Simple event bus

EventBus.js

const bus = {};

function on(event, callback) {
    const id = Symbol('');
    
    if (!bus[event]) bus[event] = {};
    
    bus[event][id] = callback;
    
    return {
        unsubscribe: () => {
            delete bus[event][id];
            
            if (Object.hasOwnProperty(bus[event])) {
                delete bus[event];
            }
        }
    }
}

function emmit(event, args) {
    if (!bus[event]) return;
    
    Object
        .keys(bus[event])
        .forEach(key => bus[event][key](args))
}

export {
    on,
    emmit
}