Following MIGRATION.md, I notice at least these differences from the kafkajs API which are not documented there. Feel free to close if you are not planning to implement a fully compatible API.

1. producer.on is absent (to register for producer events)
2. producer.events is absent (I'm using producer.events.CONNECT, producer.events.DISCONNECT, producer.events.REQUEST_TIMEOUT)
3. Partitioners export is absent (I'm using Partitioners.DefaultPartitioner)