I can't say much about atom but I was just wondering if you have checked out visual studio code ? If the Intellisense you are looking for is missing you could add it based on your needs using tsd to the current project you are working on.

npm install tsd -g #if tsd is not installed yet

# cd to your project folder

tsd query -r -o -a install react

snippet grabbed from http://www.johnpapa.net/intellisense-witha-visual-studio-cod...

edited: add line break