How to use the trezor-connect.default.on function in trezor-connect

constructor (emit) {
    this.emit = emit
    this.devices = {}
    TrezorConnect.on('DEVICE_EVENT', e => {
      if (e.type === 'device-connect' || e.type === 'device-changed') {
        if (!this.devices[e.payload.path]) {
          this.devices[e.payload.path] = new Device(e.payload, this.emit)
        } else {
          this.devices[e.payload.path].update(e.payload)
        }
      } else if (e.type === 'device-disconnect') {
        if (this.devices[e.payload.path]) this.devices[e.payload.path].disconnect()
        delete this.devices[e.payload.path]
      }
    })
    TrezorConnect.on('UI_EVENT', e => {
      if (e.type === 'ui-request_pin') {
        const device = this.devices[e.payload.device.path]
        if (device) device.needPin()
      } else if (e.type === 'ui-request_passphrase') {
        console.log('Device needs passphrase')
      }
    })
    const manifest = { email: 'jordan@frame.sh', appUrl: 'https://frame.sh' }
    const config = { manifest, popup: false, webusb: false, debug: false, lazyLoad: false }
    try {
      TrezorConnect.init(config).then(() => {
        ready = true
        events.emit('ready')
      }).catch(err => console.warn('TrezorConnect Init Error', err))
    } catch (e) { console.warn(e) }
  }

constructor (emit) {
    this.emit = emit
    this.devices = {}
    TrezorConnect.on('DEVICE_EVENT', e => {
      if (e.type === 'device-connect' || e.type === 'device-changed') {
        if (!this.devices[e.payload.path]) {
          this.devices[e.payload.path] = new Device(e.payload, this.emit)
        } else {
          this.devices[e.payload.path].update(e.payload)
        }
      } else if (e.type === 'device-disconnect') {
        if (this.devices[e.payload.path]) this.devices[e.payload.path].disconnect()
        delete this.devices[e.payload.path]
      }
    })
    TrezorConnect.on('UI_EVENT', e => {
      if (e.type === 'ui-request_pin') {
        const device = this.devices[e.payload.device.path]
        if (device) device.needPin()
      } else if (e.type === 'ui-request_passphrase') {