import pubsub from "dead-simple/pubsub";
import eventEmitter from "dead-simple/eventEmitter";
// Alternatively:
// import { pubsub, eventEmitter } from 'dead-simple'

// === PubSub ======
const clicks = pubsub();

const unSub = clicks.sub((target) => console.log(`Clicked on ${target}!`));

clicks.pub("button");
// -> Clicked on button!

unSub();

clicks.pub("link");
// nothing

// === eventEmitter ===
// eventEmitter = named PubSub
const events = eventEmitter();

events.on("click", (target) => console.log(`Clicked on ${target}!`));

const unSubChange = events.on("change", (newValue) =>
  console.log(`Value is now ${newValue}!`)
);

events.emit("change", 1968);
// -> Value is now 1968!

unSubChange();

events.emit("change", 1968);
// nothing

events.emit("click", "button");
// -> Clicked on button!

export default (s = new Set()) => ({
  pub: (d) => s.forEach((f) => f(d)),
  sub: (f) => s.add(f).delete.bind(s, f),
});

export default (e) => (
  (e = new Map()),
  Object.freeze({
    on: (n, f) => (e.has(name) || e.set(n, p()), e.get(n).sub(f)),
    emit: (n, d) => e.has(n) && e.get(n).pub(d),
  })
);