Function numberToString

src/compute-engine/numerics/strings.ts:133–170

(
  num: number | bigint,
  fractionalDigits?: number | string
)

  for (let i = roman.length - 1; i >= 0; i--) {
    const currentValue = romanMap[roman[i]];
    if (currentValue === undefined) return [total, roman.slice(i)];

    if (currentValue < prevValue) total -= currentValue;
    else total += currentValue;

    prevValue = currentValue;
  }

  return [total, ''];
}

export function fromDigits(
  s: string,
  baseInput?: string | number
): [result: number, rest: string] {
  s = s.trim();
  if (s.length === 0) return [NaN, ''];
  if (s.startsWith('+')) return fromDigits(s.slice(1), baseInput);
  if (s.startsWith('-')) {
    const [v, r] = fromDigits(s.slice(1), baseInput);
    return [-v, r];
  }
  let base = 10;
  if (typeof baseInput === 'string') baseInput = baseInput.toLowerCase();
  if (s.startsWith('0x')) {
    base = 16;
    s = s.slice(2);
  } else if (s.startsWith('0b')) {
    base = 2;
    s = s.slice(2);
  } else if (baseInput === 'roman') {
    return fromRoman(s);
  } else if (baseInput === 'base64' || baseInput === 'base-64') {
    try {
      return [parseInt(btoa(s)), ''];
    } catch {
      return [NaN, ''];
    }
  } else if (typeof baseInput === 'number') {
    base = baseInput;