Class for adding event handling capability

class SomeClass extends Eventify<{ start: (node: Node) => boolean; }> {
    constructor() {
        super();
        setTimeout(() => {
            if (this.emit('start', document.body)) {
                console.log('yes');
            };
        }, 100);
    }
}

const sm = new SomeClass();
sm.on('start', (node) => {
    console.log(node);
    return true;
})