This bundle allows you to log information that happens in your sistem. The logger can optionally output to console.log but later on, as your system grows, all of your instances should output to a centralised log management place. This is why we strongly recommend, as you're building your app, to use LoggerService instead of console.log

new LoggerBundle({
// This will just print the log to console as well
console: true,

If you want to use it:

const logger = container.get(LoggerService);
logger.info("User access forbidden");
// Add more context to your log
logger.info("User access forbidden", { route: "/123" }); // You can do anything you like to your context
// Some other type of logs
logger.warning("User access forbidden");
logger.error("User access forbidden");
logger.critical("User access forbidden");

The log object created looks like this:

export interface ILog {
message: string;
context: any;

If you want to listen to event and email all the critical ones:

import { Listener, On } from "@kaviar/core";
import { LogEvent, LogLevel } from "@kaviar/logger-bundle";
export class EmailCriticalLogs extends Listener {
constructor(protected readonly emailService: EmailService) {}
onLog(e: LogEvent) {
const log = e.data.log;
if (log.level === LogLevel.CRITICAL) {
// this.emailService.send()

And ofcourse don't forget to register you listener:

class AppBundle extends Bundle {
async prepare() {
// Warming up simply means instantiating and running init so it attaches events