Mixins are being considered for ES2016: https://esdiscuss.org/topic/about-lightweight-traits https://esdiscuss.org/topic/about-lightweight-traits meanwhile you

Mixins are being considered for ES2016: https://esdiscuss.org/topic/about-lightweight-traits https://esdiscuss.org/topic/about-lightweight-traits meanwhile you can Object.assign behavior into things.