Do not set cookies when we don't use a document

Author: garronej

src/lib/darkMode.ts

@@ -72,6 +72,8 @@ function getCurrentIsDarkFromHtmlAttribute(): boolean {
     assert(false);
 }
 
+export const refDoPersistDarkModePreferenceWithCookie = { "current": false };
+
 export function startObservingColorSchemeHtmlAttribute() {
     $isDark.current = getCurrentIsDarkFromHtmlAttribute();
 
@@ -84,26 +86,11 @@ export function startObservingColorSchemeHtmlAttribute() {
     );
 
     {
-        /*
-        const setColorSchemeCookie = (colorScheme: ColorScheme) => {
-            let newCookie = `${data_fr_theme}=${colorScheme};path=/;max-age=31536000`;
-
-            set_domain: {
-                const { hostname } = window.location;
-
-                //We do not set the domain if we are on localhost or an ip
-                if (/(^localhost$)|(^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$)/.test(hostname)) {
-                    break set_domain;
-                }
-
-                newCookie += `;domain=${hostname}`;
+        const setColorSchemeCookie = (isDark: boolean) => {
+            if (!refDoPersistDarkModePreferenceWithCookie.current) {
+                return;
             }
 
-            document.cookie = newCookie;
-        };
-        */
-
-        const setColorSchemeCookie = (isDark: boolean) => {
             const colorScheme: ColorScheme = isDark ? "dark" : "light";
 
             let newCookie = `${data_fr_theme}=${colorScheme};path=/;max-age=31536000;SameSite=Strict`;

src/next.tsx

@@ -22,7 +22,12 @@ import appleTouchIcon from "./dsfr/favicon/apple-touch-icon.png";
 import faviconSvg from "./dsfr/favicon/favicon.svg";
 import faviconIco from "./dsfr/favicon/favicon.ico";
 import faviconWebmanifestUrl from "./dsfr/favicon/manifest.webmanifest";
-import { data_fr_scheme, data_fr_theme, isDarkContext } from "./lib/darkMode";
+import {
+    data_fr_scheme,
+    data_fr_theme,
+    isDarkContext,
+    refDoPersistDarkModePreferenceWithCookie
+} from "./lib/darkMode";
 import type { ColorScheme } from "./lib/darkMode";
 import DefaultDocument from "next/document";
 
@@ -119,6 +124,10 @@ export function createNextDsfrIntegrationApi(params: Params): NextDsfrIntegratio
         ...startDsfrReactParams
     } = params;
 
+    if (doPersistDarkModePreferenceWithCookie) {
+        refDoPersistDarkModePreferenceWithCookie.current = true;
+    }
+
     if (isBrowser) {
         startDsfrReact(startDsfrReactParams);
     } else {