58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
import { computed } from 'vue';
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import { useI18n } from 'vue-i18n';
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/**
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* Composable for locale resolution and validation
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* Provides a normalized, validated locale that works with Intl APIs
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*/
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export function useLocale() {
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const { locale } = useI18n();
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/**
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* Resolves and validates the current locale for use with Intl APIs
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*
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* Handles multiple fallback scenarios:
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* 1. Normalizes underscore-based tags (pt_BR → pt-BR, zh_CN → zh-CN)
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* 2. Falls back to base language if specific locale unsupported (pt-BR → pt)
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* 3. Falls back to English if base language unsupported (xx-YY → en)
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*
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* @returns {string} Valid BCP 47 locale tag for Intl APIs
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*
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* @example
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* const { resolvedLocale } = useLocale();
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* new Intl.NumberFormat(resolvedLocale.value).format(1234);
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* new Intl.DateTimeFormat(resolvedLocale.value).format(new Date());
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*/
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const resolvedLocale = computed(() => {
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// Handle null/undefined locale
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if (!locale.value) return 'en';
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// Normalize underscore to hyphen (pt_BR → pt-BR, zh_CN → zh-CN)
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const normalized = locale.value.replace(/_/g, '-');
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// Check if the specific locale is supported (e.g., pt-BR, zh-CN)
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const supportedLocales = Intl.NumberFormat.supportedLocalesOf([normalized]);
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if (supportedLocales.length > 0) {
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return normalized;
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}
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// If specific locale not supported, try base language (pt-BR → pt, zh-CN → zh)
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const baseLocale = normalized.split('-')[0];
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const baseSupportedLocales = Intl.NumberFormat.supportedLocalesOf([
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baseLocale,
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]);
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if (baseSupportedLocales.length > 0) {
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return baseLocale;
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}
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// If base language also not supported, fall back to English
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return 'en';
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});
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return {
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resolvedLocale,
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// Also expose the raw locale for cases where you need it
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locale,
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};
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}
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