@surface/core/internal/event.js

Provides core functionality of many @surfaces modules.

export default class Event {
    listeners = new Set();
    subscribe(listener) {
        this.listeners.add(listener);
        return { unsubscribe: () => this.unsubscribe(listener) };
    }
    unsubscribe(listener) {
        if (!this.listeners.delete(listener)) {
            throw new Error("Listener not subscribed");
        }
    }
    notify(value) {
        for (const listener of this.listeners) {
            listener(value);
        }
    }
}