When the KafkaJS Consumer pulls messages from Kafka

[shyswy]

I want to know when the KafkaJS Consumer pulls messages from Kafka.
I assume that the KafkaJS Consumer will pull messages after committing them.
ex1) After 'Auto Commit' by commitOffsetsIfNecessary() (which depends on autoCommitInterval or autoCommitThreshold)
ex2) After 'Manual Commit' byconsumer.commitOffsets()

Am I right?
If not, please let me know the actual process of KafkaJS's Consuming.

[ari-github]

From what I saw in the code, it pulls new messages after committing the old one. However, if you choose manual, even though you commit, it will wait until the processing of the messages is finished.