Initial setup

Setup @codegouvfr/react-dsfr in your project or start from a template

If you already had the DSFR installed in your project, let's start from scratch:

Remove from your dependencies.
Remove the import ofdsfr.css, dsfr.module.js the favicon and the fonts.
Remove the data-fr-scheme (and data-fr-theme ) attribude from your <html/> tag

yarn add @codegouvfr/react-dsfr

npm install --save @codegouvfr/react-dsfr

pnpm add @codegouvfr/react-dsfr

And add this file to the root of your project, to enable pre & post scripts with pnpm:

.npmrc

enable-pre-post-scripts=true

When we say Yarn we usually refer to Yarn 1.x as most dev teams (Including me) havent upgraded to the newest version (for good reasons).

If you want to use Yarn Berry you be aware that pre- post- scripts aren't supported.

So you must do something like "dev": "copy-dsfr-to-public && next dev" (same thing for start)

Also you must configure it so it uses node_modules (sorry)

If you want a more complete starter with a Ready yo use stack that includes routing, autentication, internationalisation ect. you can also use this starter instead:

Add these three scripts to your package.json:

package.json

"scripts": {
    "predev": "react-dsfr update-icons",
    "prebuild": "react-dsfr update-icons"
}

Trigger the execution of the postinstall script by running:

yarn # Or 'npm install' or 'pnpm install'

Add the following tags in the <head />

index.html

<link rel="apple-touch-icon" href="./node_modules/@codegouvfr/react-dsfr/favicon/apple-touch-icon.png" />
<link rel="icon" href="./node_modules/@codegouvfr/react-dsfr/favicon/favicon.svg" type="image/svg+xml" />
<link rel="shortcut icon" href="./node_modules/@codegouvfr/react-dsfr/favicon/favicon.ico" type="image/x-icon" />
<link rel="manifest" href="./node_modules/@codegouvfr/react-dsfr/favicon/manifest.webmanifest" crossorigin="use-credentials" />

<link rel="stylesheet" href="./node_modules/@codegouvfr/react-dsfr/main.css" />

src/main.tsx

import React from "react";
import ReactDOM from "react-dom/client";
import { App } from "./App";
import { startReactDsfr } from "@codegouvfr/react-dsfr/spa";
startReactDsfr({ defaultColorScheme: "system" });

ReactDOM.createRoot(document.getElementById("root") as HTMLElement).render(
  <React.StrictMode>
    <App />
  </React.StrictMode>
);

You're all set! Next step for you is to setup the integration with your routing library (react-router for example).

yarn add @codegouvfr/react-dsfr
yarn add --dev sass
npx degit https://github.com/garronej/react-dsfr-next-appdir-demo/src/dsfr-bootstrap src/dsfr-bootstrap

next.config.ts

import type { NextConfig } from "next";

const nextConfig: NextConfig = {
  /* config options here */
  webpack: config => {
    config.module.rules.push({
      test: /\.woff2$/,
      type: "asset/resource"
    });
    return config;
  }
};

export default nextConfig;

package.json

"scripts": {
    "predev": "react-dsfr update-icons",
    "prebuild": "react-dsfr update-icons"
}

src/app/layout.tsx

import { getHtmlAttributes, DsfrHead } from "../dsfr-bootstrap/server-only-index";
import { DsfrProvider } from "../dsfr-bootstrap";

export default function RootLayout({ children }: { children: React.JSX.Element; }) {
  const lang = undefined; // Can be "fr" or "en" ...
  return (
    <html {...getHtmlAttributes({ lang })} >
      <head>
        <DsfrHead />
      </head>
      <body>
        <DsfrProvider lang={lang}>
          {children}
        </DsfrProvider>
      </body>
    </html>
  );
}

src/app/page.tsx

import { StartDsfrOnHydration } from "../dsfr-bootstrap";

export default function Page() {
  return (
    <>
      {/* Important: You must mount this component on every pages of your App! */}
      <StartDsfrOnHydration />
      <h1>Welcome!</h1>
    </>
  );
}

You are in this case if you have a pages/ directory at the root of your project.

