Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/1639
`grunt serve` and `grunt build` work will but `grunt test` failed. I am not
sure this is due to the change in this PR
```
$ grunt test
...
Running "karma:unit" (karma) task
INFO [karma]: Karma v0.12.37 server started at http://localhost:9002/
INFO [launcher]: Starting browser PhantomJS
WARN [launcher]: PhantomJS have not captured in 60000 ms, killing.
INFO [launcher]: Trying to start PhantomJS again (1/2).
WARN [launcher]: PhantomJS have not captured in 60000 ms, killing.
INFO [launcher]: Trying to start PhantomJS again (2/2).
WARN [launcher]: PhantomJS have not captured in 60000 ms, killing.
ERROR [launcher]: PhantomJS failed 2 times (timeout). Giving up.
Warning: Task "karma:unit" failed. Use --force to continue.
Aborted due to warnings.
Execution Time (2016-11-15 14:28:46 UTC)
babel:dev 4.8s ââ 2%
concurrent:test 17.6s ââââââ 9%
karma:unit 3m 0.4s
âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ
88%
Total 3m 24.5s
```
Regarding to `grunt serve` it takes time more than before (i changed some
`var` keyword to `let` to test this).
However, I pretty sure that we can reduce build time by using more enhanced
tools (webpack, upper version babel and node and so on)
```
Running "newer:babel:dev" (newer) task
Running "babel:dev" (babel) task
Running
"newer-postrun:babel:dev:3:/Users/lambda/github/apache-zeppelin/zeppelin-review/zeppelin-web/node_modules/grunt-newer/.cache"
(newer-postrun) task
Done, without errors.
Execution Time (2016-11-15 14:39:16 UTC)
loading tasks 157ms ââââ 5%
eslint:all 275ms ââââââ 8%
jscs:all 305ms ââââââ 9%
babel:dev 2.7s
âââââââââââââââââââââââââââââââââââââââââââââââââââââ
77%
Total 3.5s
```
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