add lint
diff --git a/analysis_options.yaml b/analysis_options.yaml
index 1aa11af..ab3a9b3 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -13,3 +13,4 @@
     - prefer_const_declarations
     - prefer_const_literals_to_create_immutables
     - prefer_final_fields
+    - type_annotate_public_apis