Next.js SSR example question

In the nextjs example pages/_app.js

  componentDidMount() {
    // Remove the server-side injected CSS.
    const jssStyles = document.querySelector('#jss-server-side');
    if (jssStyles && jssStyles.parentNode) {
      jssStyles.parentNode.removeChild(jssStyles);
    }
  }

Why remove the injected css ?

I use koa to deploy the nextjs app, after I build it. The styles will be removed if I add this.

[codyng]

So can we disable the generation of injection of <style id="jss-server-side">html {…} into the HTML so we don’t need to manually remove it in the client side script?

[blastZ]

@oliviertassinari That’s clear, thanks for your help.