Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/2002
@DmytroShkvyra
If you want to use node modules in terminal, you have to install them
globally. (e.g `$ yarn install`)
But in case of grunt (and karma so on..), we don't need to do that. Since
they are used in `scripts` (package.json). That's what i meant.
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