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What is the best layer to declare all the Hilt modules in a multi-module architecture? app module or domain?

by definition it would be impossible to declary any Hilt module in the domain layer

domain does not know about any other layer, so it is not able to provide any implementation and/or binding interfaces with classes

This might help. Look for *Frameworks and Drivers* section.
Hilt and Dagger are dependency injection frameworks.

<https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html>