buildSrc/src/main/java/com/uber/okbuck/core/model/base/Scope.java [279:415]:
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  private void extractConfiguration(Configuration configuration) {
    DependencyFactory factory = ProjectUtil.getDependencyFactory(project);

    ExternalDependenciesExtension externalDependenciesExtension =
        ProjectUtil.getExternalDependencyExtension(project);

    // Add raw dependency to dep cache. Used to resolved 3rdparty
    // dependencies when versionless is enabled.
    depCache.addDependencies(configuration.getAllDependencies());

    // TODO: Move to generic way which defines the first level dependencies
    // rather than collecting them from a global project which contains all.
    // Skip resolving gradle configurations which contains all dependencies
    // in the classpath to prevent doing un-needed work.
    if (externalDependenciesExtension.resoleOnlyThirdParty()
        && configuration.getName().toLowerCase().contains("classpath")) {
      return;
    }

    // Get first level project deps defined for the project's configuration
    Set<String> projectFirstLevel =
        configuration
            .getAllDependencies()
            .withType(ProjectDependency.class)
            .stream()
            .map(dependency -> dependency.getDependencyProject().getPath())
            .collect(Collectors.toSet());

    // Get first level external deps defined for the project's configuration
    Set<VersionlessDependency> externalFirstLevel =
        configuration
            .getAllDependencies()
            .withType(ExternalDependency.class)
            .stream()
            .map(factory::fromDependency)
            .flatMap(Collection::stream)
            .collect(Collectors.toSet());

    @Var Set<ResolvedDependency> allModuleDependencies = null;

    if (externalDependenciesExtension.versionedExportedDepsEnabled()) {
      ResolvedConfiguration resolvedConfiguration = configuration.getResolvedConfiguration();
      if (resolvedConfiguration.hasError()) {
        // Throw failure if there was one during resolution
        resolvedConfiguration.rethrowFailure();
      }

      Set<ResolvedDependency> firstLevelModuleDependencies =
          resolvedConfiguration.getLenientConfiguration().getFirstLevelModuleDependencies();
      allModuleDependencies =
          resolvedConfiguration.getLenientConfiguration().getAllModuleDependencies();

      // Infer first level project deps from the resolved graph and add to the projectFirstLevel
      // list. This can happen if there are resolution rules which substitute a direct external
      // dep with a project dep.
      Set<String> directProjectDeps =
          firstLevelModuleDependencies
              .stream()
              .map(DependencyUtils::filterProjectDeps)
              .flatMap(Collection::stream)
              .collect(Collectors.toSet());
      projectFirstLevel.addAll(directProjectDeps);

      // Infer transitive project deps of an external dependency from the resolved graph and add
      // to the projectFirstLevel list. This can happen if there are resolution rules which
      // substitute a transitive external dep with a project dep.
      Set<String> transitiveProjectDeps =
          allModuleDependencies
              .stream()
              .filter(DependencyUtils::isExternal)
              .map(ResolvedDependency::getChildren)
              .flatMap(Collection::stream)
              .distinct()
              .map(DependencyUtils::filterProjectDeps)
              .flatMap(Collection::stream)
              .collect(Collectors.toSet());
      projectFirstLevel.addAll(transitiveProjectDeps);

      Set<VersionlessDependency> firstLevelExternal =
          firstLevelModuleDependencies
              .stream()
              .map(DependencyFactory::fromDependency)
              .flatMap(Collection::stream)
              .collect(Collectors.toSet());
      externalFirstLevel.addAll(firstLevelExternal);
    }

    extractConfigurationImpl(configuration, projectFirstLevel, externalFirstLevel);

    if (externalDependenciesExtension.versionedExportedDepsEnabled()) {
      Preconditions.checkNotNull(allModuleDependencies);

      allModuleDependencies.forEach(
          rDep -> {
            // Get all child deps
            Set<OExternalDependency> childEDeps =
                DependencyFactory.childrenFromDependency(rDep)
                    .stream()
                    .map(allExternal::get)
                    .filter(Objects::nonNull)
                    .collect(Collectors.toSet());

            // Update all matching external deps with this child deps
            DependencyFactory.fromDependency(rDep)
                .stream()
                .map(allExternal::get)
                .filter(Objects::nonNull)
                .forEach(eDep -> eDep.addDeps(childEDeps));

            // Add all child deps as first level deps if there are no self artifacts;
            if (rDep.getModuleArtifacts().size() == 0) {
              childEDeps.forEach(i -> firstLevelExternal.put(i.getVersionless(), i));
            }
          });

      // Add exclude rule to the external dependency.
      configuration
          .getAllDependencies()
          .stream()
          .filter(dependency -> dependency instanceof ExternalDependency)
          .map(dependency -> (ExternalDependency) dependency)
          .forEach(
              dependency -> {
                Set<VersionlessDependency> vDeps = factory.fromDependency(dependency);
                vDeps.forEach(
                    vDep -> {
                      OExternalDependency eDep = allExternal.getOrDefault(vDep, null);
                      if (eDep != null) {
                        eDep.addExcludeRules(dependency.getExcludeRules());
                      }
                    });
              });
    }

