From b0e5c13a0cce40501a7d0fcbd822d6fa0cf87e10 Mon Sep 17 00:00:00 2001
From: Bashamega <adambashaahmednaji@gmail.com>
Date: Sun, 21 Dec 2025 07:11:14 +0200
Subject: [PATCH 1/2] Support constructor

---
 inputfiles/addedTypes.jsonc | 15 ---------------
 inputfiles/patches/url.kdl  |  7 +++++++
 src/build/patches.ts        | 21 +++++++++++++++++----
 3 files changed, 24 insertions(+), 19 deletions(-)
 create mode 100644 inputfiles/patches/url.kdl

diff --git a/inputfiles/addedTypes.jsonc b/inputfiles/addedTypes.jsonc
index 4e83a117f..b258c6c08 100644
--- a/inputfiles/addedTypes.jsonc
+++ b/inputfiles/addedTypes.jsonc
@@ -96,21 +96,6 @@
                     ]
                 }
             },
-            "URLSearchParams": {
-                "name": "URLSearchParams",
-                "constructor": {
-                    "signature": {
-                        "0": {
-                            "param": [
-                                {
-                                    "name": "init",
-                                    "additionalTypes": ["URLSearchParams"]
-                                }
-                            ]
-                        }
-                    }
-                }
-            },
             "NodeListOf": {
                 "name": "NodeListOf",
                 "typeParameters": [
diff --git a/inputfiles/patches/url.kdl b/inputfiles/patches/url.kdl
new file mode 100644
index 000000000..b4fbeb195
--- /dev/null
+++ b/inputfiles/patches/url.kdl
@@ -0,0 +1,7 @@
+interface URLSearchParams {
+    constructor signatureIndex=0 {
+        param init {
+            additionalTypes URLSearchParams
+        }
+    }
+}
diff --git a/src/build/patches.ts b/src/build/patches.ts
index 26368e585..ac9ebede5 100644
--- a/src/build/patches.ts
+++ b/src/build/patches.ts
@@ -168,6 +168,7 @@ function handleMixinAndInterfaces(
   const event: Event[] = [];
   const property: Record<string, DeepPartial<Property>> = {};
   let method: Record<string, DeepPartial<OverridableMethod>> = {};
+  let constructor: DeepPartial<OverridableMethod> | undefined;
   let typeParameters = {};
 
   for (const child of node.children) {
@@ -182,12 +183,19 @@ function handleMixinAndInterfaces(
       }
       case "method": {
         const methodName = string(child.values[0]);
-        const m = handleMethod(child);
+        const m = handleMethodAndConstructor(child);
         method = merge(method, {
           [methodName]: m,
         });
         break;
       }
+      case "constructor": {
+        if (constructor) {
+          throw new Error(`Multiple constructors found in ${type} "${name}"`);
+        }
+        constructor = handleMethodAndConstructor(child, true);
+        break;
+      }
       case "typeParameters": {
         typeParameters = handleTypeParameters(child);
         break;
@@ -199,6 +207,7 @@ function handleMixinAndInterfaces(
 
   const interfaceObject = type === "interface" && {
     ...typeParameters,
+    ...(constructor ? { constructor } : {}),
     ...optionalMember("exposed", "string", node.properties?.exposed),
     ...optionalMember("deprecated", "string", node.properties?.deprecated),
     ...optionalMember(
@@ -294,11 +303,15 @@ function handleParam(node: Node) {
 }
 
 /**
- * Handles a child node of type "method" and adds it to the method object.
+ * Handles a child node of type "method" or "constructor" and adds it to the method or constructor object.
  * @param child The child node to handle.
+ * @param isConstructor Whether the child node is a constructor.
  */
-function handleMethod(child: Node): DeepPartial<OverridableMethod> {
-  const name = string(child.values[0]);
+function handleMethodAndConstructor(
+  child: Node,
+  isConstructor: boolean = false,
+): DeepPartial<OverridableMethod> {
+  const name = isConstructor ? undefined : string(child.values[0]);
 
   let typeNode: Node | undefined;
   const params: Partial<Param>[] = [];

From 25a4b77c95e07bde88be78ccf9fed49aecb8fbdb Mon Sep 17 00:00:00 2001
From: Bashamega <adambashaahmednaji@gmail.com>
Date: Mon, 22 Dec 2025 12:11:40 +0200
Subject: [PATCH 2/2] Support multiple

---
 src/build/patches.ts | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/build/patches.ts b/src/build/patches.ts
index ac9ebede5..75bb59c83 100644
--- a/src/build/patches.ts
+++ b/src/build/patches.ts
@@ -190,10 +190,8 @@ function handleMixinAndInterfaces(
         break;
       }
       case "constructor": {
-        if (constructor) {
-          throw new Error(`Multiple constructors found in ${type} "${name}"`);
-        }
-        constructor = handleMethodAndConstructor(child, true);
+        const c = handleMethodAndConstructor(child, true);
+        constructor = merge(constructor, c);
         break;
       }
       case "typeParameters": {