@nwpr/pass-js/dist/lib/normalize-locale.js

Apple Wallet Pass generating and pushing updates from Node.js

/**
 * @see {@link https://stackoverflow.com/questions/8758340/regex-to-detect-locales}
 */
export function normalizeLocale(locale) {
    const match = /^(?<lang>[A-Za-z]{2,4})([-_](?<variant>[A-Za-z]{4}|\d{3}))?([-_](?<country>[A-Za-z]{2}|\d{3}))?$/.exec(locale);
    if (!match?.groups?.lang)
        throw new TypeError(`Invalid locale string: ${locale}`);
    let result = match.groups.lang.toLowerCase();
    if (match.groups.variant)
        result += `-${match.groups.variant
            .charAt(0)
            .toUpperCase()}${match.groups.variant.slice(1).toLowerCase()}`;
    if (match.groups.country)
        result += `-${match.groups.country.toUpperCase()}`;
    return result;
}
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