code: func (c *Callbacks) OnCDOTAUserMsg_BoosterState(fn func(*dota.CDOTAUserMsg_BoosterState) error) {
  	c.onCDOTAUserMsg_BoosterState = append(c.onCDOTAUserMsg_BoosterState, fn)
  }
docs: // OnCDOTAUserMsg_BoosterState registers a callback for EDotaUserMessages_DOTA_UM_BoosterState