ES6 & ES7 supportV8 5.2 contains support for ECMAScript 6 (aka ES2015) and ECMAScript 7 (aka ES2016).
Exponentiation operatorThis release contains support for the ES7 exponentiation operator, an infix notation to replace Math.pow.
let n = 3**3; // n == 27
n **= 2; // n == 729
Evolving specFor more information on the complexities behind support for evolving specifications and continued standards discussion around web compatibility bugs and tail calls, see the V8 blog post ES6, ES7, and beyond.
V8 APIPlease check out our summary of API changes. This document gets regularly updated a few weeks after each major release.