in lib/event_handler.js [87:101]
offNext(eventName, callback) {
const nextHandlers = this.nextEventHandlers[eventName] || [];
if (callback) {
const index = nextHandlers.indexOf(callback);
if (index === -1) {
throw new Error(
`Could not turn off specified next event listener for "${eventName}": not found as a listener`,
);
}
nextHandlers.splice(index, 1);
} else {
delete this.nextEventHandlers[eventName];
}
return true;
}