he/him 
To use es6 in node: require('babel/register') at entry point of app. That's it! Google results for "es6 in nodejs" don't mention this.
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@sebmck so really the most performant way is to build lib -> src and run from src?@miranext@andrewray@bahmutov
@knownasilya As I said before, it uses a cache so you'll only get a small performance hit on first load. @miranext @andrewray @bahmutov
