const t = <SomeOtherComponent someProp="test" />;
class MyComponent extends React.Component {
    render() {
        return t;
    }
}
// Assume SomeOtherComponent is in a different file.
class SomeOtherComponent extends React.Component {
    constructor(props) {
        super(props);
        console.log("NEW!!");
    }
    render() {
        return this.props.someProp;
    }
}