I just upgraded to 2016.1, and I had to download additional libraries like 'node-DefinitelyTyped' just to get rid of 'unresolved' warnings for basic stuff like require(), despite the fact 'ECMAScript 6' was already 'predefined.' I don't remember having to do this in the past.
Also, nothing has documentation available anymore. I was pretty new to Webstorm in the last version, so I don't remember what all was documented, but I though I remember it at least showing method signatures etc. in the absence of explicit docs. This includes the things I downloaded libraries for, e.g. require(). Am I crazy, or is this all normal? I feel like I lost an important setting or something, but can't figure it out. Code completion seems to be working, that's about it.