this commit caused a problem in our work (attached in the first screenshot) ...
this screenshot shows the cmd error displayed when building our project :

need help !!
+1 all our builds are failing
+1
+1 bump
same. .../node_modules/react-transition-group/esm/Transition.js is failing... damn.
Reverting to 2.6.1 until further notice.
I reverted the breaking commit and released a patch version, v2.7.1 should be stable now. We need some more expertise on publishing modules correctly before we implement tree-shaking properly. Sorry everyone.
Thank you for the quick fix. Maybe an integration test which uses this package as library can avoid these problems in the future? (If only we had more time ;) )
Definitely! 馃憤