diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 95fad6275..8d599758a 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -13232,6 +13232,7 @@ interface Window extends EventTarget, WindowTimers, WindowSessionStorage, Window
     readonly top: Window;
     readonly window: Window;
     URL: typeof URL;
+    URLSearchParams: typeof URLSearchParams;
     Blob: typeof Blob;
     customElements: CustomElementRegistry;
     alert(message?: any): void;
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index fb9358fc0..0034d0a63 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -61,6 +61,10 @@ interface NotificationOptions {
     icon?: string;
 }
 
+interface ObjectURLOptions {
+    oneTimeOnly?: boolean;
+}
+
 interface PushSubscriptionOptionsInit {
     userVisibleOnly?: boolean;
     applicationServerKey?: any;
@@ -1008,6 +1012,29 @@ declare var SyncManager: {
     new(): SyncManager;
 }
 
+interface URL {
+    hash: string;
+    host: string;
+    hostname: string;
+    href: string;
+    readonly origin: string;
+    password: string;
+    pathname: string;
+    port: string;
+    protocol: string;
+    search: string;
+    username: string;
+    readonly searchParams: URLSearchParams;
+    toString(): string;
+}
+
+declare var URL: {
+    prototype: URL;
+    new(url: string, base?: string): URL;
+    createObjectURL(object: any, options?: ObjectURLOptions): string;
+    revokeObjectURL(url: string): void;
+}
+
 interface WebSocketEventMap {
     "close": CloseEvent;
     "error": Event;
@@ -1484,6 +1511,41 @@ interface ImageBitmap {
     close(): void;
 }
 
+interface URLSearchParams {
+    /**
+      * Appends a specified key/value pair as a new search parameter.
+      */
+    append(name: string, value: string): void;
+    /**
+      * Deletes the given search parameter, and its associated value, from the list of all search parameters.
+      */
+    delete(name: string): void;
+    /**
+      * Returns the first value associated to the given search parameter.
+      */
+    get(name: string): string | null;
+    /**
+      * Returns all the values association with a given search parameter.
+      */
+    getAll(name: string): string[];
+    /**
+      * Returns a Boolean indicating if such a search parameter exists.
+      */
+    has(name: string): boolean;
+    /**
+      * Sets the value associated to a given search parameter to the given value. If there were several values, delete the others.
+      */
+    set(name: string, value: string): void;
+}
+
+declare var URLSearchParams: {
+    prototype: URLSearchParams;
+    /**
+      * Constructor returning a URLSearchParams object.
+      */
+    new (init?: string | URLSearchParams): URLSearchParams;
+}
+
 interface BlobPropertyBag {
     type?: string;
     endings?: string;
diff --git a/inputfiles/addedTypes.json b/inputfiles/addedTypes.json
index 61209eebc..293035718 100644
--- a/inputfiles/addedTypes.json
+++ b/inputfiles/addedTypes.json
@@ -181,7 +181,6 @@
     {
         "kind": "interface",
         "name": "URLSearchParams",
-        "flavor": "Web",
         "constructorSignatures": [
             "new (init?: string | URLSearchParams): URLSearchParams"
         ],
@@ -226,6 +225,13 @@
         "name": "URL",
         "type": "typeof URL"
     },
+    {
+        "kind": "property",
+        "interface": "Window",
+        "exposeGlobally": false,
+        "name": "URLSearchParams",
+        "type": "typeof URLSearchParams"
+    },
     {
         "kind": "property",
         "interface": "Window",
diff --git a/inputfiles/knownWorkerInterfaces.json b/inputfiles/knownWorkerInterfaces.json
index a56aea3ed..7e35f48e6 100644
--- a/inputfiles/knownWorkerInterfaces.json
+++ b/inputfiles/knownWorkerInterfaces.json
@@ -66,6 +66,7 @@
     "NotificationEventInit",
     "NotificationOptions",
     "NotificationPermissionCallback",
+    "ObjectURLOptions",
     "Performance",
     "PerformanceNavigation",
     "PerformanceTiming",
@@ -91,6 +92,8 @@
     "SyncEventInit",
     "SyncManager",
     "USVString",
+    "URL",
+    "URLSearchParams",
     "WebSocket",
     "WindowBase64",
     "WindowConsole",
@@ -98,4 +101,4 @@
     "XMLHttpRequest",
     "XMLHttpRequestEventTarget",
     "XMLHttpRequestUpload"
-]
\ No newline at end of file
+]