BlueWallet/events.js

function EV (eventName, arg) {
  if (Object.values(EV.enum).indexOf(eventName) === -1) {
    return console.warn('Unregistered event', eventName, 'registered events:', EV.enum)
  }
  EV.callbacks = EV.callbacks || {} // static variable
  EV.callbacks[eventName] = EV.callbacks[eventName] || []

  if (typeof arg !== 'function') { // then its an argument
    console.log('got event', eventName, '...')
    for (let cc of EV.callbacks[eventName]) {
      console.log('dispatching event', eventName)
      cc(arg)
    }
  } else { // its a callback. subscribe it to event
    console.log('someone subscribed to', eventName)
    EV.callbacks[eventName].push(arg)
  }
}

EV.enum = {
  WALLETS_COUNT_CHANGED: 'WALLETS_COUNT_CHANGED',
  TRANSACTIONS_COUNT_CHANGED: 'TRANSACTIONS_COUNT_CHANGED',
  CREATE_TRANSACTION_NEW_DESTINATION_ADDRESS: 'CREATE_TRANSACTION_NEW_DESTINATION_ADDRESS'
}

module.exports = EV