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Upgrade i18next v26 + react-i18next v17 with SSR-safe init

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Split initI18n() into separate server/client initialization paths
inspired by remix-i18next's architecture:

- initI18nServer(lng): no LanguageDetector, per-request language from
  Accept-Language header
- initI18nClient(): LanguageDetector reads <html lang> first to match
  server, then localStorage and navigator
- detectLanguage(request): parses Accept-Language for best match

Fixes rehydration errors caused by v26 removing initImmediate option
(replaced with initAsync) and LanguageDetector running on the server
where browser APIs don't exist.

Also makes <html lang> dynamic instead of hardcoded "en".

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Ullrich Schäfer 2026-03-29 11:38:36 +02:00
parent 4be716687a
commit 79f000fcc5
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10 changed files with 166 additions and 40 deletions
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6
apps/journal/app/root.tsx
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@ -4,17 +4,15 @@ import type { LinksFunction } from "react-router";
import type { Route } from "./+types/root";
import * as Sentry from "@sentry/react";
import { useTranslation } from "react-i18next";
import { initI18n } from "@trails-cool/i18n";
import { getSessionUser } from "~/lib/auth.server";
import stylesheet from "@trails-cool/ui/styles.css?url";
initI18n();
export const links: LinksFunction = () => [{ rel: "stylesheet", href: stylesheet }];
export function Layout({ children }: { children: React.ReactNode }) {
const { i18n } = useTranslation();
return (
<html lang="en">
<html lang={i18n.language}>
<head>
<meta charSet="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />