test.js

const MyFunctionalityComponent = React.createClass({
  myFunctionalityMethod() {
    // do some functionality
  }
  
  render() {
    if (isMobile) {
      return <MyMobileComponent onInteraction={this.myFunctionalityMethod} />
    } else {
      return <MyDesktopComponent onInteraction={this.myFunctionalityMethod} />
    }
  }
});