This is switching and ES2017 is the name we should standardize on to avoid confusion. For example, Typescript accepts targets "ES6" or "ES2015" as synonyms, but

This is switching and ES2017 is the name we should standardize on to avoid confusion. For example, Typescript accepts targets "ES6" or "ES2015" as synonyms, but it doesn't have targets "ES7" or "ES8", only "ES2016" and "ES2017". I personally prefer the terse version, but there are advantages to using the year-based naming.