# If you plan to use MUI:  
yarn add @mui/material @emotion/react @emotion/server @emotion/styled @mui/material @emotion/react

next.config.js

/** @type {import('next').NextConfig} */
const nextConfig = {
  reactStrictMode: true,
  swcMinify: true,
  webpack: config => {
    config.module.rules.push({
      test: /\.woff2$/,
      type: "asset/resource"
    });
    return config;
  },
  //This option requires Next 13.1 or newer, if you can't update you can use this plugin instead: https://github.com/martpie/next-transpile-modules
  transpilePackages: [
      "@codegouvfr/react-dsfr", 
      "tss-react" // This is for MUI or if you use htts://tss-react.dev
  ],
  output: "export"
};

module.exports = nextConfig

package.json

"scripts": {
    "predev": "react-dsfr update-icons",
    "prebuild": "react-dsfr update-icons"
}

pages/_app.tsx

import type { AppProps } from "next/app";
import { createNextDsfrIntegrationApi } from "@codegouvfr/react-dsfr/next-pagesdir";
import Link from "next/link";

// Only in TypeScript projects
declare module "@codegouvfr/react-dsfr/next-pagesdir" {
    interface RegisterLink { 
        Link: typeof Link;
    }
}

const { 
    withDsfr,
    dsfrDocumentApi
} = createNextDsfrIntegrationApi({
    defaultColorScheme: "system",
    Link
});

export { dsfrDocumentApi };

function App({ Component, pageProps }: AppProps) {
    return <Component {...pageProps} />;
}

export default withDsfr(App);

pages/_document.tsx

import { Html, Head, Main, NextScript, DocumentProps } from "next/document";
import { dsfrDocumentApi } from "./_app";

const { 
  getColorSchemeHtmlAttributes, 
  augmentDocumentForDsfr 
} = dsfrDocumentApi;

export default function Document(props: DocumentProps) {
  return (
    <Html {...getColorSchemeHtmlAttributes(props)}>
      <Head />
      <body>
        <Main />
        <NextScript />
      </body>
    </Html>
  );
}

augmentDocumentForDsfr(Document);

The create-react-app project is no longer being maintained. If you are starting a new project you'll probably be beter off with Vite.

Add these three scripts to your package.json:

package.json

"scripts": {
    ...
    "postinstall": "react-dsfr copy-static-assets",
    "predev": "react-dsfr update-icons",
    "prebuild": "react-dsfr update-icons"
},
...
"jest": {
    "transformIgnorePatterns": [
      "node_modules/(?!@codegouvfr/react-dsfr)"
    ]
}

Trigger the execution of the postinstall script by running:

yarn # Or 'npm install' or 'pnpm install'

Add the following code in the <head />

public/index.html

<link rel="apple-touch-icon" href="%PUBLIC_URL%/dsfr/favicon/apple-touch-icon.png" />
<link rel="icon" href="%PUBLIC_URL%/dsfr/favicon/favicon.svg" type="image/svg+xml" />
<link rel="shortcut icon" href="%PUBLIC_URL%/dsfr/favicon/favicon.ico" type="image/x-icon" />
<link rel="manifest" href="%PUBLIC_URL%/dsfr/favicon/manifest.webmanifest" crossorigin="use-credentials" />

<link rel="stylesheet" href="%PUBLIC_URL%/dsfr/utility/icons/icons.min.css" />
<link rel="stylesheet" href="%PUBLIC_URL%/dsfr/dsfr.min.css" />

src/index.tsx

import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './App';
import { startReactDsfr } from "@codegouvfr/react-dsfr/spa";
startReactDsfr({ defaultColorScheme: "system" });

const root = ReactDOM.createRoot(
  document.getElementById('root') as HTMLElement
);
root.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>
);

You're all set! Next step for you is to setup de integration with your routing library (react-router for example)

Avoiding or flash of unstyled text (FOUT)

You can avoid having a flash of unstyled text by preloading the font variant used on your homepage (look in the network tab of your browser dev tools what are the font downloaded initially).

