How to use the wechaty.Contact.Type function in wechaty

* official contacts list
   */
  for (let i = 0; i < contactList.length; i++) {
    const contact = contactList[i]
    if (contact.type() === Contact.Type.Official) {
      log.info('Bot', `official ${i}: ${contact}`)
    }
  }

  /**
   *  personal contact list
   */

  for (let i = 0; i < contactList.length; i++) {
    const contact = contactList[i]
    if (contact.type() === Contact.Type.Personal) {
      log.info('Bot', `personal ${i}: ${contact.name()} : ${contact.id}`)
    }
  }

  const MAX = 17
  for (let i = 0; i < contactList.length; i++ ) {
    const contact = contactList[i]

    /**
     * Save avatar to file like: "1-name.jpg"
     */
    const file = await contact.avatar()
    const name = file.name
    await file.toFile(name, true)

    log.info('Bot', 'Contact: "%s" with avatar file: "%s"',