This is really cool! I have been using Exponent (Expo) on a side project for 5 months and love it. Can I ask what editor this is built on? I've been consideri

This is really cool! I have been using Exponent (Expo) on a side project for 5 months and love it. Can I ask what editor this is built on? I've been considering for another project having a "live editor" for writing extensions, and this is the best ES6 + linter I've seen! Is any of this app open source?