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What's the original page that linked through to the callbackfunction that wasn't there?

is there a doc page for it? would be good to see some typescript examples

Does this help: <https://www.pulumi.com/docs/guides/crosswalk/aws/lambda/#register-an-event-handler-using-a-magic-lambda-function>

Unfortunately the docs are based on Terraform, and those mixins are added by Pulumi. The best source of info is the source code, I think.