Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1824
`mvn clean` in `zeppelin-web` module now removes
[`bower_components`](https://github.com/apache/zeppelin/blob/master/zeppelin-web/pom.xml#L180).
what do you think about making `mvn clean` run `npm run clean` as well?
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