enum-txt-detect.ts

/**
* Check to numeral enumeration.
*/
private static isNumeral(enumType: object) {
  const members = Object.keys(enumType);
  if (!members.some((x) => true)) {
    throw new TypeError("Invalid enumeration type.");
  }

  let parsedCount = 0;
  members.forEach(x => {
    const parsedValue = parseInt(x, 10);
    if (!Number.isNaN(parsedValue)) {
      parsedCount++;
    }
  });
  return parsedCount === members.length / 2;
}

/**
 * Get all keys from enumeration.
 */
public static keys(enumType: object) {
  const members = Object.keys(enumType);
  if (!EnumHelpers.isNumeral(enumType)) {
    return members;
  }
 
  const keys: string[] = [];
  members.forEach(x => {
    const parsedValue = parseInt(x, 10);
    if (Number.isNaN(parsedValue)) {
      keys.push(x);
    }
  });
  return keys;
}