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Yep, one of the challenges here is that KafkaJS requires Kafka 0.10+, which is true for several other popular clients. For this broker implementation to be somewhat practical, it would need to be extended to 0.10.0 at least. 0.8.0 was a nice, simple starting point for a “proof of concept” project like this.

might as well throw it into v86 or compile it to WASM too if you really want the big investment bucks

what are the advantages of having this design ?

None, but it's really cool to see it working.