> 1. As i see you only support for visual studio with autocomplete. Is it possible to use webstorm or another IDE like that with that type definition file?
Javascript autocompletion is brand-new feature from Microsoft, which is only available with MS products currently (as far as I know).
> 2. Since you say, you only use unreal.js for rapid prototyping and editor extensions, is it really slow for real games when you compare it to blueprint?
No. Actualy it will be much faster than Blueprint, but it requires JIT to be completed in run time, which will introduces ‘warm-up’ overhead. Latest version of V8 provides ‘snapshot’ of memory, which allows bulk-loading. I think there are some rooms to overcome this overhead.
> 3. I can see the most of it’s advantages comparing to blueprint (like having full access to whole api) but what are the disadvantages? I’m sure there are a lot of people like me that only uses blueprint and doesn’t know much about how things work under hood and wondering how is unreal.js compared to blueprint or c++ for unreal engine.
I think most disadvantages are what I wrote above, and Unreal.js has no mobile port currently, this seems to be a major disadvantage of current version.
Thanks!