@formatjs/ecma402-abstract/lib/CanonicalizeTimeZoneName.js

A collection of implementation for ECMAScript abstract operations

/**
 * https://tc39.es/ecma402/#sec-canonicalizetimezonename
 * @param tz
 */
export function CanonicalizeTimeZoneName(tz, _a) {
    var tzData = _a.tzData, uppercaseLinks = _a.uppercaseLinks;
    var uppercasedTz = tz.toUpperCase();
    var uppercasedZones = Object.keys(tzData).reduce(function (all, z) {
        all[z.toUpperCase()] = z;
        return all;
    }, {});
    var ianaTimeZone = uppercaseLinks[uppercasedTz] || uppercasedZones[uppercasedTz];
    if (ianaTimeZone === 'Etc/UTC' || ianaTimeZone === 'Etc/GMT') {
        return 'UTC';
    }
    return ianaTimeZone;
}