57 lines
1.7 KiB
TypeScript
57 lines
1.7 KiB
TypeScript
import i18next, { type i18n as I18nInstance, type Resource } from 'i18next';
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import { initReactI18next } from 'react-i18next';
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import { resources } from './resources.js';
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import { DEFAULT_LOCALE, type SupportedLocale } from './types.js';
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export * from './detect.js';
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export * from './error-map.js';
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export * from './types.js';
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export interface InitI18nOptions {
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initialLocale: SupportedLocale;
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// Called whenever the active language changes.
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onLanguageChanged?: (locale: SupportedLocale) => void;
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}
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// Idempotent init — safe to call from multiple entry points.
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// Returns the configured i18next instance.
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export function initI18n(options: InitI18nOptions): I18nInstance {
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if (!i18next.isInitialized) {
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void i18next.use(initReactI18next).init({
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resources: resources as unknown as Resource,
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lng: options.initialLocale,
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fallbackLng: DEFAULT_LOCALE,
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defaultNS: 'common',
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ns: ['common', 'auth', 'errors', 'app'],
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interpolation: { escapeValue: false },
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returnNull: false,
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});
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} else if (i18next.language !== options.initialLocale) {
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void i18next.changeLanguage(options.initialLocale);
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}
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if (options.onLanguageChanged) {
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i18next.off('languageChanged');
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i18next.on('languageChanged', (lng: string) => {
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if (isSupportedLocale(lng)) {
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options.onLanguageChanged?.(lng);
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}
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});
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}
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return i18next;
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}
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export function changeLocale(locale: SupportedLocale): Promise<unknown> {
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return i18next.changeLanguage(locale);
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}
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export { i18next };
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// Local type guard (detect.ts exports this too; re-declared here to keep this
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// file free of cyclic references).
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function isSupportedLocale(value: string): value is SupportedLocale {
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return value === 'en' || value === 'de';
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}
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