Note that for using it you need to enable it support on babel, welcome to modern javascript, these are the pieces of software that I recommend you to get familiar with it: Webpack and Babel.
Webpack will bundle all your javascript (css and other stuff) in a single bundle. Babel will let you to develop on newer versions of javascript that would not be available on old browsers, and it will transpile to old javascript
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“If you're going to try, go all the way. Otherwise, don't even start. ..."
Charles Bukowski