public-event-emitter

This package provides a wrapper around eventemitter3 that only exposes event handler addition and removal methods.

Install

# If you use npm
npm install --save-dev public-event-emitter

# If you use yarn
yarn add public-event-emitter

Usage

The main use case for PublicEventEmitter is to hide the emit() and other internal methods from the public interface of your class.

You can either inject an EventEmitter object manually if you want to use the PublicEventEmitter object directly or extend PublicEventEmitter in one of your own classes. In this case, the protected eventEmitter object will be available in your subclass.

import { EventEmitter } from "eventemitter3";
import { PublicEventEmitter } from "public-event-emitter";

interface MyEventMap {
  event1: (n: number) => void;
  event2: (s: string) => void;
  error: (error: Error) => void;
}

// Option 1: Manually create an event emitter object

const eventEmitter = new EventEmitter<MyEventMap>();
const publicEventEmitter = new PublicEventEmitter<MyEventMap>(eventEmitter);

publicEventEmitter.on("event1", (n) => console.log(n));
eventEmitter.emit("event1", 42);

// Option 2: Inherit from PublicEventEmitter

class MyClass extends PublicEventEmitter<MyEventMap> {
  public someMethod() {
    this.eventEmitter.emit("event1", 42);
  }
}

const o = new MyClass();

o.on("event1", (n) => console.log(n));
o.someMethod();

License

MIT