Fix typed-throws JSRemote compilation on 6.3 build-examples

Co-authored-by: Shelley <shelley@exe.dev>

Author: kateinoigakukun

Sources/JavaScriptEventLoop/JSRemote.swift

@@ -35,15 +35,48 @@ extension JSRemote where T == JSObject {
     public func withJSObject<R: Sendable, E: Error>(
         _ body: @Sendable @escaping (JSObject) throws(E) -> R
     ) async throws(E) -> sending R {
-        do throws(E) {
-            return try await _withJSObjectAnyError { object in
-                try body(object)
-            }
-        } catch let error as E {
-            throw error
-        } catch {
-            preconditionFailure("Unexpected JSRemote error type: \(error)")
+        #if _runtime(_multithreaded)
+        if storage.sourceTid == swjs_get_worker_thread_id_cached() {
+            return try body(storage.sourceObject)
         }
+        return try await withCheckedThrowingContinuation { continuation in
+            let context = _JSRemoteContext(
+                sourceObject: storage.sourceObject,
+                body: body,
+                continuation: continuation
+            )
+            swjs_request_remote_jsobject_body(
+                storage.sourceTid,
+                Unmanaged.passRetained(context).toOpaque()
+            )
+        }
+        #else
+        return try body(storage.sourceObject)
+        #endif
+    }
+
+    @available(*, deprecated, message: "Use typed-throws withJSObject(_:)")
+    private func _withJSObjectAnyError<R: Sendable>(
+        _ body: @Sendable @escaping (JSObject) throws(any Error) -> R
+    ) async throws(any Error) -> sending R {
+        #if _runtime(_multithreaded)
+        if storage.sourceTid == swjs_get_worker_thread_id_cached() {
+            return try body(storage.sourceObject)
+        }
+        return try await withCheckedThrowingContinuation { continuation in
+            let context = _JSRemoteContext(
+                sourceObject: storage.sourceObject,
+                body: body,
+                continuation: continuation
+            )
+            swjs_request_remote_jsobject_body(
+                storage.sourceTid,
+                Unmanaged.passRetained(context).toOpaque()
+            )
+        }
+        #else
+        return try body(storage.sourceObject)
+        #endif
     }
 
     private func _withJSObjectAnyError<R: Sendable>(