Support KDL constructor (#2305)

Co-authored-by: saschanaz <saschanaz@users.noreply.github.com>

Author: Bashamega

inputfiles/addedTypes.jsonc

@@ -96,21 +96,6 @@
                     ]
                 }
             },
-            "URLSearchParams": {
-                "name": "URLSearchParams",
-                "constructor": {
-                    "signature": {
-                        "0": {
-                            "param": [
-                                {
-                                    "name": "init",
-                                    "additionalTypes": ["URLSearchParams"]
-                                }
-                            ]
-                        }
-                    }
-                }
-            },
             "NodeListOf": {
                 "name": "NodeListOf",
                 "typeParameters": [

inputfiles/patches/url.kdl

@@ -0,0 +1,7 @@
+interface URLSearchParams {
+    constructor signatureIndex=0 {
+        param init {
+            additionalTypes URLSearchParams
+        }
+    }
+}

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 +183,17 @@ 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": {
+        const c = handleMethodAndConstructor(child, true);
+        constructor = merge(constructor, c);
+        break;
+      }
       case "typeParameters": {
         typeParameters = handleTypeParameters(child);
         break;
@@ -199,6 +205,7 @@ function handleMixinAndInterfaces(
 
   const interfaceObject = type === "interface" && {
     ...typeParameters,
+    ...(constructor ? { constructor } : {}),
     ...optionalMember("exposed", "string", node.properties?.exposed),
     ...optionalMember("deprecated", "string", node.properties?.deprecated),
     ...optionalMember(
@@ -294,11 +301,15 @@ 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>[] = [];