promiseSignals.js

function triggerSignal (services) {
  // One signal
  services.signals.triggerSignal('newItemTitleChanged', {
    title: 'hey'
  })
  .then(function () {
    console.log('I resolved!');
  })
  // multiple signals
  Promise.all([
    services.signals.triggerSignal('newItemTitleChanged', {
      title: 'hey'
    }),
    services.signals.triggerSignal('newItemTitleChanged', {
      title: 'hopp'
    })
  ])
  .then(function () {
    console.log('I resolved')
  })
}

// Create a module
export default (module, controller) => {
  const promises = {}

  controller.on('signalEnd', ({options}) => {
    if (promises[options.promiseId]) {
      promises[options.promiseId].resolve();
      delete promises[options.promiseId];
    }
  })
  controller.on('signalError', ({options}) => {
    if (promises[options.promiseId]) {
      promises[options.promiseId].reject();
      delete promises[options.promiseId];
    }
  })
  module.addServices({
    triggerSignal(signal, payload) {
      return new Promise((resolve, reject) => {
        const id = Date.now().toString()
        promises[id] = {
          resolve: resolve,
          reject: reject
        }
        controller.getSignals(signal)(payload || {},  {
          promiseId: id
        })
      })
    }
  })
}