diff --git a/typescript/option/.gitignore b/typescript/option/.gitignore
index 25d4951..e7a5d37 100644
--- a/typescript/option/.gitignore
+++ b/typescript/option/.gitignore
@@ -1,3 +1,4 @@
 node_modules
 dist
-sandbox
\ No newline at end of file
+sandbox
+lib
\ No newline at end of file