formatMoney.ts

function formatMoney(value: any, thousandSeparator: string | false = false, fractionDigits = 2): string {
  let number = Number(value);
  if (isNaN(number)) {
    number = 0;
  }
  
  // Number#toFixed will throw runtime exception if fractionDigits isn't within 0-100 range
  if (fractionDigits < 0 || fractionDigits > 100) {
    fractionDigits = 0;
  }
  
  const [integer, fraction] = number.toFixed(fractionDigits + 1).slice(0, -1).split('.');
  const formattedInteger = thousandSeparator ? integer.replace(/\B(?=(\d{3})+(?!\d))/g, thousandSeparator) : integer;

  return formattedInteger + (fractionDigits > 0 ? '.' + fraction : '');
}