Support methods without names in interfaces (#2169)

Author: Bashamega

inputfiles/addedTypes.jsonc

@@ -340,27 +340,6 @@
                 "extends": "DOMRect",
                 "noInterfaceObject": true
             },
-            /*
-              Keeping EventListener and EventListenerObject isn't the most elegant way to handle
-              the event listeners, but we need to keep the EventListener as an extendable interface
-              for libraries like angular.
-            */
-            "EventListener": {
-                "name": "EventListener",
-                "noInterfaceObject": true,
-                "methods": {
-                    "method": {
-                        // This is a hack to add a call signature, but I think it's reasonable
-                        // as it means we don't have to add a call signatures section to the
-                        // emitter for this one case.
-                        "callable": {
-                            "overrideSignatures": [
-                                "(evt: Event): void"
-                            ]
-                        }
-                    }
-                }
-            },
             "EventListenerObject": {
                 "name": "EventListenerObject",
                 "noInterfaceObject": true,

inputfiles/patches/dom.kdl

@@ -1,3 +1,10 @@
+// Keeping EventListener and EventListenerObject isn't the most elegant way to handle the event listeners, but we need to keep the EventListener as an extendable interface for libraries like angular.
+interface EventListener noInterfaceObject=#true {
+    method "" returns=void {
+        param evt type=Event
+    }
+}
+
 enum InsertPosition {
     beforebegin
     beforeend

src/build/patches.ts

@@ -244,14 +244,12 @@ function handleMethod(child: Node): Partial<Method> {
     }
   }
 
-  if (!typeNode) {
-    throw new Error(`Method "${name}" is missing a return type`);
-  }
-
   const signature: Method["signature"] = [
     {
       param: params,
-      ...handleTyped(typeNode),
+      ...(typeNode
+        ? handleTyped(typeNode)
+        : { type: string(child.properties?.returns) }),
     },
   ];
   return { name, signature };