How to use the wechaty.log.info function in wechaty

function onScan (qrcode: string, status: ScanStatus) {
  generate(qrcode)  // show qrcode on console

  const qrcodeImageUrl = [
    'https://api.qrserver.com/v1/create-qr-code/?data=',
    encodeURIComponent(qrcode),
  ].join('')

  log.info('StarterBot', '%s(%s) - %s', ScanStatus[status], status, qrcodeImageUrl)
}

function doExit(code: number): void {
  log.info('Bot', 'doExit(%d)', code)
  if (killChrome) {
    killChrome('SIGINT')
  }
  process.exit(code)
}

async function manageDingRoom() {
  log.info('Bot', 'manageDingRoom()')

  /**
   * Find Room
   */
  try {
    const room = await bot.Room.find({ topic: /^ding/i })
    if (!room) {
      log.warn('Bot', 'there is no room topic ding(yet)')
      return
    }
    log.info('Bot', 'start monitor "ding" room join/leave/topic event')

    /**
     * Event: Join
     */
    room.on('join', function(inviteeList, inviter) {
      log.verbose('Bot', 'Room EVENT: join - "%s", "%s"',
                         inviteeList.map(c => c.name()).join(', '),
                         inviter.name(),
      )
      console.log('room.on(join) id:', this.id)
      checkRoomJoin.call(this, room, inviteeList, inviter)
    })

    /**
     * Event: Leave
     */

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"',
                    contact.name(),
                    name,
            )

    if (i > MAX) {
      log.info('Bot', 'Contacts too many, I only show you the first %d ... ', MAX)
      break
    }
  }

  const SLEEP = 7
  log.info('Bot', 'I will re-dump contact weixin id & names after %d second... ', SLEEP)
  setTimeout(main, SLEEP * 1000)

}

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"',
                    contact.name(),
                    name,
            )

    if (i > MAX) {
      log.info('Bot', 'Contacts too many, I only show you the first %d ... ', MAX)
      break
    }
  }

  const SLEEP = 7
  log.info('Bot', 'I will re-dump contact weixin id & names after %d second... ', SLEEP)
  setTimeout(main, SLEEP * 1000)

}

async function getOutRoom(contact, room) {
  log.info('Bot', 'getOutRoom("%s", "%s")', contact, room)

  try {
    await room.say('You said "ding" in my room, I will remove you out.')
    await room.del(contact)
  } catch (e) {
    log.error('Bot', 'getOutRoom() exception: ' + e.stack)
  }
}

async function createDingRoom(contact) {
  log.info('Bot', 'createDingRoom("%s")', contact)

  try {
    const helperContact = await getHelperContact()

    if (!helperContact) {
      log.warn('Bot', 'getHelperContact() found nobody')
      await contact.say(`You don't have a friend called "${HELPER_CONTACT_NAME}",
                         because create a new room at least need 3 contacts, please set [HELPER_CONTACT_NAME] in the code first!`)
      return
    }

    log.info('Bot', 'getHelperContact() ok. got: "%s"', helperContact.name())

    const contactList = [contact, helperContact]
    log.verbose('Bot', 'contactList: "%s"', contactList.join(','))

    await contact.say(`There isn't ding room. I'm trying to create a room with "${helperContact.name()}" and you`)
    const room = await bot.Room.create(contactList, 'ding')
    log.info('Bot', 'createDingRoom() new ding room created: "%s"', room)

    await room.topic('ding - created')
    await room.say('ding - created')

    return room

  } catch (e) {
    log.error('Bot', 'getHelperContact() exception:', e.stack)
    throw e

  .then(() => log.info('StarterBot', 'Starter Bot Started.'))
  .catch(e => log.error('StarterBot', e))

function onLogin (user: Contact) {
  log.info('StarterBot', '%s login', user)
}

async function main() {
  const contactList = await bot.Contact.findAll()

  log.info('Bot', '#######################')
  log.info('Bot', 'Contact number: %d\n', contactList.length)

  /**
   * 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
   */