feat: adds pest function

src/Configuration.php

@@ -0,0 +1,71 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest;
+
+use Pest\PendingCalls\UsesCall;
+use Pest\Support\Backtrace;
+
+/**
+ * @internal
+ */
+final class Configuration
+{
+    /**
+     * The instance of the configuration.
+     */
+    private static ?Configuration $instance = null;
+
+    /**
+     * Gets the instance of the configuration.
+     */
+    public static function getInstance(): Configuration
+    {
+        return self::$instance ??= new Configuration(
+            Backtrace::file(),
+        );
+    }
+
+    /**
+     * Creates a new configuration instance.
+     */
+    private function __construct(
+        private readonly string $filename,
+    ) {
+    }
+
+    /**
+     * Gets the configuration of a certain folder.
+     */
+    public function in(string ...$targets): UsesCall
+    {
+        return (new UsesCall($this->filename, []))->in(...$targets);
+    }
+
+    /**
+     * Depending on where is called, it will extend the given classes and traits globally or locally.
+     */
+    public function extend(string ...$classAndTraits): UsesCall
+    {
+        return (new UsesCall($this->filename, array_values($classAndTraits)))
+            ->in($this->filename)
+            ->extend(...$classAndTraits);
+    }
+
+    /**
+     * Depending on where is called, it will extend the given classes and traits globally or locally.
+     */
+    public function use(string ...$classAndTraits): UsesCall
+    {
+        return $this->extend(...$classAndTraits);
+    }
+
+    /**
+     * Gets the theme configuration.
+     */
+    public function theme(): Configuration\Theme
+    {
+        return new Configuration\Theme();
+    }
+}