No KafkaJS error type definitions

[trevorr]

Environment Information

• confluent-kafka-javascript version: 0.5.2

Steps to Reproduce

The migration docs mention using Kafka.isKafkaJSError for error handling, but this function is not present in the Typescript typings. None of the KafkaJSError classes are present either. I'm seeing KafkaJSProtocolError thrown in production with the message Broker: Unknown topic or partition, and I would like to handle that, but there doesn't seem to be a clean way to do that from Typescript.

[milindl]

The latest release contains these types

I'd recommending checking the code after making sure it's a KafkaJS error, for example

import { KafkaJS } from '@confluentinc/kafka-javascript';
...
// e is the thrown or caught error 
if (!KafkaJS.isKafkaJSError(e)) throw e;
const kErr = e as KafkaJS.KafkaJSError;
if (kErr.code === KafkaJS.ErrorCodes.ERR__TIMED_OUT /* or ERR_UNKNOWN_TOPIC_OR_PART etc. ERR__ indicate 'local' errors raised by the library and ERR_ indicate errors from the broker. */) { 
  /* ... */
}

The types for the error codes are present. You could look them up here too.

[trevorr]

Great, thanks! For anyone following along, this was fixed by #210.