WRNexusJS/packages/i18n

@wrnexus/i18n

Recursive locale loading, fallback resolution, SSR/browser translations, locale formatting, and language UI blocks for WRNexusJS.

Locale files

Both layouts can be used together:

app/locales/en.json
app/locales/en/common.json
app/locales/en/auth.json
app/locales/mr/common.json

Namespaced files become keys such as common.save and auth.signIn.

import { loadLocales, makeT, resolveI18n, resolveLang } from "@wrnexus/i18n";

const i18n = resolveI18n(loadLocales("app/locales", { strict: true }), {
  default: "en",
  locales: ["en", "mr", "hi"],
  fallbacks: { "mr-IN": ["mr", "en"] },
  cookie: { name: "wire-lang", sameSite: "Lax", secure: true },
});

const lang = resolveLang(i18n, cookieValue, request.headers.get("accept-language"));
const t = makeT(i18n, lang);
t("common.hello", { name: "Ajay" });

Resolution behavior

• normalized BCP-47-style locale names
• cookie preference
• weighted Accept-Language
• wildcard language ranges
• regional base fallback
• explicit fallback chains
• configured default language
• automatic RTL for Arabic, Hebrew, Persian, Urdu, and related languages

Locale JSON is size-limited and rejects prototype-pollution keys. Recursive namespace collisions are resolved safely.

Views and runtime

<h1 data-t="dashboard.title">Dashboard</h1>
<input t:placeholder="search.placeholder" />

Text and translated attributes are resolved during SSR. Active/fallback messages are serialized safely for the language runtime, which rebinds data-t markers after client navigation.

Enable i18nPlugin() to use:

• <LanguageSwitcher />
• <LocaleStatus />

LanguageSwitcher renders a native select[data-wire-lang]. The packaged runtime validates the selection against the configured locales, writes the configured language cookie, updates the document lang/dir attributes, emits wrnexus:language-change, and reloads so the next SSR request uses the same cookie. No application-owned browser script is required.

Formatting

• formatNumber
• formatCurrency
• formatDate
• formatRelativeTime
• plural
• createLocaleFormatter
• translationCoverage Localization tooling can extract statically discoverable t("key"), i18n.t("key"), and data-i18n="key" usage, compare every locale with a reference, and create layout-stressing pseudo-locales:

import {
  auditLocaleKeys,
  createPseudoLocale,
  extractTranslationKeysFromFiles,
} from "@wrnexus/i18n";

const used = extractTranslationKeysFromFiles(sourceFiles);
const coverage = auditLocaleKeys(messages, "en");
const enXA = createPseudoLocale(messages.en);
const arXB = createPseudoLocale(messages.en, { rtl: true });

Pseudo-localization preserves interpolation placeholders and markup tags. RTL pseudo output uses Unicode direction controls, while runtime direction detection continues to derive rtl from Arabic and other RTL language subtags.