How to use the wechaty.config.default function in wechaty

Wechaty,
  Message,
}           from 'wechaty'

// log.level = 'verbose'
// log.level = 'silly'

/**
 *
 * `7217d7bce18c4bcfbe04ba7bdfaf9c08` for Wechaty demo
 *
 */
const APIAI_API_KEY = '7217d7bce18c4bcfbe04ba7bdfaf9c08'
const brainApiAi = ApiAi(APIAI_API_KEY)

const bot = Wechaty.instance({ profile: config.default.DEFAULT_PROFILE })

console.log(`
Welcome to api.AI Wechaty Bot.
Api.AI Doc: https://docs.api.ai/v16/docs/get-started

Notice: This bot will only active in the room which name contains 'wechaty'.
/* if (m.room() && /Wechaty/i.test(m.room().name())) { */

Loading... please wait for QrCode Image Url and then scan to login.
`)

bot
.on('scan', (qrcode, status) => {
  QrcodeTerminal.generate(qrcode)
  console.log(`${qrcode}\n[${status}] Scan QR Code in above url to login: `)
})

/* tslint:disable:variable-name */
const qrcodeTerminal = require('qrcode-terminal')

/**
 * Change `import { ... } from '../'`
 * to     `import { ... } from 'wechaty'`
 * when you are runing with Docker or NPM instead of Git Source.
 */
import {
  config,
  Message,
  Wechaty,
}                 from 'wechaty'

const bot = Wechaty.instance({ profile: config.default.DEFAULT_PROFILE })

bot
.on('scan', (qrcode, status) => {
  qrcodeTerminal.generate(qrcode)
  console.log(`${qrcode}\n[${status}] Scan QR Code in above url to login: `)
})
.on('login'	  , user => console.log(`${user} logined`))
.on('message', async function(msg) {
  console.log(`RECV: ${msg}`)

  if (msg.type() !== Message.Type.Audio) {
    return // skip no-VOICE message
  }

  // const mp3Stream = await msg.readyStream()

3. Recongenize Verify Message

If you send friend request to me,
with a verify message 'ding',
I will accept your request automaticaly!
__________________________________________________

Hope you like it, and you are very welcome to
upgrade me for more super powers!

Please wait... I'm trying to login in...

`

console.log(welcome)
const bot = Wechaty.instance({ profile: config.default.DEFAULT_PROFILE })

bot
.on('login'	  , user => log.info('Bot', `${user.name()} logined`))
.on('logout'	, user => log.info('Bot', `${user.name()} logouted`))
.on('error'   , e => log.info('Bot', 'error: %s', e))
.on('scan', (qrcode, status) => {
  qrTerm.generate(qrcode)
  console.log(`${qrcode}\n[${status}] Scan QR Code in above url to login: `)
})
/**
 *
 * Wechaty Event: `friend`
 *
 */
.on('friendship', async friendship => {
  let logMsg

4. Change room topic
5. Monitor room events
6. etc...

If you send a message of magic word 'ding',
you will get a invitation to join my own room!
__________________________________________________

Hope you like it, and you are very welcome to
upgrade me for more super powers!

Please wait... I'm trying to login in...

`
console.log(welcome)
const bot = Wechaty.instance({ profile: config.default.DEFAULT_PROFILE })

bot
.on('scan', (qrcode, status) => {
  qrTerm.generate(qrcode, { small: true })
  console.log(`${qrcode}\n[${status}] Scan QR Code in above url to login: `)
})
.on('logout'	, user => log.info('Bot', `"${user.name()}" logouted`))
.on('error'   , e => log.info('Bot', 'error: %s', e))

/**
 * Global Event: login
 *
 * do initialization inside this event.
 * (better to set a timeout, for browser need time to download other data)
 */
.on('login', async function(user) {

}           = require('wechaty')

const { onMessage }      = require('./on-message')
const { onFriendship }   = require('./on-friend')
const { onRoomJoin }     = require('./on-room-join')

const welcome = `
=============== Powered by Wechaty ===============
-------- https://github.com/Chatie/wechaty --------

Please wait... I'm trying to login in...

`
console.info(welcome)

const bot = Wechaty.instance({ profile: config.default.DEFAULT_PROFILE })

bot
  .on('scan', (qrcode, status) => {
    require('qrcode-terminal').generate(qrcode)
    console.info(`${qrcode}\n[${status}] Scan QR Code in above url to login: `)
  })

  .on('login', async function (user) {
    log.info('Bot', `${user.name()} logined`)
    await this.say(`wechaty logined`)
  })

  .on('logout',     user => log.info('Bot', `${user.name()} logouted`))
  .on('error',      error => log.info('Bot', 'error: %s', error))

  .on('message',    onMessage)