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If you are using 3rd party dependencies serialized callbackFunction does not work really good. I suggest to build the function as a separate package then use `pulumi.AssetsArchives` with `aws.lambda.Function['code']`

<https://www.pulumi.com/docs/concepts/inputs-outputs/assets-archives/>

then you end up with 2 step build but it is worth it.
callBackFunction gives a lot of headaches