diff --git a/filter_files.py b/filter_files.py
index 204e97a..9773b4e 100644
--- a/filter_files.py
+++ b/filter_files.py
@@ -2,5 +2,5 @@
 import json
 
 if __name__ == "__main__":
-  files = sys.argv[1].split("\n")
+  files = [x for x in sys.argv[1].split("\n") if x.endswith("js") or x.endswith("map")]
   print(json.dumps(files))