ECMAScript* (insert 6, 2015, 7, 2016, whatever here) is a hot topic and rightfully in the spotlight. After 15 years of weird ups and downs we now have a ratified version of the language that powers the web. ES6 answers many demands developers had and our products need, but it still suffers from the issue that not all runtimes support it. Instead of waiting for everyone to upgrade or blocking out users we have the option to transpile or to choose a subset of JS to achieve compliance with our needs and wants. In this talk Chris Heilmann shows the pros and cons of these approaches.