fix: create shiki with dual themes

src/Shiki.php

@@ -8,7 +8,10 @@
 
 class Shiki
 {
-    protected string $defaultTheme;
+    /**
+     * @var string|array<string, string>|null $defaultTheme Can be a single theme or an array with a light and a dark theme.
+     */
+    protected mixed $defaultTheme;
 
     private static ?string $customWorkingDirPath = null;
 
@@ -51,7 +54,10 @@ public function getAvailableLanguages(): array
         return $languages;
     }
 
-    public function __construct(string $defaultTheme = 'nord')
+    /**
+     * @param string|array<string, string>|null $defaultTheme Can be a single theme or an array with a light and a dark theme.
+     */
+    public function __construct(mixed $defaultTheme = 'nord')
     {
         $this->defaultTheme = $defaultTheme;
     }

tests/ShikiTest.php

@@ -4,13 +4,36 @@
 
 use function Spatie\Snapshots\assertMatchesSnapshot;
 
-beforeAll(fn () => Shiki::setCustomWorkingDirPath(null));
+beforeAll(fn() => Shiki::setCustomWorkingDirPath(null));
 
 it('can get the default workingDirPath', function () {
     expect((new Shiki())->getWorkingDirPath())
         ->toBeString()->toBe(dirname(__DIR__) . '/bin');
 });
 
+it('can accept a single theme', function () {
+    $code = '<?php echo "Hello World"; ?>';
+
+    $highlighter = new Shiki('github-light');
+
+    $highlightedCode = $highlighter->highlightCode($code, 'php');
+
+    assertMatchesSnapshot($highlightedCode);
+});
+
+it('can accept a light and a dark theme', function () {
+    $code = '<?php echo "Hello World"; ?>';
+
+    $highlighter = new Shiki([
+        'light' => 'github-light',
+        'dark' => 'github-dark',
+    ]);
+
+    $highlightedCode = $highlighter->highlightCode($code, 'php');
+
+    assertMatchesSnapshot($highlightedCode);
+});
+
 it('can highlight php', function () {
     $code = '<?php echo "Hello World"; ?>';
 

tests/__snapshots__/ShikiTest__it_can_accept_a_light_and_a_dark_theme__1.txt

@@ -0,0 +1 @@
+<pre class="shiki shiki-themes github-light github-dark" style="background-color:#fff;--shiki-dark-bg:#24292e;color:#24292e;--shiki-dark:#e1e4e8;"><code><span class="line"><span style="color:#D73A49;--shiki-dark:#F97583">&lt;?</span><span style="color:#005CC5;--shiki-dark:#79B8FF">php</span><span style="color:#24292E;--shiki-dark:#E1E4E8"> </span><span style="color:#005CC5;--shiki-dark:#79B8FF">echo</span><span style="color:#24292E;--shiki-dark:#E1E4E8"> </span><span style="color:#032F62;--shiki-dark:#9ECBFF">&quot;Hello World&quot;</span><span style="color:#24292E;--shiki-dark:#E1E4E8">; </span><span style="color:#D73A49;--shiki-dark:#F97583">?&gt;</span></span></code></pre>

tests/__snapshots__/ShikiTest__it_can_accept_a_single_theme__1.txt

@@ -0,0 +1 @@
+<pre class="shiki" style="background-color: #fff"><code><span class="line"><span style="color: #D73A49">&lt;?</span><span style="color: #005CC5">php</span><span style="color: #24292E"> </span><span style="color: #005CC5">echo</span><span style="color: #24292E"> </span><span style="color: #032F62">&quot;Hello World&quot;</span><span style="color: #24292E">; </span><span style="color: #D73A49">?&gt;</span></span></code></pre>