Must Be Api

Dependencies are considered to be part of a module's public "ABI" if that module exposes some aspect of the dependency in its own API.

For instance, if a :moduleA extends a class/interface from :moduleB, or takes a type from :moduleB as a function parameter, then any consumer of :moduleA's API must also have a dependency upon :moduleB. In scenarios like this, the dependency module(s) should be declared using Gradle's api configuration.