What is *propTypes* type checking, what is it for? How to use in reality?

Question

React

Good time! Guys need help, ran into this code

class PageContainer extends PureComponent {
  render() {
    const {
      children,
    } = this.props;

    return (
      <section className='PageContainer'>
        {children}
      </section>
    );
  }
}

PageContainer.propTypes = {
  children: PropTypes.node,
};

Well, first we make a variable to add properties to react for all components? *const {
children,
} = this.props;*
Then we display some content with this property *return (
{children}
*
What is the last thing? How does it work in place? Maybe I'm still stupid and write nonsense?)

Answer 1

Read about type checking