in lib/event_handler.js [131:142]
dispatch(eventName, event) {
const handlers = [].concat(this.eventHandlers[eventName] || []);
for (const handler of handlers) {
handler(event);
}
const nextHandlers = [].concat(this.nextEventHandlers[eventName] || []);
for (const nextHandler of nextHandlers) {
nextHandler(event);
}
delete this.nextEventHandlers[eventName];
return true;
}