diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71c864f..5bd3e34 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## 1.5.1 under development
 
-- no changes in this release.
+- Enh #172: Refactoring: extract root package configuration reader to separate class (@vjik)
 
 ## 1.5.0 December 25, 2023
 
diff --git a/src/Composer/MergePlanProcess.php b/src/Composer/MergePlanProcess.php
index a4ad495..97a5414 100644
--- a/src/Composer/MergePlanProcess.php
+++ b/src/Composer/MergePlanProcess.php
@@ -8,7 +8,6 @@
 use Composer\Package\PackageInterface;
 use Composer\Util\Filesystem;
 use Yiisoft\Config\MergePlan;
-use Yiisoft\Config\Options;
 use Yiisoft\VarDumper\VarDumper;
 
 use function file_get_contents;
diff --git a/src/Options.php b/src/Composer/Options.php
similarity index 98%
rename from src/Options.php
rename to src/Composer/Options.php
index 9c5bd88..906a438 100644
--- a/src/Options.php
+++ b/src/Composer/Options.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace Yiisoft\Config;
+namespace Yiisoft\Config\Composer;
 
 use function is_array;
 use function str_replace;
diff --git a/src/Composer/PackageFilesProcess.php b/src/Composer/PackageFilesProcess.php
index b4a7015..ef4e4a1 100644
--- a/src/Composer/PackageFilesProcess.php
+++ b/src/Composer/PackageFilesProcess.php
@@ -6,7 +6,6 @@
 
 use Composer\Composer;
 use Yiisoft\Config\ConfigPaths;
-use Yiisoft\Config\Options;
 
 use function glob;
 use function in_array;
diff --git a/src/Composer/ProcessHelper.php b/src/Composer/ProcessHelper.php
index 692baea..548c1e3 100644
--- a/src/Composer/ProcessHelper.php
+++ b/src/Composer/ProcessHelper.php
@@ -5,27 +5,24 @@
 namespace Yiisoft\Config\Composer;
 
 use Composer\Composer;
-use Composer\Factory;
 use Composer\Package\BasePackage;
 use Composer\Package\PackageInterface;
 use Yiisoft\Config\ConfigPaths;
-use Yiisoft\Config\Options;
 use Yiisoft\Strings\WildcardPattern;
 
-use function dirname;
 use function is_string;
-use function realpath;
 use function str_replace;
 
 /**
  * @internal
+ * @psalm-import-type PackageConfigurationType from RootConfiguration
+ * @psalm-import-type EnvironmentsConfigurationType from RootConfiguration
  */
 final class ProcessHelper
 {
     private Composer $composer;
     private ConfigPaths $paths;
-    private Options $rootPackageOptions;
-    private array $rootPackageExtra;
+    private RootConfiguration $rootConfiguration;
 
     /**
      * @psalm-var array<string, BasePackage>
@@ -38,27 +35,18 @@ final class ProcessHelper
     public function __construct(Composer $composer)
     {
         /** @psalm-suppress UnresolvableInclude, MixedOperand */
-        require_once $composer
-                ->getConfig()
-                ->get('vendor-dir') . '/autoload.php';
-        /** @psalm-suppress MixedArgument */
-        $rootPath = realpath(dirname(Factory::getComposerFile()));
+        require_once $composer->getConfig()->get('vendor-dir') . '/autoload.php';
 
-        $rootPackageExtra = $composer
-            ->getPackage()
-            ->getExtra();
-        /** @psalm-suppress UnresolvableInclude */
-        $this->rootPackageExtra = isset($rootPackageExtra['config-plugin-file'])
-            ? (array) (require "$rootPath/{$rootPackageExtra['config-plugin-file']}")
-            : $rootPackageExtra
-        ;
+        $this->rootConfiguration = RootConfiguration::fromComposerInstance($composer);
 
         $this->composer = $composer;
-        $this->rootPackageOptions = new Options($this->rootPackageExtra);
-        $this->paths = new ConfigPaths($rootPath, $this->rootPackageOptions->sourceDirectory());
+        $this->paths = new ConfigPaths(
+            $this->rootConfiguration->path(),
+            $this->rootConfiguration->options()->sourceDirectory(),
+        );
         $this->packages = (new PackagesListBuilder(
             $this->composer,
-            $this->rootPackageOptions->packageTypes()
+            $this->rootConfiguration->options()->packageTypes()
         ))->build();
     }
 
