ash v1.47.12
ash

Ash.Api.Transformers.ValidateManyToManyJoinAttributes.transform

You're seeing just the function transform, go back to Ash.Api.Transformers.ValidateManyToManyJoinAttributes module for more information.
Link to this function

transform(api, dsl)

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Callback implementation for Ash.Dsl.Transformer.transform/2.