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CallbackFunction just inherits from aws.lambda.Function

the latter is the most 'raw' resource, where you control everything, and it maps directly to make an aws Lambda.

it allows you to pass along a javascript function, and takes care of many things for you

when yoy call `bucket.onEvent(..., () =&gt; { }, ... )`  then that just ends up calling into `new CallbackFunction` later on, passing along that javascript function.

but you can just instantiate it yourself to control things more.

I'm out for the night.  if you have more questions, let me know and i'll try to get back first thing tomorrow!