https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent.CustomEvent
$ npm install custom-event
var CustomEvent = require('custom-event');
// add an appropriate event listener
target.addEventListener('cat', function(e) { process(e.detail) });
// create and dispatch the event
var event = new CustomEvent('cat', {
detail: {
hazcheeseburger: true
}
});
target.dispatchEvent(event);