feat(api): declare typed WebSocket operations

crates/api-macros/tests/ui/invalid_websocket_response_body.rs

@@ -0,0 +1,19 @@
+use api_macros::api;
+
+pub struct Frame;
+pub struct Response;
+
+#[api]
+pub trait InvalidWebSocketResponseBodyApi {
+    #[websocket(
+        "/events",
+        method = GET,
+        client_to_server = Frame,
+        server_to_client = Frame,
+        path_parameters = [],
+        response = Response
+    )]
+    type Events;
+}
+
+fn main() {}