# Structs
PreviewDiagnostic is a warning or error emitted during the execution of the preview.
PreviewDigest is a JSON-serializable overview of a preview operation.
PreviewStep is a detailed overview of a step the engine intends to take.
PropertyDiff contains information about the difference in a single property value.
# Type aliases
ResourceChanges contains the aggregate resource changes by operation type.
StepOp represents the kind of operation performed by a step.