a998ef4550
Extract detectLocale() from hooks.server.ts into src/lib/server/locale.ts so it can be tested in isolation. Add 7 unit tests covering: - German, English, Spanish browser preferences - Fallback when primary language is unsupported - Quality value (q=) ordering - Fully unsupported language → null - Empty Accept-Language header → null Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
21 lines
612 B
TypeScript
21 lines
612 B
TypeScript
import { locales } from '$lib/paraglide/runtime';
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/**
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* Picks the best supported locale from an Accept-Language header value.
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* Returns null when no supported locale is found.
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*/
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export function detectLocale(acceptLanguage: string): string | null {
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const preferred = acceptLanguage
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.split(',')
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.map((part) => {
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const [lang, q] = part.trim().split(';q=');
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return { lang: lang.trim().split('-')[0].toLowerCase(), q: q ? parseFloat(q) : 1 };
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})
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.sort((a, b) => b.q - a.q);
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for (const { lang } of preferred) {
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if ((locales as readonly string[]).includes(lang)) return lang;
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}
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return null;
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}
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