ES6 support

[danielgroen]

Hi,

I run this command on es6: "type": "module" in my package json.
However when i refer to the standalone.js i get the notification that i can't use require(); Since i don't use commonjs

Can you also build a es6 export?

Note: there was nothing wrong with my config file since i used the default config.

[linpengteng]

May be you can use .cjs

[rainTai]

#199