@@ -169,7 +157,7 @@ public function getPackageFilename(PackageInterface $package, Options $options,
      *
      * @return array The package configuration.
      *
-     * @psalm-return array<string, string|list<string>>
+     * @psalm-return PackageConfigurationType
      * @psalm-suppress MixedReturnTypeCoercion
      */
     public function getPackageConfig(PackageInterface $package): array
@@ -182,12 +170,11 @@ public function getPackageConfig(PackageInterface $package): array
      *
      * @return array The root package configuration.
      *
-     * @psalm-return array<string, string|list<string>>
-     * @psalm-suppress MixedReturnTypeCoercion
+     * @psalm-return PackageConfigurationType
      */
     public function getRootPackageConfig(): array
     {
-        return (array) ($this->rootPackageExtra['config-plugin'] ?? []);
+        return $this->rootConfiguration->packageConfiguration();
     }
 
     /**
@@ -195,12 +182,11 @@ public function getRootPackageConfig(): array
      *
      * @return array The environment configuration.
      *
-     * @psalm-return array<string, array<string, string|string[]>>
-     * @psalm-suppress MixedReturnTypeCoercion
+     * @psalm-return EnvironmentsConfigurationType
      */
     public function getEnvironmentConfig(): array
     {
-        return (array) ($this->rootPackageExtra['config-plugin-environments'] ?? []);
+        return $this->rootConfiguration->environmentsConfiguration();
     }
 
     /**
@@ -220,7 +206,7 @@ public function getPaths(): ConfigPaths
      */
     public function shouldBuildMergePlan(): bool
     {
-        return $this->rootPackageOptions->buildMergePlan();
+        return $this->rootConfiguration->options()->buildMergePlan();
     }
 
     /**
@@ -228,7 +214,7 @@ public function shouldBuildMergePlan(): bool
      */
     public function getMergePlanFile(): string
     {
-        return $this->rootPackageOptions->mergePlanFile();
+        return $this->rootConfiguration->options()->mergePlanFile();
     }
 
     /**
@@ -272,7 +258,7 @@ private function getPackageRootDirectoryPath(PackageInterface $package): string
      */
     private function isVendorOverridePackage(string $package): bool
     {
-        foreach ($this->rootPackageOptions->vendorOverrideLayerPackages() as $pattern) {
+        foreach ($this->rootConfiguration->options()->vendorOverrideLayerPackages() as $pattern) {
             if (!is_string($pattern)) {
                 continue;
             }
diff --git a/src/Composer/RootConfiguration.php b/src/Composer/RootConfiguration.php
new file mode 100644
index 0000000..384f6c4
--- /dev/null
+++ b/src/Composer/RootConfiguration.php
@@ -0,0 +1,93 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Config\Composer;
+
+use Composer\Composer;
+use Composer\Factory;
+
+/**
+ * @internal
+ * @psalm-type PackageConfigurationType = array<string, string|list<string>>
+ * @psalm-type EnvironmentsConfigurationType = array<string, array<string, string|string[]>>
+ */
+final class RootConfiguration
+{
+    private Options $options;
+
+    /**
+     * @psalm-var PackageConfigurationType
+     */
+    private array $packageConfiguration;
+
+    /**
+     * @psalm-var EnvironmentsConfigurationType
+     */
+    private array $environmentsConfiguration;
+
+    private function __construct(
+        private string $path,
+        array $composerExtra,
+    ) {
+        if (isset($composerExtra['config-plugin-file'])) {
+            /**
+             * @var array $extra
+             * @psalm-suppress UnresolvableInclude,MixedOperand
+             */
+            $extra = require $this->path . '/' . $composerExtra['config-plugin-file'];
+        } else {
+            $extra = $composerExtra;
+        }
+
+        $this->options = new Options($extra);
+
+        /** @psalm-var PackageConfigurationType */
+        $this->packageConfiguration = (array) ($extra['config-plugin'] ?? []);
+
+        /** @psalm-var EnvironmentsConfigurationType */
+        $this->environmentsConfiguration = $extra['config-plugin-environments'] ?? [];
+    }
+
+    public static function fromComposerInstance(Composer $composer): self
+    {
+        return new self(
+            realpath(dirname(Factory::getComposerFile())),
+            $composer->getPackage()->getExtra(),
+        );
+    }
+
+    public function path(): string
+    {
+        return $this->path;
+    }
+
+    public function options(): Options
+    {
+        return $this->options;
+    }
+
+    /**
+     * Returns the root package configuration.
+     *
+     * @return array The root package configuration.
+     *
+     * @psalm-return PackageConfigurationType
+     */
+    public function packageConfiguration(): array
+    {
+        return $this->packageConfiguration;
+    }
+
+    /**
+     * Returns the environments configuration.
+     *
+     * @return array The environments configuration.
+     *
+     * @psalm-return EnvironmentsConfigurationType
+     */
+    public function environmentsConfiguration(): array
+    {
+        return $this->environmentsConfiguration;
+    }
+}
diff --git a/src/Config.php b/src/Config.php
index e5ae683..bc0a8c0 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -6,6 +6,8 @@
 
