diff --git a/composer.json b/composer.json
index ee37c00..84b1400 100644
--- a/composer.json
+++ b/composer.json
@@ -32,7 +32,8 @@
       "dbschemix\\core\\": "src"
     },
     "files": [
-      "src/internal/filesystem/functions.php"
+      "src/internal/filesystem/functions.php",
+      "src/internal/functions.php"
     ]
   },
   "autoload-dev": {
diff --git a/src/internal/action/Command.php b/src/command/Command.php
similarity index 95%
rename from src/internal/action/Command.php
rename to src/command/Command.php
index 0c6fcea..1c75033 100644
--- a/src/internal/action/Command.php
+++ b/src/command/Command.php
@@ -2,18 +2,16 @@
 
 declare(strict_types=1);
 
-namespace dbschemix\core\internal\action;
+namespace dbschemix\core\command;
 
 use Override;
 use Throwable;
-use dbschemix\core\command\CommandInterface;
-use dbschemix\core\command\Options;
 use dbschemix\core\connection\ConnectionInterface;
 use dbschemix\core\Config;
 use dbschemix\core\Context;
 
 /**
- * @psalm-internal dbschemix\core
+ * @psalm-internal dbschemix
  */
 final readonly class Command implements CommandInterface
 {
diff --git a/src/internal/functions.php b/src/internal/functions.php
new file mode 100644
index 0000000..57b5c0b
--- /dev/null
+++ b/src/internal/functions.php
@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+namespace dbschemix\core\internal;
+
+use OutOfBoundsException;
+use Composer\InstalledVersions;
+
+/**
+ * @api
+ * @param non-empty-string $package
+ * @return non-empty-string
+ * @throws OutOfBoundsException of package is not installed
+ */
+function get_package_version(string $package): string
+{
+    /**
+     * @var array<non-empty-string, non-empty-string> $versions
+     */
+    static $versions = [];
+    if (isset($versions[$package])) {
+        return $versions[$package];
+    }
+
+    if (InstalledVersions::isInstalled($package)) {
+        $version = InstalledVersions::getPrettyVersion($package);
+
+        if ($version !== null) {
+            assert($version !== '');
+
+            return $versions[$package] = $version;
+        }
+    }
+
+    throw new OutOfBoundsException("Package `$package` is not installed.");
+}
+
+/**
+ * @api
+ * @param non-empty-string $package
+ * @return non-empty-string
+ * @throws OutOfBoundsException of package is not installed
+ */
+function get_package_path(string $package): string
+{
+    $packagePath = InstalledVersions::getInstallPath($package);
+
+    if ($packagePath !== null) {
+        $filepath = realpath($packagePath);
+        if ($filepath !== false) {
+            /**
+             * @var non-empty-string
+             */
+            return $filepath;
+        }
+    }
+
+    throw new OutOfBoundsException("Package `$package` have a null install path.");
+}