diff --git a/.gitignore b/.gitignore
index 6eac26d9eb..ed650c3f69 100644
--- a/.gitignore
+++ b/.gitignore
@@ -57,5 +57,9 @@ typings/
 # dotenv environment variables file
 .env
 
+# built library using in commonjs module syntax
 lib
-lib-esm
\ No newline at end of file
+# built library using es6 module syntax to enable webpack and rollup tree shaking
+lib-esm
+# UMD bundles that export the global variable
+_bundles