With a new WebStorm 2016.3 EAP you can now run and debug @reactnative apps from WebStorm:
https://blog.jetbrains.com/webstorm/2016/10/webstorm-2016-3-eap-163-6512/ …pic.twitter.com/A17z1R9XKc
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Windows Defender is doing it again today 
Yeah, I had it also on my latest EAP update
the upgrade did work at the end, but I suspect it failed first, and fell back to downloading the entire package. took a while.
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