Merged Anvil contributions always count as used

[RBusarow]

in :lib:

@MergeModule(AppScope::class)
object NetworkModule {
  @Provides
  fun provideService() : Service = ...
}

in :app:

@MergeComponent(AppScope::class)
interface AppComponent { ... }

... and that's it. No other code.

The NetworkModule contribution will make :lib count as "used". It should count as unused, because nothing is actually consuming that binding.

Inspecting the Anvil graph already requires a sort of reverse look-up. Dependency modules are parsed for contributions for a given scope, then the dependent module is parsed looking for (sub)components of that scope. If the dependent module has a matching component.

It should go a step further. The component module should only "use" the contributing dependency module if the component module has a dependency which consumes the binding.

This gets ugly fast.

• In Dagger modules, the module's return types need to be parsed in order to get the bound types.
• When binding an impl to an interface type, then dependencies will typically be for the interface type.
• Replaced bindings?