# `Expresso.Extension`
[🔗](https://github.com/rellen/expresso/blob/main/lib/expresso/extension.ex#L1)

The Spark DSL extension

It gives the `deck` section, the `slide` entity and the entities of an element.
The transformers and the verifiers run for each deck module.
`Expresso.VerifierTransformer` runs the checks that give only errors, so an
error stops the compile. The verifiers give only warnings.

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*Consult [api-reference.md](api-reference.md) for complete listing*