elpatron
bd1edd89f3
Centralize UI language switches in cycleAppLanguage and document the event in plausible-events.md. Co-authored-by: Cursor <cursoragent@cursor.com>
40 lines
1.4 KiB
TypeScript
40 lines
1.4 KiB
TypeScript
import type { i18n as I18nInstance } from 'i18next'
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import { PlausibleEvents, trackPlausibleEvent } from '../services/analytics.js'
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/** Supported UI languages (ISO 639-1, language-only). */
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export const SUPPORTED_LANGUAGES = ['de', 'en', 'da', 'sv', 'nb'] as const
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export type AppLanguage = (typeof SUPPORTED_LANGUAGES)[number]
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export function normalizeAppLanguage(language?: string): AppLanguage {
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const base = (language ?? 'en').split('-')[0].toLowerCase()
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if ((SUPPORTED_LANGUAGES as readonly string[]).includes(base)) {
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return base as AppLanguage
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}
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return 'en'
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}
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export function getNextLanguage(current?: string): AppLanguage {
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const active = normalizeAppLanguage(current)
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const index = SUPPORTED_LANGUAGES.indexOf(active)
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return SUPPORTED_LANGUAGES[(index + 1) % SUPPORTED_LANGUAGES.length]
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}
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export function isGermanLocale(language?: string): boolean {
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return normalizeAppLanguage(language) === 'de'
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}
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/** Switch UI language and track explicit user choice (not auto-detection). */
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export function changeAppLanguage(i18n: I18nInstance, language: AppLanguage): void {
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const from = normalizeAppLanguage(i18n.language)
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const to = normalizeAppLanguage(language)
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if (from === to) return
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void i18n.changeLanguage(to)
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trackPlausibleEvent(PlausibleEvents.LANGUAGE_CHANGED, { from, to })
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}
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export function cycleAppLanguage(i18n: I18nInstance): void {
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changeAppLanguage(i18n, getNextLanguage(i18n.language))
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}
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