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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | 2x 6x 6x 5x 5x 10x 4x 4x 10x 1x 1x 1x 1x | /**
* Get browser/nodejs language
*
* @returns BCP 47 tags of the browser/nodejs language
*/
export function detectLang(): string;
/**
* Get browser/nodejs language that matches the given language tags
*
* @param langs The language tags to match (BCP 47 tags and sub-tags are supported)
* @returns The first language tag that matches the browser/nodejs language, or `null` if no match
*
* @example
* ```js
* detectLang(["en", "zh-CN"]) || "zh-TW"
* ```
*/
export function detectLang<T extends string>(langs: readonly T[]): T | null;
export function detectLang(langs: readonly string[]): string | null;
export function detectLang(langs?: readonly string[]): string | null {
const locale = Intl.DateTimeFormat().resolvedOptions().locale;
if (langs) {
// BCP 47 tags are case-insensitive
const lowerCaseLocale = locale.toLowerCase();
for (const lang of langs) {
if (lowerCaseLocale.startsWith(lang.toLowerCase())) {
return lang;
}
}
return null;
}
return locale;
}
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