 use ErrorException;
 
+use Yiisoft\Config\Composer\Options;
+
 use function extract;
 use function func_get_arg;
 use function restore_error_handler;
diff --git a/src/ConfigPaths.php b/src/ConfigPaths.php
index f9dd5e0..d5720fa 100644
--- a/src/ConfigPaths.php
+++ b/src/ConfigPaths.php
@@ -4,6 +4,8 @@
 
 namespace Yiisoft\Config;
 
+use Yiisoft\Config\Composer\Options;
+
 use function strlen;
 use function substr;
 use function trim;
diff --git a/src/FilesExtractor.php b/src/FilesExtractor.php
index a40be43..fefa33c 100644
--- a/src/FilesExtractor.php
+++ b/src/FilesExtractor.php
@@ -6,6 +6,8 @@
 
 use ErrorException;
 
+use Yiisoft\Config\Composer\Options;
+
 use function array_merge;
 use function glob;
 use function is_file;
diff --git a/src/MergePlan.php b/src/MergePlan.php
index f6d7ac1..bd6f848 100644
--- a/src/MergePlan.php
+++ b/src/MergePlan.php
@@ -4,6 +4,8 @@
 
 namespace Yiisoft\Config;
 
+use Yiisoft\Config\Composer\Options;
+
 /**
  * @internal
  */
diff --git a/tests/OptionsTest.php b/tests/Composer/OptionsTest.php
similarity index 97%
rename from tests/OptionsTest.php
rename to tests/Composer/OptionsTest.php
index 3dbe7a3..eae5578 100644
--- a/tests/OptionsTest.php
+++ b/tests/Composer/OptionsTest.php
@@ -2,10 +2,10 @@
 
 declare(strict_types=1);
 
-namespace Yiisoft\Config\Tests;
+namespace Yiisoft\Config\Tests\Composer;
 
 use PHPUnit\Framework\TestCase;
-use Yiisoft\Config\Options;
+use Yiisoft\Config\Composer\Options;
 
 final class OptionsTest extends TestCase
 {
diff --git a/tests/ConfigPaths/ConfigPathsTest.php b/tests/ConfigPaths/ConfigPathsTest.php
index 9802a55..0771875 100644
--- a/tests/ConfigPaths/ConfigPathsTest.php
+++ b/tests/ConfigPaths/ConfigPathsTest.php
@@ -6,7 +6,7 @@
 
 use PHPUnit\Framework\TestCase;
 use Yiisoft\Config\ConfigPaths;
-use Yiisoft\Config\Options;
+use Yiisoft\Config\Composer\Options;
 
