fix(route-meta): deduplicate routing-meta imports by _importHash only (#4120)

Author: OskarLebuda

src/build/virtual/routing-meta.ts

@@ -5,10 +5,7 @@ export default function routingMeta(nitro: Nitro) {
     id: "#nitro/virtual/routing-meta",
     template: () => {
       const handlers = Object.values(nitro.routing.routes.routes).flatMap((h) => h.data);
-      const routeHandlers = uniqueBy(
-        handlers,
-        (h) => `${h._importHash}_${h.method?.toLowerCase() || ""}_${h.route || ""}`
-      );
+      const routeHandlers = uniqueBy(handlers, "_importHash");
 
       return /* js */ `
   ${routeHandlers
@@ -29,6 +26,6 @@ export const handlersMeta = [
   };
 }
 
-function uniqueBy<T>(arr: T[], key: (item: T) => string): T[] {
-  return [...new Map(arr.map((item) => [key(item), item])).values()];
+function uniqueBy<T>(arr: T[], key: keyof T): T[] {
+  return [...new Map(arr.map((item) => [item[key], item])).values()];
 }