src/parse/roundNumber.js

/**
 * Round a number to a given level of precision.
 * @param {string|number} number - the number to round (can be a string)
 * @param {number} precision - the level of precision to which to round
 * (0 = whole number, 1 = one decimal, etc...)
 * @return {number} the rounded number
 */
export const roundNumber = (number, precision) => {
  if (number == null) return null;

  const factor = 10 ** precision;
  const adjustedNumber = parseFloat(number) * factor;

  if (number < 0) {
    return Math.ceil(adjustedNumber - 0.5) / factor;
  }

  return Math.round(adjustedNumber) / factor;
};