enum-helpers.ts

class EnumHelpers {
  /**
  * No instances guard.
  */
  private constructor() { }

  /**
  * Get all keys from enumeration.
  */
  public static keys(enumType: object) {
    const members = Object.keys(enumType);
    return members.filter(x => Number.isNaN(parseInt(x, 10))
  }
}