diff --git a/baselines/audioworklet.generated.d.ts b/baselines/audioworklet.generated.d.ts
index be0c723c6..6eeabb26b 100644
--- a/baselines/audioworklet.generated.d.ts
+++ b/baselines/audioworklet.generated.d.ts
@@ -1411,7 +1411,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 5acd208bd..e98dcb132 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -37678,7 +37678,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/serviceworker.generated.d.ts b/baselines/serviceworker.generated.d.ts
index 90b838669..9c55e8ab6 100644
--- a/baselines/serviceworker.generated.d.ts
+++ b/baselines/serviceworker.generated.d.ts
@@ -9577,7 +9577,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/sharedworker.generated.d.ts b/baselines/sharedworker.generated.d.ts
index dd83d4fdc..8f4733e6a 100644
--- a/baselines/sharedworker.generated.d.ts
+++ b/baselines/sharedworker.generated.d.ts
@@ -9120,7 +9120,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.5/audioworklet.generated.d.ts b/baselines/ts5.5/audioworklet.generated.d.ts
index dbe38b1ad..ab21cf30f 100644
--- a/baselines/ts5.5/audioworklet.generated.d.ts
+++ b/baselines/ts5.5/audioworklet.generated.d.ts
@@ -1408,7 +1408,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.5/dom.generated.d.ts b/baselines/ts5.5/dom.generated.d.ts
index b6e17077b..db855f1f8 100644
--- a/baselines/ts5.5/dom.generated.d.ts
+++ b/baselines/ts5.5/dom.generated.d.ts
@@ -37652,7 +37652,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.5/serviceworker.generated.d.ts b/baselines/ts5.5/serviceworker.generated.d.ts
index 9d420a826..faced286c 100644
--- a/baselines/ts5.5/serviceworker.generated.d.ts
+++ b/baselines/ts5.5/serviceworker.generated.d.ts
@@ -9574,7 +9574,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.5/sharedworker.generated.d.ts b/baselines/ts5.5/sharedworker.generated.d.ts
index 72b0b45ae..5b4bd5614 100644
--- a/baselines/ts5.5/sharedworker.generated.d.ts
+++ b/baselines/ts5.5/sharedworker.generated.d.ts
@@ -9117,7 +9117,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.5/webworker.generated.d.ts b/baselines/ts5.5/webworker.generated.d.ts
index 092fb7a1b..f8fbdafe5 100644
--- a/baselines/ts5.5/webworker.generated.d.ts
+++ b/baselines/ts5.5/webworker.generated.d.ts
@@ -10744,7 +10744,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.6/audioworklet.generated.d.ts b/baselines/ts5.6/audioworklet.generated.d.ts
index dbe38b1ad..ab21cf30f 100644
--- a/baselines/ts5.6/audioworklet.generated.d.ts
+++ b/baselines/ts5.6/audioworklet.generated.d.ts
@@ -1408,7 +1408,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.6/dom.generated.d.ts b/baselines/ts5.6/dom.generated.d.ts
index 7b212470f..a93eb78c8 100644
--- a/baselines/ts5.6/dom.generated.d.ts
+++ b/baselines/ts5.6/dom.generated.d.ts
@@ -37675,7 +37675,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.6/serviceworker.generated.d.ts b/baselines/ts5.6/serviceworker.generated.d.ts
index 9d420a826..faced286c 100644
--- a/baselines/ts5.6/serviceworker.generated.d.ts
+++ b/baselines/ts5.6/serviceworker.generated.d.ts
@@ -9574,7 +9574,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.6/sharedworker.generated.d.ts b/baselines/ts5.6/sharedworker.generated.d.ts
index 72b0b45ae..5b4bd5614 100644
--- a/baselines/ts5.6/sharedworker.generated.d.ts
+++ b/baselines/ts5.6/sharedworker.generated.d.ts
@@ -9117,7 +9117,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.6/webworker.generated.d.ts b/baselines/ts5.6/webworker.generated.d.ts
index 092fb7a1b..f8fbdafe5 100644
--- a/baselines/ts5.6/webworker.generated.d.ts
+++ b/baselines/ts5.6/webworker.generated.d.ts
@@ -10744,7 +10744,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.9/audioworklet.generated.d.ts b/baselines/ts5.9/audioworklet.generated.d.ts
index af701138c..3e1e173c0 100644
--- a/baselines/ts5.9/audioworklet.generated.d.ts
+++ b/baselines/ts5.9/audioworklet.generated.d.ts
@@ -1408,7 +1408,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.9/dom.generated.d.ts b/baselines/ts5.9/dom.generated.d.ts
index b7c94593a..59a799073 100644
--- a/baselines/ts5.9/dom.generated.d.ts
+++ b/baselines/ts5.9/dom.generated.d.ts
@@ -37675,7 +37675,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.9/serviceworker.generated.d.ts b/baselines/ts5.9/serviceworker.generated.d.ts
index 3785996a6..ba53c9337 100644
--- a/baselines/ts5.9/serviceworker.generated.d.ts
+++ b/baselines/ts5.9/serviceworker.generated.d.ts
@@ -9574,7 +9574,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.9/sharedworker.generated.d.ts b/baselines/ts5.9/sharedworker.generated.d.ts
index a447ef65a..a54b1166f 100644
--- a/baselines/ts5.9/sharedworker.generated.d.ts
+++ b/baselines/ts5.9/sharedworker.generated.d.ts
@@ -9117,7 +9117,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/ts5.9/webworker.generated.d.ts b/baselines/ts5.9/webworker.generated.d.ts
index 308626981..3af80e15b 100644
--- a/baselines/ts5.9/webworker.generated.d.ts
+++ b/baselines/ts5.9/webworker.generated.d.ts
@@ -10744,7 +10744,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index 293996edb..99aaf944e 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -10747,7 +10747,7 @@ interface URLSearchParams {
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
+    new(init?: string | Iterable<[string, string]> | Record<string, string>): URLSearchParams;
 };
 
 /**
diff --git a/inputfiles/overridingTypes.jsonc b/inputfiles/overridingTypes.jsonc
index 7e53cf2e5..2bcb7e55f 100644
--- a/inputfiles/overridingTypes.jsonc
+++ b/inputfiles/overridingTypes.jsonc
@@ -2857,6 +2857,21 @@
             "TrustedTypePolicyFactory": {
                 "exposed": ""
             },
+            "URLSearchParams": {
+                "name": "URLSearchParams",
+                "constructor": {
+                    "signature": {
+                        "0": {
+                            "param": [
+                                {
+                                    "name": "init",
+                                    "overrideType": "string | Iterable<[string, string]> | Record<string, string>"
+                                }
+                            ]
+                        }
+                    }
+                }
+            }
         }
     },
     "dictionaries": {