diff --git a/baselines/sharedworker.generated.d.ts b/baselines/sharedworker.generated.d.ts
index 0808bb7fc..8f2bc3626 100644
--- a/baselines/sharedworker.generated.d.ts
+++ b/baselines/sharedworker.generated.d.ts
@@ -4777,7 +4777,7 @@ interface SharedWorkerGlobalScope extends WorkerGlobalScope {
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/SharedWorkerGlobalScope/close)
      */
-    close(): void;
+    close(): never;
     addEventListener<K extends keyof SharedWorkerGlobalScopeEventMap>(type: K, listener: (this: SharedWorkerGlobalScope, ev: SharedWorkerGlobalScopeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof SharedWorkerGlobalScopeEventMap>(type: K, listener: (this: SharedWorkerGlobalScope, ev: SharedWorkerGlobalScopeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -8463,7 +8463,7 @@ declare var onconnect: ((this: SharedWorkerGlobalScope, ev: MessageEvent) => any
  *
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/SharedWorkerGlobalScope/close)
  */
-declare function close(): void;
+declare function close(): never;
 /**
  * Dispatches a synthetic event event to target and returns true if either event's cancelable attribute value is false or its preventDefault() method was not invoked, and false otherwise.
  *
diff --git a/baselines/ts5.5/sharedworker.generated.d.ts b/baselines/ts5.5/sharedworker.generated.d.ts
index 0808bb7fc..8f2bc3626 100644
--- a/baselines/ts5.5/sharedworker.generated.d.ts
+++ b/baselines/ts5.5/sharedworker.generated.d.ts
@@ -4777,7 +4777,7 @@ interface SharedWorkerGlobalScope extends WorkerGlobalScope {
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/SharedWorkerGlobalScope/close)
      */
-    close(): void;
+    close(): never;
     addEventListener<K extends keyof SharedWorkerGlobalScopeEventMap>(type: K, listener: (this: SharedWorkerGlobalScope, ev: SharedWorkerGlobalScopeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof SharedWorkerGlobalScopeEventMap>(type: K, listener: (this: SharedWorkerGlobalScope, ev: SharedWorkerGlobalScopeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -8463,7 +8463,7 @@ declare var onconnect: ((this: SharedWorkerGlobalScope, ev: MessageEvent) => any
  *
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/SharedWorkerGlobalScope/close)
  */
-declare function close(): void;
+declare function close(): never;
 /**
  * Dispatches a synthetic event event to target and returns true if either event's cancelable attribute value is false or its preventDefault() method was not invoked, and false otherwise.
  *
diff --git a/baselines/ts5.5/webworker.generated.d.ts b/baselines/ts5.5/webworker.generated.d.ts
index fb0790230..a6679f639 100644
--- a/baselines/ts5.5/webworker.generated.d.ts
+++ b/baselines/ts5.5/webworker.generated.d.ts
@@ -2469,7 +2469,7 @@ interface DedicatedWorkerGlobalScope extends WorkerGlobalScope, AnimationFramePr
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/close)
      */
-    close(): void;
+    close(): never;
     /**
      * Clones message and transmits it to the Worker object associated with dedicatedWorkerGlobal. transfer can be passed as a list of objects that are to be transferred rather than cloned.
      *
@@ -5557,7 +5557,7 @@ interface SharedWorkerGlobalScope extends WorkerGlobalScope {
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/SharedWorkerGlobalScope/close)
      */
-    close(): void;
+    close(): never;
     addEventListener<K extends keyof SharedWorkerGlobalScopeEventMap>(type: K, listener: (this: SharedWorkerGlobalScope, ev: SharedWorkerGlobalScopeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof SharedWorkerGlobalScopeEventMap>(type: K, listener: (this: SharedWorkerGlobalScope, ev: SharedWorkerGlobalScopeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -9427,7 +9427,7 @@ declare var onrtctransform: ((this: DedicatedWorkerGlobalScope, ev: RTCTransform
  *
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/close)
  */
-declare function close(): void;
+declare function close(): never;
 /**
  * Clones message and transmits it to the Worker object associated with dedicatedWorkerGlobal. transfer can be passed as a list of objects that are to be transferred rather than cloned.
  *
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index fb0790230..a6679f639 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -2469,7 +2469,7 @@ interface DedicatedWorkerGlobalScope extends WorkerGlobalScope, AnimationFramePr
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/close)
      */
-    close(): void;
+    close(): never;
     /**
      * Clones message and transmits it to the Worker object associated with dedicatedWorkerGlobal. transfer can be passed as a list of objects that are to be transferred rather than cloned.
      *
@@ -5557,7 +5557,7 @@ interface SharedWorkerGlobalScope extends WorkerGlobalScope {
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/SharedWorkerGlobalScope/close)
      */
-    close(): void;
+    close(): never;
     addEventListener<K extends keyof SharedWorkerGlobalScopeEventMap>(type: K, listener: (this: SharedWorkerGlobalScope, ev: SharedWorkerGlobalScopeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof SharedWorkerGlobalScopeEventMap>(type: K, listener: (this: SharedWorkerGlobalScope, ev: SharedWorkerGlobalScopeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -9427,7 +9427,7 @@ declare var onrtctransform: ((this: DedicatedWorkerGlobalScope, ev: RTCTransform
  *
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/DedicatedWorkerGlobalScope/close)
  */
-declare function close(): void;
+declare function close(): never;
 /**
  * Clones message and transmits it to the Worker object associated with dedicatedWorkerGlobal. transfer can be passed as a list of objects that are to be transferred rather than cloned.
  *
diff --git a/inputfiles/overridingTypes.jsonc b/inputfiles/overridingTypes.jsonc
index d2bf25e86..fa719bb3f 100644
--- a/inputfiles/overridingTypes.jsonc
+++ b/inputfiles/overridingTypes.jsonc
@@ -2515,6 +2515,13 @@
             "DedicatedWorkerGlobalScope": {
                 "methods": {
                     "method": {
+                        "close": {
+                            "signature": {
+                                "0": {
+                                    "overrideType": "never"
+                                }
+                            }
+                        },
                         "postMessage": {
                             "signature": {
                                 "0": {
@@ -2542,6 +2549,19 @@
                     ]
                 }
             },
+            "SharedWorkerGlobalScope": {
+                "methods": {
+                    "method": {
+                        "close": {
+                            "signature": {
+                                "0": {
+                                    "overrideType": "never"
+                                }
+                            }
+                        }
+                    }
+                }
+            },
             "HTMLFormElement": {
                 "overrideIndexSignatures": [
                     "[index: number]: Element",