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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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GPG key ID: A32FF691A0F752D9
10 changed files with 166 additions and 40 deletions
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3
apps/journal/app/entry.server.tsx
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@ -6,6 +6,7 @@ import { ServerRouter } from "react-router";
import { isbot } from "isbot";
import type { RenderToPipeableStreamOptions } from "react-dom/server";
import { renderToPipeableStream } from "react-dom/server";
import { initI18nServer, detectLanguage } from "@trails-cool/i18n";
const sentryEnvironment = process.env.CI ? "ci" : (process.env.NODE_ENV ?? "development");
@ -32,6 +33,8 @@ export default function handleRequest(
routerContext: EntryContext,
_loadContext: AppLoadContext,
) {
initI18nServer(detectLanguage(request));
if (request.method.toUpperCase() === "HEAD") {
return new Response(null, {
status: responseStatusCode,