    // Mark first level external deps as same in the object
    firstLevelExternal.values().forEach(external -> external.updateFirstLevel(true));
  }
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plugin/src/main/java/com/uber/okbuck/core/model/base/Scope.java [279:415]:
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  private void extractConfiguration(Configuration configuration) {
    DependencyFactory factory = ProjectUtil.getDependencyFactory(project);

    ExternalDependenciesExtension externalDependenciesExtension =
        ProjectUtil.getExternalDependencyExtension(project);

    // Add raw dependency to dep cache. Used to resolved 3rdparty
    // dependencies when versionless is enabled.
    depCache.addDependencies(configuration.getAllDependencies());

    // TODO: Move to generic way which defines the first level dependencies
    // rather than collecting them from a global project which contains all.
    // Skip resolving gradle configurations which contains all dependencies
    // in the classpath to prevent doing un-needed work.
    if (externalDependenciesExtension.resoleOnlyThirdParty()
        && configuration.getName().toLowerCase().contains("classpath")) {
      return;
    }

    // Get first level project deps defined for the project's configuration
    Set<String> projectFirstLevel =
        configuration
            .getAllDependencies()
            .withType(ProjectDependency.class)
            .stream()
            .map(dependency -> dependency.getDependencyProject().getPath())
            .collect(Collectors.toSet());

    // Get first level external deps defined for the project's configuration
    Set<VersionlessDependency> externalFirstLevel =
        configuration
            .getAllDependencies()
            .withType(ExternalDependency.class)
            .stream()
            .map(factory::fromDependency)
            .flatMap(Collection::stream)
            .collect(Collectors.toSet());

    @Var Set<ResolvedDependency> allModuleDependencies = null;

    if (externalDependenciesExtension.versionedExportedDepsEnabled()) {
      ResolvedConfiguration resolvedConfiguration = configuration.getResolvedConfiguration();
      if (resolvedConfiguration.hasError()) {
        // Throw failure if there was one during resolution
        resolvedConfiguration.rethrowFailure();
      }

      Set<ResolvedDependency> firstLevelModuleDependencies =
          resolvedConfiguration.getLenientConfiguration().getFirstLevelModuleDependencies();
      allModuleDependencies =
          resolvedConfiguration.getLenientConfiguration().getAllModuleDependencies();

      // Infer first level project deps from the resolved graph and add to the projectFirstLevel
      // list. This can happen if there are resolution rules which substitute a direct external
      // dep with a project dep.
      Set<String> directProjectDeps =
          firstLevelModuleDependencies
              .stream()
              .map(DependencyUtils::filterProjectDeps)
              .flatMap(Collection::stream)
              .collect(Collectors.toSet());
      projectFirstLevel.addAll(directProjectDeps);

      // Infer transitive project deps of an external dependency from the resolved graph and add
      // to the projectFirstLevel list. This can happen if there are resolution rules which
      // substitute a transitive external dep with a project dep.
      Set<String> transitiveProjectDeps =
          allModuleDependencies
              .stream()
              .filter(DependencyUtils::isExternal)
              .map(ResolvedDependency::getChildren)
              .flatMap(Collection::stream)
              .distinct()
              .map(DependencyUtils::filterProjectDeps)
              .flatMap(Collection::stream)
              .collect(Collectors.toSet());
      projectFirstLevel.addAll(transitiveProjectDeps);

      Set<VersionlessDependency> firstLevelExternal =
          firstLevelModuleDependencies
              .stream()
              .map(DependencyFactory::fromDependency)
              .flatMap(Collection::stream)
              .collect(Collectors.toSet());
      externalFirstLevel.addAll(firstLevelExternal);
    }

    extractConfigurationImpl(configuration, projectFirstLevel, externalFirstLevel);

    if (externalDependenciesExtension.versionedExportedDepsEnabled()) {
      Preconditions.checkNotNull(allModuleDependencies);

      allModuleDependencies.forEach(
          rDep -> {
            // Get all child deps
            Set<OExternalDependency> childEDeps =
                DependencyFactory.childrenFromDependency(rDep)
                    .stream()
                    .map(allExternal::get)
                    .filter(Objects::nonNull)
                    .collect(Collectors.toSet());

            // Update all matching external deps with this child deps
            DependencyFactory.fromDependency(rDep)
                .stream()
                .map(allExternal::get)
                .filter(Objects::nonNull)
                .forEach(eDep -> eDep.addDeps(childEDeps));

            // Add all child deps as first level deps if there are no self artifacts;
            if (rDep.getModuleArtifacts().size() == 0) {
              childEDeps.forEach(i -> firstLevelExternal.put(i.getVersionless(), i));
            }
          });

      // Add exclude rule to the external dependency.
      configuration
          .getAllDependencies()
          .stream()
          .filter(dependency -> dependency instanceof ExternalDependency)
          .map(dependency -> (ExternalDependency) dependency)
          .forEach(
              dependency -> {
                Set<VersionlessDependency> vDeps = factory.fromDependency(dependency);
                vDeps.forEach(
                    vDep -> {
                      OExternalDependency eDep = allExternal.getOrDefault(vDep, null);
                      if (eDep != null) {
                        eDep.addExcludeRules(dependency.getExcludeRules());
                      }
                    });
              });
    }

    // Mark first level external deps as same in the object
    firstLevelExternal.values().forEach(external -> external.updateFirstLevel(true));
  }
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