 final class ConfigPathsTest extends TestCase
 {
diff --git a/tests/Integration/IntegrationTestCase.php b/tests/Integration/IntegrationTestCase.php
index 6d0ae51..2fbd893 100644
--- a/tests/Integration/IntegrationTestCase.php
+++ b/tests/Integration/IntegrationTestCase.php
@@ -13,7 +13,7 @@
 use Yiisoft\Config\Command\ConfigCommandProvider;
 use Yiisoft\Config\Config;
 use Yiisoft\Config\ConfigPaths;
-use Yiisoft\Config\Options;
+use Yiisoft\Config\Composer\Options;
 
 abstract class IntegrationTestCase extends TestCase
 {
diff --git a/tests/Integration/ProcessOnAutoloadDump/ProcessOnAutoloadDumpTest.php b/tests/Integration/ProcessOnAutoloadDump/ProcessOnAutoloadDumpTest.php
index a9150fe..98d1d2a 100644
--- a/tests/Integration/ProcessOnAutoloadDump/ProcessOnAutoloadDumpTest.php
+++ b/tests/Integration/ProcessOnAutoloadDump/ProcessOnAutoloadDumpTest.php
@@ -4,7 +4,7 @@
 
 namespace Yiisoft\Config\Tests\Integration\ProcessOnAutoloadDump;
 
-use Yiisoft\Config\Options;
+use Yiisoft\Config\Composer\Options;
 use Yiisoft\Config\Tests\Integration\IntegrationTestCase;
 
 final class ProcessOnAutoloadDumpTest extends IntegrationTestCase
diff --git a/tests/Integration/ProcessWithIgnoreAdditionalDefaultEnvironment/ProcessWithIgnoreAdditionalDefaultEnvironmentTest.php b/tests/Integration/ProcessWithIgnoreAdditionalDefaultEnvironment/ProcessWithIgnoreAdditionalDefaultEnvironmentTest.php
index ceddff1..9e016b2 100644
--- a/tests/Integration/ProcessWithIgnoreAdditionalDefaultEnvironment/ProcessWithIgnoreAdditionalDefaultEnvironmentTest.php
+++ b/tests/Integration/ProcessWithIgnoreAdditionalDefaultEnvironment/ProcessWithIgnoreAdditionalDefaultEnvironmentTest.php
@@ -4,7 +4,7 @@
 
 namespace Yiisoft\Config\Tests\Integration\ProcessWithIgnoreAdditionalDefaultEnvironment;
 
-use Yiisoft\Config\Options;
+use Yiisoft\Config\Composer\Options;
 use Yiisoft\Config\Tests\Integration\IntegrationTestCase;
 
 final class ProcessWithIgnoreAdditionalDefaultEnvironmentTest extends IntegrationTestCase
diff --git a/tests/Integration/ProcessWithoutMergePlanBuild/ProcessWithoutMergePlanBuildTest.php b/tests/Integration/ProcessWithoutMergePlanBuild/ProcessWithoutMergePlanBuildTest.php
index f92e6f5..4044b2b 100644
--- a/tests/Integration/ProcessWithoutMergePlanBuild/ProcessWithoutMergePlanBuildTest.php
+++ b/tests/Integration/ProcessWithoutMergePlanBuild/ProcessWithoutMergePlanBuildTest.php
@@ -4,7 +4,7 @@
 
 namespace Yiisoft\Config\Tests\Integration\ProcessWithoutMergePlanBuild;
 
-use Yiisoft\Config\Options;
+use Yiisoft\Config\Composer\Options;
 use Yiisoft\Config\Tests\Integration\IntegrationTestCase;
 
 final class ProcessWithoutMergePlanBuildTest extends IntegrationTestCase
diff --git a/tests/Integration/RebuildCommand/RebuildCommandTest.php b/tests/Integration/RebuildCommand/RebuildCommandTest.php
index d3abb8d..9a4a7f3 100644
--- a/tests/Integration/RebuildCommand/RebuildCommandTest.php
+++ b/tests/Integration/RebuildCommand/RebuildCommandTest.php
@@ -4,7 +4,7 @@
 
 namespace Yiisoft\Config\Tests\Integration\RebuildCommand;
 
-use Yiisoft\Config\Options;
+use Yiisoft\Config\Composer\Options;
 use Yiisoft\Config\Tests\Integration\IntegrationTestCase;
 
 final class RebuildCommandTest extends IntegrationTestCase