Add the following tags in the <head />

index.html

<!--<link rel="preload" href="./node_modules/@codegouvfr/react-dsfr/dsfr/fonts/Marianne-Light.woff2" as="font" crossorigin="anonymous" />-->
<!--<link rel="preload" href="./node_modules/@codegouvfr/react-dsfr/dsfr/fonts/Marianne-Light_Italic.woff2" as="font" crossorigin="anonymous" />-->
<link rel="preload" href="./node_modules/@codegouvfr/react-dsfr/dsfr/fonts/Marianne-Regular.woff2" as="font" crossorigin="anonymous" />
<!--<link rel="preload" href="./node_modules/@codegouvfr/react-dsfr/dsfr/fonts/Marianne-Regular_Italic.woff2" as="font" crossorigin="anonymous" />-->
<link rel="preload" href="./node_modules/@codegouvfr/react-dsfr/dsfr/fonts/Marianne-Medium.woff2" as="font" crossorigin="anonymous" />
<!--<link rel="preload" href="./node_modules/@codegouvfr/react-dsfr/dsfr/fonts/Marianne-Medium_Italic.woff2" as="font" crossorigin="anonymous" />-->
<link rel="preload" href="./node_modules/@codegouvfr/react-dsfr/dsfr/fonts/Marianne-Bold.woff2" as="font" crossorigin="anonymous" />
<!--<link rel="preload" href="./node_modules/@codegouvfr/react-dsfr/dsfr/fonts/Marianne-Bold_Italic.woff2" as="font" crossorigin="anonymous" />-->
<!--<link rel="preload" href="./node_modules/@codegouvfr/react-dsfr/dsfr/fonts/Spectral-Regular.woff2" as="font" crossorigin="anonymous" />-->
<!--<link rel="preload" href="./node_modules/@codegouvfr/react-dsfr/dsfr/fonts/Spectral-ExtraBold.woff2" as="font" crossorigin="anonymous" />-->

src/app/layout.tsx

import { getHtmlAttributes, DsfrHead } from "../dsfr-bootstrap/server-only-index";
import { DsfrProvider } from "../dsfr-bootstrap";

export default function RootLayout({ children }: { children: React.JSX.Element; }) {
  const lang = undefined; // Can be "fr" or "en" ...
  return (
    <html {...getHtmlAttributes({ lang })} >
      <head>
        <DsfrHead 
          preloadFonts={[
	    //"Marianne-Light",
            //"Marianne-Light_Italic",
	    "Marianne-Regular",
	    //"Marianne-Regular_Italic",
	    "Marianne-Medium",
	    //"Marianne-Medium_Italic",
	    "Marianne-Bold"
	    //"Marianne-Bold_Italic",
	    //"Spectral-Regular",
	    //"Spectral-ExtraBold"
	  ]}
        />
      </head>
      <body>
        <DsfrProvider lang={lang}>
          {children}
        </DsfrProvider>
      </body>
    </html>
  );
}

pages/_app.tsx

import type { AppProps } from "next/app";
import { createNextDsfrIntegrationApi } from "@codegouvfr/react-dsfr/next-pagesdir";
import Link from "next/link";

// Only in TypeScript projects
declare module "@codegouvfr/react-dsfr/next-pagesdir" {
    interface RegisterLink { 
        Link: typeof Link;
    }
}

const { 
    withDsfr,
    dsfrDocumentApi
} = createNextDsfrIntegrationApi({
    defaultColorScheme: "system",
    Link,
    preloadFonts: [
  	//"Marianne-Light",
        //"Marianne-Light_Italic",
	"Marianne-Regular",
	//"Marianne-Regular_Italic",
	"Marianne-Medium",
	//"Marianne-Medium_Italic",
	"Marianne-Bold",
	//"Marianne-Bold_Italic",
	//"Spectral-Regular",
	//"Spectral-ExtraBold"
    ]
});

export { dsfrDocumentApi };

function App({ Component, pageProps }: AppProps) {
    return <Component {...pageProps} />;
}

export default withDsfr(App);

Add the following code in the <head />

public/index.html

<%
[
  //"Marianne-Light",
  //"Marianne-Light_Italic",
  "Marianne-Regular",
  //"Marianne-Regular_Italic",
  "Marianne-Medium",
  //"Marianne-Medium_Italic",
  "Marianne-Bold",
  //"Marianne-Bold_Italic",
  //"Spectral-Regular",
  //"Spectral-ExtraBold"
].forEach(function(name){ %>
  <link rel="preload" href="%PUBLIC_URL%/dsfr/fonts/<%=name%>.woff2" as="font" crossorigin="anonymous" />
<% }); %>

NextIntegration with routing libs

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