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Server-Side Render

The getSandpackCssText function, which is available in the main package, is responsible for getting the Sandpack CSS string and server-side render it. Furthermore, Sandpack uses stitches/core under the hood to generate and dedupe theme variation, ensuring a consistent and lightweight CSS output.

import { getSandpackCssText } from "@codesandbox/sandpack-react";

const cssTextOutput = getSandpackCssText();

How to use it

Here's some examples of how to use in some popular React frameworks.

Reminder

For a better hydration strategy, we highly recommend adding an id="sandpack" to your style tag.

Next.js

// examples/nextjs/pages/_document.tsx

import { getSandpackCssText } from "@codesandbox/sandpack-react";
import { Html, Head, Main, NextScript } from "next/document";

export default function Document() {
  return (
    <Html>
      <Head>
        <style
          dangerouslySetInnerHTML={{ __html: getSandpackCssText() }}
          id="sandpack"
        />
      </Head>
      <body>
        <Main />
        <NextScript />
      </body>
    </Html>
  );
}

Gatsby

// examples/gatsby/gatsby-ssr.js
import * as React from "react";
import { getSandpackCssText } from "@codesandbox/sandpack-react";

export const onRenderBody = ({ setHeadComponents }) => {
  setHeadComponents([
    <style
      id="sandpack"
      dangerouslySetInnerHTML={{
        __html: getSandpackCssText(),
      }}
    />,
  ]);
};

Examples

Still not clear, take a look at these examples.