString",
+                                    "optional": 1
+                                }
+                            ],
+                            "type-original": "SharedWorker"
+                        },
+                        {
+                            "param-min-required": 1,
+                            "type": "SharedWorker",
+                            "param": [
+                                {
+                                    "name": "aURL",
+                                    "type": "DOMString",
+                                    "type-original": "DOMString"
+                                },
+                                {
+                                    "name": "options",
+                                    "type": "WorkerOptions",
+                                    "type-original": "WorkerOptions",
+                                    "optional": 1
+                                }
+                            ],
+                            "type-original": "SharedWorker"
+                        }
+                    ],
+                    "name": ""
+                },
+                "properties": {
+                    "property": {
+                        "port": {
+                            "name": "port",
+                            "read-only": 1,
+                            "override-type": "MessagePort"
+                        }
+                    }
+                },
+                "extends": "EventTarget",
+                "implements": [
+                    "AbstractWorker"
+                ]
             }
         }
     },
@@ -2416,4 +2474,4 @@
             }
         ]
     }
-}
+}
\ No newline at end of file