ts-event-bus/build/Events.js

Distributed messaging in Typescript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.combineEvents = combineEvents;
exports.createEventBus = createEventBus;

var _Slot = require("./Slot");

var _Transport = require("./Transport");

// Explanation to how this type function: https://fettblog.eu/typescript-union-to-intersection/
// tl;dr Wrapping and unwrapping the generic into a fn force the unions to be an intersection
function combineEvents(...args) {
  const keys = args.reduce((acc, arg) => {
    acc.push.apply(acc, Object.keys(arg));
    return acc;
  }, []);
  const uniqKeys = [...new Set(keys)];

  if (keys.length > uniqKeys.length) {
    throw new Error('ts-event-bus: duplicate slots encountered in combineEvents.');
  }

  return Object.assign({}, ...args);
}

function createEventBus(args) {
  const transports = (args.channels || []).map(c => new _Transport.Transport(c, args.ignoredEvents));
  const eventBus = {};

  for (const event in args.events) {
    if (args.events.hasOwnProperty(event) && (!args.ignoredEvents || args.ignoredEvents && !args.ignoredEvents.includes(event))) {
      eventBus[event] = (0, _Slot.connectSlot)(event, transports, args.events[event].config);
    }
  }

  return eventBus;
}