INNER CODE UNIT · TypeScript

persistLanguage

i18next/next-i18next · src/appRouter/proxy/index.ts:33

  const persistLanguage = (req: NextRequest, response: NextResponse, lng: string) => {
    if (!config.persistCookie) return
    if (req.cookies.get(config.cookieName)?.value === lng) return
    response.cookies.set(config.cookieName, lng, {
      path: '/',
      maxAge: config.cookieMaxAge,
      sameSite: 'lax',
      ...config.cookieOptions,
    })
  }

  return function middleware(req: NextRequest): NextResponse {
    // nextUrl.pathname has Next's own basePath (next.config) stripped; String(nextUrl)
    // adds it back. Redirect/rewrite targets are therefore built from nextUrl.clone(),
    // never from `new URL(path, req.url)`, which would drop that basePath (and trailingSlash).
    const { pathname } = req.nextUrl

    // When basePath is set, only handle requests under that prefix

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