title: How does <Component {...pageProps} /> function?
body: <p>newbie here, </p>
  
  <p>The code Im learning from <a href="https://github.com/Shopify/shopify-demo-app-node-react/tree/charge-a-fee-using-the-billing-api-starter-files" rel="noreferrer">this</a> and
  I also find almost every _app.js have this line code too.</p>
  
  <pre><code>class Name extends App {
   render() {
      const { Component, pageProps } = this.props;
      const config = { some config here };
      return (
          &lt;AppProvider config = { config }&gt;
            &lt;Component {...pageProps} /&gt;
          &lt;/AppProvider&gt;
      );
    }
  }
  </code></pre>
  
  <p>I know that <code>&lt;Component {...pageProps} /&gt;</code> part represents all other pages. And when I navigate page it change in pageprops. </p>
  
  <p>It just I don't know how it call other page?</p>