EventEmitterMiddleware allows your Redux actions to emit events to an external event emitter

eventEmitterMiddleware.js

/**
 * A Redux middleware that externally emits events from actions.
 * @param {EventEmitter} emitter - emits events
 * @returns {Function} a Redux middleware
 */
export const eventEmitterMiddleware = (emitter) => {
  if (!emitter) {
    throw new Error('Cannot emit events. No EventEmitter provided.')
  }

  return store => next => action => {
    const result = next(action)
    if (!!action.meta && !!action.meta.event) {
      try {
        action.meta.event(emitter.emit.bind(emitter))
      } catch (e) {
        console.error(e)
      }
    }
    return result
  }
}