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Other backends

Configure SSR in in frameworks other than Next.js like for example Express.js
MUI: Theses instructions are for the peoples using tss-react as a standalone solution.
MUI users can refer to the MUI documentation relative to SSR and ignore this.
If you are using nested selectors, you may need to provide uniq identifiers to the styleshees that uses nested selectors.
yarn add @emotion/server

Single emotion cache

This is the recommended approach.
import createEmotionServer from "@emotion/server/create-instance";
import { renderToString } from "react-dom/server";
import type { EmotionCache } from "@emotion/cache";
import { App, createAppCache } from "<see_below>/App";
function functionInChargeOfRenderingTheHtml(res) {
const {
constructStyleTagsFromChunks,
extractCriticalToChunks
} = createEmotionServer(createAppCache());
const html = renderToString(<App />);
const styleTagsAsStr = constructStyleTagsFromChunks(extractCriticalToChunks(html));
//Some framworks, like Gatsby or Next.js, only enables you to
//provide your <style> tags as React.ReactNode[].
//const styleTagsAsReactNode = [
// ...emotionServers
// .map(({ extractCriticalToChunks }) =>
// extractCriticalToChunks(html)
// .styles.filter(({ css }) => css !== "")
// .map(style => (
// <style
// data-emotion={`${style.key} ${style.ids.join(" ")}`}
// key={style.key}
// dangerouslySetInnerHTML={{ "__html": style.css }}
// />
// ))
// ).reduce((prev, curr) => [...prev, ...curr], [])
//];
res.status(200).header("Content-Type", "text/html").send([
'<!DOCTYPE html>',
'<html lang="en">',
'<head>',
' <meta charset="UTF-8">'
' <title>My site</title>',
styleTagsAsStr,
'</head>',
'<body>',
<div id="root">${html}</div>,
' <script src="./bundle.js"></script>',
'</body>',
'</html>'
].join("\n"));
}
App.tsx
import { CacheProvider } from "@emotion/react";
import createCache from "@emotion/cache";
let appCache: EmotionCache | undefined = undefined;
export const crateAppCache = () =>
appCache = createCache({
"key": "css"
});
export function App(){
return (
<CacheProvider value={appCache ?? createAppCache()}>
{/* ... */}
</CacheProvider>
);
}

MUI and TSS use different caches

Alternatively, if you want TSS and MUI to use different caches you can implement this approach:
import createEmotionServer from "@emotion/server/create-instance";
import { renderToString } from "react-dom/server";
import type { EmotionCache } from "@emotion/cache";
import { App, createMuiCache, createTssCache } from "<see_below>/App";
function functionInChargeOfRenderingTheHtml(res) {
const emotionServers = [
createMuiCache(),
createTssCache()
].map(createEmotionServer);
const html = renderToString(<App />);
const styleTagsAsStr = emotionServers
.map(({ extractCriticalToChunks, constructStyleTagsFromChunks }) =>
constructStyleTagsFromChunks(extractCriticalToChunks(html)),
)
.join("");
//Some framworks, like Gatsby or Next.js, only enables you to
//provide your <style> tags as React.ReactNode[].
//const styleTagsAsReactNode = [
// ...emotionServers
// .map(({ extractCriticalToChunks }) =>
// extractCriticalToChunks(html)
// .styles.filter(({ css }) => css !== "")
// .map(style => (
// <style
// data-emotion={`${style.key} ${style.ids.join(" ")}`}
// key={style.key}
// dangerouslySetInnerHTML={{ "__html": style.css }}
// />
// ))
// ).reduce((prev, curr) => [...prev, ...curr], [])
//];
res.status(200).header("Content-Type", "text/html").send([
'<!DOCTYPE html>',
'<html lang="en">',
'<head>',
' <meta charset="UTF-8">'
' <title>My site</title>',
styleTagsAsStr,
'</head>',
'<body>',
<div id="root">${html}</div>,
' <script src="./bundle.js"></script>',
'</body>',
'</html>'
].join("\n"));
}
App.tsx
import { CacheProvider } from "@emotion/react";
import createCache from "@emotion/cache";
import { TssCacheProvider } from "tss-react";
let muiCache: EmotionCache | undefined = undefined;
export const createMuiCache = () =>
muiCache = createCache({
"key": "mui",
"prepend": true
});
let tssCache: EmotionCache | undefined = undefined;
export const createTssCache = () =>
muiCache = createCache({
"key": "tss"
});
export function App(){
return (
<CacheProvider value={muiCache ?? createMuiCache()}>
<TssCacheProvider value={tssCache ?? createTssCache()}>
{/* ... */}
</TssCacheProvider>
</CacheProvider>
);
}