Chore: ensure that exported Construct have a defaultChild

[nmussy]

All construct should expose a defaultChild property (either by setting the node.defaultChild property, or by having a child named Default or Resource). If there are constructs where a defaultChild doesn't make sense(I can't find an example off the top of my head), a specific error type should be thrown.

Use Case

To avoid issues like #4455, #4188, #3314

Proposed Solution

This is something that might be handled by awslint

EDIT: I briefly tried looking into it, but couldn't find a way to do static analysis on function bodies with jsii-reflect. Am I missing something or is it not supported yet?

Other

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

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This is a 🚀 Feature Request

[nmussy]

A possible improvement to the defaultChild getter method would be to return the child if there is only one? This would cover most missing cases I imagine.