@formatjs/intl-displaynames/abstract/CanonicalCodeForDisplayNames.js

Polyfill for: https://tc39.es/proposal-intl-displaynames

import { CanonicalizeLocaleList, invariant, IsWellFormedCurrencyCode, } from '@formatjs/ecma402-abstract';
import { IsValidDateTimeFieldCode } from './IsValidDateTimeFieldCode';
var UNICODE_REGION_SUBTAG_REGEX = /^([a-z]{2}|[0-9]{3})$/i;
var ALPHA_4 = /^[a-z]{4}$/i;
var UNICODE_TYPE_REGEX = /^[a-z0-9]{3,8}([-_][a-z0-9]{3,8})*$/i;
function isUnicodeRegionSubtag(region) {
    return UNICODE_REGION_SUBTAG_REGEX.test(region);
}
function isUnicodeScriptSubtag(script) {
    return ALPHA_4.test(script);
}
function isUnicodeLocaleIdentifierType(code) {
    return UNICODE_TYPE_REGEX.test(code);
}
export function CanonicalCodeForDisplayNames(type, code) {
    if (type === 'language') {
        return CanonicalizeLocaleList([code])[0];
    }
    if (type === 'region') {
        if (!isUnicodeRegionSubtag(code)) {
            throw RangeError('invalid region');
        }
        return code.toUpperCase();
    }
    if (type === 'script') {
        if (!isUnicodeScriptSubtag(code)) {
            throw RangeError('invalid script');
        }
        return "".concat(code[0].toUpperCase()).concat(code.slice(1).toLowerCase());
    }
    if (type === 'calendar') {
        if (!isUnicodeLocaleIdentifierType(code)) {
            throw RangeError('invalid calendar');
        }
        return code.toLowerCase();
    }
    if (type === 'dateTimeField') {
        if (!IsValidDateTimeFieldCode(code)) {
            throw RangeError('invalid dateTimeField');
        }
        return code;
    }
    invariant(type === 'currency', 'invalid type');
    if (!IsWellFormedCurrencyCode(code)) {
        throw RangeError('invalid currency');
    }
    return code.toUpperCase();
}