fix(toEventHandler): validate h3 subapp instance to pick .handler

pi0 · pi0 · commit a94b7fbc2fef · 2026-05-01T20:42:05.000+02:00
diff --git a/src/h3.ts b/src/h3.ts
@@ -29,6 +29,8 @@ import { toEventHandler } from "./handler.ts";
 export const NoHandler: EventHandler = () => kNotFound;
 
 export class H3Core implements H3CoreType {
+  static "~h3" = true;
+
   readonly config: H3CoreConfig;
 
   "~middleware": Middleware[];
diff --git a/src/handler.ts b/src/handler.ts
@@ -167,7 +167,7 @@ export function toEventHandler(handler: HTTPHandler | undefined): EventHandler |
   if (typeof handler === "function") {
     return handler;
   }
-  if (typeof (handler as H3Core)?.handler === "function") {
+  if (typeof (handler as H3Core)?.handler === "function" && (handler as any).constructor?.["~h3"]) {
     return (handler as H3Core).handler;
   }
   if (typeof (handler as FetchableObject)?.fetch === "function") {

Original file line number	Diff line number	Diff line change
`@@ -167,7 +167,7 @@ export function toEventHandler(handler: HTTPHandler \| undefined): EventHandler \|`
`167`	`167`	`if (typeof handler === "function") {`
`168`	`168`	`return handler;`
`169`	`169`	`}`
`170`		`- if (typeof (handler as H3Core)?.handler === "function") {`
	`170`	`+ if (typeof (handler as H3Core)?.handler === "function" && (handler as any).constructor?.["~h3"]) {`
`171`	`171`	`return (handler as H3Core).handler;`
`172`	`172`	`}`
`173`	`173`	`if (typeof (handler as FetchableObject)?.fetch === "function") {`