From Zero To One: One refactoring later

ApiComponent.kt

fun api() : ApiComponent = ApiModule

interface ApiComponent {
  val okHttpClient: OkHttpClient
  val moshi: Moshi
  val catApi: CatApi
}

object ApiModule : ApiComponent {
  val loggingInterceptor = HttpLoggingInterceptor()
    .setLevel(HttpLoggingInterceptor.Level.BODY)

  override val okHttpClient = OkHttpClient.Builder()
    .addNetworkInterceptor(loggingInterceptor)
    .build()

  override val moshi = Moshi.Builder().build()

  val retrofit = Retrofit.Builder()
    .client(okHttpClient)
    .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
    .addConverterFactory(MoshiConverterFactory.create(moshi))
    .baseUrl("http://httpbin.org")
    .build()

  override val catApi = retrofit.create(CatApi::class.java)
}