The JavaScript code defines a MyClass class extending Node.js' EventEmitter to manage custom events. It has a method someMethod that emits an "alerts" event with the class state as argument. After instantiation, a timer is set to invoke someMethod after a delay, which triggers a console log in an event listener set up to listen for "alerts" events, demonstrating a basic event-driven programming setup.
import { EventEmitter } from "events";
const enum Events {
"alert" = "alerts",
"info" = "infos"
}
class MyClass extends EventEmitter {
private myClassState = { foo: "bar" };
constructor() {
super();
setTimeout(() => {
console.log("something happend that resulted in:");
this.someMethod();
});
}
public someMethod(): void {
this.emit(Events.alert, this.myClassState);
}
}
const c = new MyClass();
c.on(Events.alert, args => console.log("alert being triggeted", args));