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@broberg/i18n

v0.1.0

Published

Headless locale engine: a framework-free createI18n() with dot-path t() (fallback chain + {var} interpolation), a bilingual() helper for {da,en} content objects, localStorage persistence + navigator.language detection, an html[lang] sync, a pub/sub with n

Vulnerabilities

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Links

Git

Maintainers

cbrobergcbroberg

Keywords

i18ninternationalizationlocalizationlocaletranslationlanguage-switchheadlessbroberg

Readme

@broberg/i18n

A headless locale engine — the same ~120-line i18n core that trail, sanneandersen and xrt81 each hand-rolled, extracted once. Detect the locale, persist it, resolve a dot-path key with a fallback chain + {var} interpolation, and a bilingual() helper for {da,en} content objects. Framework-free, SSR-safe, and pnpm-hoist-safe. The LanguageSwitcher widget stays copy-owned per stack.

npm i @broberg/i18n

Usage

import { createI18n } from "@broberg/i18n";

const i18n = createI18n({
  locales: ["da", "en"],                // first = default
  fallbackLocale: "en",                 // the complete base dict
  messages: {
    da: { greeting: "Hej", nav: { home: "Hjem" } },
    en: { greeting: "Hello", nav: { home: "Home" }, welcome: "Hi {name}" },
  },
  storageKey: "acme-locale",
});

i18n.getLocale();                        // "da" (stored > navigator.language > default)
i18n.t("nav.home");                      // "Hjem"
i18n.t("welcome", { name: "Sanne" });    // "Hi Sanne"  (falls back to en, interpolates)
i18n.setLocale("en");                    // persists, syncs <html lang>, notifies subscribers
i18n.bilingual({ da: "Goddag", en: "Good day" });   // active-locale string, plain-string tolerant

const off = i18n.subscribe((locale) => rerender());  // pub/sub, no context provider

What it gets right

  • Fallback chain — t(key) resolves the active locale, then the fallback locale, then returns the raw key (never a blank string).
  • {var} interpolation — t("welcome", { name }) fills placeholders.
  • bilingual() — picks the active-locale field from a {da,en} object and tolerates a plain string, so LLM-generated bilingual content and legacy plain strings both work.
  • Detection — stored locale → navigator.language prefix-match → default, all SSR-guarded.
  • pnpm-hoist safe — a globalThis-keyed registry means two bundle copies with the same storageKey share one instance, so the active locale can never desync.

API

createI18n({ locales, defaultLocale?, fallbackLocale?, messages?, storageKey?, storage?, detect? }): I18n
// I18n: getLocale · setLocale · subscribe · t(key, vars?) · bilingual(text) · detectInitial · locales

Dictionaries stay in your repo (bundling them into the package would couple every consumer's copy) — the package ships only the engine. React (Next URL-prefix switch) and Preact (pub/sub) LanguageSwitcher adapters build on this core.

License

MIT · part of the @broberg/* shared inventory.