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Create a new project, write the code, publish it. Now the dependency is implemented and you can depend on it.

I'm assuming an Android project here, and "implement" meaning "declare". Then use something like:

val flavor1DebugImplementation by configurations.creating
dependencies {
    flavor1DebugImplementation("…")
}

See https://developer.android.com/build/dependencies:

However, if you want to add a dependency for a variant that combines a product flavor and a build type, then you must initialize the configuration name in the

configurations

block. The following sample adds a

runtimeOnly

dependency to your "freeDebug" build variant (using a local binary dependency).