Make UnreferencedShape an opt-in linter instead #2119
Merged
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UnreferencedShape is no longer an on-by-default validator that ensures shapes must be connected to a service shape. There are plenty of cases where teams might create models that define shared shapes and don't necessarily connect those shapes to services. Emitting an UnreferencedShape validation event for these cases is harmless, but also annoying and desensitizing developers for when a shape is actually unreferenced.
This commit instead adds a new smithy-linters validator called UnreferencedShape that allows an optional "rootShapeSelector" to be provided that defines the "root" shapes that all other shape must be connected to. It defaults to "service". You might want to customize this to indicate that other shapes are your roots (e.g., maybe there is a specific trait that makes a shape a root).
Closes #2093
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