TypeScript round function with a default return value if the object provided is not defined or not a number

RoundOrDefault.ts

/**
 * Given an object with a property, it tests if the property is a number and returns the round of that
 * Otherwise returns the value provided by defaultValue, or null
 * @param obj The object that contains the property to test
 * @param prop The property that will be tested
 * @param decimalsToRound The number of decimals to round to
 * @param defaultValue The default value provided if it cannot complete the transaction
 */
export const roundOrDefault = (obj: any, prop: string, decimalsToRound: number, defaultValue = null) => {
  if (!obj) {
    return defaultValue;
  }
  if (obj && !obj.hasOwnProperty(prop)) {
    return defaultValue;
  }
  if (obj && obj.hasOwnProperty(prop)) {
    if (typeof obj[prop] !== 'number') {
      return defaultValue;
    } else {
      return Math.round(obj[prop] * 10 ** decimalsToRound) / 10 ** decimalsToRound;
    }
  }
};