/**
 * This follows https://tc39.es/ecma402/#sec-case-sensitivity-and-case-mapping
 * @param str string to convert
 */
function toUpperCase(str) {
    return str.replace(/([a-z])/g, function (_, c) { return c.toUpperCase(); });
}
var NOT_A_Z_REGEX = /[^A-Z]/;
/**
 * https://tc39.es/ecma402/#sec-iswellformedcurrencycode
 */
export function IsWellFormedCurrencyCode(currency) {
    currency = toUpperCase(currency);
    if (currency.length !== 3) {
        return false;
    }
    if (NOT_A_Z_REGEX.test(currency)) {
        return false;
    }
    return true;
}