Tiny Event Emitter

TinyEE.js

/**
 * TinyEE - A tiny event emitter using Map.
 */
class TinyEE {
  constructor() {
    // Where we will store the events
    this.events = new Map();
  }
  on(eventName, action) {
    if(typeof action !== 'function') {
      throw new Error(`Event ${eventName} must be a function, got ${typeof action}.`);
    }
    // Set the event with it's callback in the map
    this.events.set(eventName, action);
  }
  emit(eventName, ...args) {
    // Return the callback function so we can call it
    const event = this.events.get(eventName);
    if(typeof event !== 'function') {
        throw new Error(`Event ${eventName} doesn't exist.`);
    }
    // Call the function with the passed arguments
    eventToCall.apply(null, args);
  }
  remove(event) {
    // Remove the event from our Map, returns false if it doesn't exist
    return this.events.delete(event);
  }
}