gatsby-ssr.js

/**
 * Implement Gatsby's SSR (Server Side Rendering) APIs in this file.
 *
 * See: https://www.gatsbyjs.org/docs/ssr-apis/
 */

// You can delete this file if you're not using it
/* eslint-disable react/no-danger */

const React = require('react');
const { renderToString } = require('react-dom/server');
const JssProvider = require('react-jss/lib/JssProvider').default;
const getPageContext = require('./src/getPageContext').default;

function replaceRenderer({ bodyComponent, replaceBodyHTMLString, setHeadComponents }) {
  // Get the context of the page to collected side effects.
  const muiPageContext = getPageContext();

  const bodyHTML = renderToString(
    <JssProvider registry={muiPageContext.sheetsRegistry}>{bodyComponent}</JssProvider>,
  );

  replaceBodyHTMLString(bodyHTML);
  setHeadComponents([
    <style
      type="text/css"
      id="jss-server-side"
      key="jss-server-side"
      dangerouslySetInnerHTML={{ __html: muiPageContext.sheetsRegistry.toString() }}
    />,
  ]);
}

exports.replaceRenderer = replaceRenderer;