As a minor note—the exponentiation operator was added in ES2016 / ES7, not ES2015 / ES6. It wouldn’t matter, except you need to tell all your tools (Terser, etc

As a minor note—the exponentiation operator was added in ES2016 / ES7, not ES2015 / ES6. It wouldn’t matter, except you need to tell all your tools (Terser, etc.) that you are using ES2016 or they will throw syntax errors when processing your code.