feat: add typed conditional API responses

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

@@ -0,0 +1,18 @@
+use api_macros::api;
+
+pub struct Body;
+
+#[api]
+pub trait UndeclaredStatusApi {
+    #[get(
+        "/status",
+        responses = [(status = 200, body = Body)]
+    )]
+    async fn status(&self) -> undeclared_status_api_responses::Status;
+}
+
+fn invalid() -> undeclared_status_api_responses::Status {
+    undeclared_status_api_responses::Status::Status201 { body: Body }
+}
+
+fn main() {}