medium-rebem-2.js

import React from 'react';
import b from 'b_';

const block = b.with('popup');

class Popup extends React.Component {
  render() {
    return (
      <div className={b({ visible: this.props.visible })}>
        <div className={b('overlay')}></div>
        <div className={b('content')}>{this.props.children}</div>
      </div>
    );
  }
}

Hey Denis, tell me please, how exactly does this work? This looks nice, I'd like to use this technique.

Thank you in advance!