Custom Resources on LocalStack

LocalStack 63,725 's engine needs a resource provider for each type, and the 4.13.1 Community image has none for AWS 24 ::CloudFormation 24 ::CustomResource, to which it maps every Custom:: type; a comment in its source says the paid edition adds it. So the engine logs a warning, skips the resource and marks it complete:

What LocalStack 4.13.1 did with the custom resourceShell

docker logs l1-localstack 2>&1 | grep -o 'No resource provider found for "Custom::BookSeed"'
aws cloudformation describe-stack-resource --stack-name booknest-seed \
  --logical-resource-id SeedBooks --output text \
  --query 'StackResourceDetail.[ResourceType,ResourceStatus,PhysicalResourceId]'

Output

No resource provider found for "Custom::BookSeed"
Custom::BookSeed   CREATE_COMPLETE   unknown

Any type the image lacks succeeds this silently (SAM's Transform meets another), so read docker logs after a deploy that looks too easy. On AWS (not run here), the stack waits for the handler, and SeededCount reads 6. On this image, test a provider in two halves, as this section did: deploy it with the stack, then invoke it.

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