Fully typed Event Dispatcher for TypeScript

EventDistpacher.ts

type SquareEvent = { type: "square", x: number, y: number };
type CircleEvent = { type: "circle", radius: number };
type EventType = SquareEvent | CircleEvent;

type Events = {
    square: SquareEvent;
    circle: CircleEvent;
}

type ListenersMap = {
    [E in EventType as E['type']]?: (e: E) => void;
}

class EventDispatcher {
    private listenerMap: ListenersMap = {};

    dispatch(event: EventType): void {
        const listenerOfEvent = this.listenerMap[event.type];
        listenerOfEvent?.(event as any);
    }

    subscribe<TEventType extends keyof ListenersMap>(type: TEventType, listener: ListenersMap[TEventType]): void {
        this.listenerMap[type] = listener;
    }
}

const eventDispatcher = new EventDispatcher();

eventDispatcher.dispatch({type: "square", x: 1, y: 1})
eventDispatcher.subscribe("circle", (event) => {
    console.log(event);
})