var Bar1 = base => class extends base {
  componentWillMount(){
    super.componentWillMount();
    console.log('Bar1');
  }
};

var Bar2 = base => class extends base {
  componentWillMount(){
    super.componentWillMount();
    console.log('Bar2');
  }
};

class Foo extends mixins(Bar1, Bar2) {
  componentWillMount() {
    console.log('Foo before mixins');
    super.componentWillMount();
    console.log('Foo after mixins');
  }
}