on(event: 'error', handler: ErrorHandler<this>): void
on(event: 'online', handler: OnlineHandler<this>): void
on(event: 'exit', handler: ExitHandler<this>): void
on(event: 'error', handler: ErrorHandler<this>): void
on(event: 'online', handler: OnlineHandler<this>): void
on(event: 'exit', handler: ExitHandler<this>): void
worker.on('error', this.opts.errorHandler ?? (() => {}))
worker.on('online', this.opts.onlineHandler ?? (() => {}))
worker.on('error', this.opts.errorHandler ?? (() => {}))
worker.on('online', this.opts.onlineHandler ?? (() => {}))