Github user 1ambda commented on the issue: https://github.com/apache/zeppelin/pull/1659 @cloverhearts Thanks for your comment. I have some questions. - How we can check one of our dependencies doens't work on 6.x but works in 4.x even build passes? - As I know, all node modules are dev dependencies and doesn't affect on frontend libraries (bower packages). They are just concated and added to HTML. Are not they? ([Gruntfile.js of es6 PR](https://github.com/felizbear/zeppelin/blob/f083492cfb22073732ee4af70d1cb1d02b743706/zeppelin-web/Gruntfile.js))
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