Visual Studio Code (VSCode)
Became my main code editor sometime in mid 2018 taking over from Webstorm. It feels lightweight, is free, and unlimited extensions are available.
Webstorm is an excellent IDE. I very reluctantly moved over to VSCode and still keep it around and use on a few select projects just because it is so great.
Built by the same folks that brought you Webstorm and many other amazing IDEs.
Don't use this so much as an editor but rather use many of the tools that are available with Xcode. Also needed for generating iOS apps from React Native.