Function serializeDecimal

http/unstable_structured_fields.ts:1283–1313

(value: number)

}

function serializeDecimal(value: number): string {
  if (!Number.isFinite(value)) {
    throw new TypeError("Decimal must be finite");
  }

  // Round to MAX_DECIMAL_FRACTIONAL_DIGITS decimal places
  const scale = 10 ** MAX_DECIMAL_FRACTIONAL_DIGITS;
  const rounded = Math.round(value * scale) / scale;

  // Check integer part (max MAX_DECIMAL_INTEGER_DIGITS digits)
  const intPart = Math.trunc(Math.abs(rounded));
  if (intPart > MAX_DECIMAL_INTEGER_PART) {
    throw new TypeError("Decimal integer part too large");
  }

  // Format with MAX_DECIMAL_FRACTIONAL_DIGITS fractional digits
  const str = rounded.toFixed(MAX_DECIMAL_FRACTIONAL_DIGITS);

  // Remove trailing zeros but keep at least one digit after decimal
  let end = str.length;
  while (end > 0 && str[end - 1] === "0") {
    end--;
  }
  // Keep at least one digit after decimal point
  const dotIndex = str.indexOf(".");
  if (end <= dotIndex + 1) {
    end = dotIndex + 2;
  }

  return str.slice(0, end);
}

function serializeString(value: string): string {
  // Validate ASCII printable and check if escaping needed