diff --git a/bin/shiki.js b/bin/shiki.js
index e649beb..38461fb 100644
--- a/bin/shiki.js
+++ b/bin/shiki.js
@@ -38,7 +38,22 @@ async function main(args) {
     if (!customLanguages[language]) await highlighter.loadLanguage(language);
 
     if (args[0] === 'languages') {
-        process.stdout.write(JSON.stringify(highlighter.getLoadedLanguages()));
+        process.stdout.write(
+            JSON.stringify([
+                ...Object.keys(shiki.bundledLanguagesBase),
+                ...Object.keys(customLanguages),
+            ])
+        );
+        return;
+    }
+
+    if (args[0] === 'aliases') {
+        process.stdout.write(
+            JSON.stringify([
+                ...Object.keys(shiki.bundledLanguages),
+                ...Object.keys(customLanguages),
+            ])
+        );
         return;
     }
 
diff --git a/src/Shiki.php b/src/Shiki.php
index 372ff76..955bbb7 100644
--- a/src/Shiki.php
+++ b/src/Shiki.php
@@ -62,7 +62,11 @@ public function getAvailableThemes(): array
 
     public function languageIsAvailable(string $language): bool
     {
-        return in_array($language, $this->getAvailableLanguages());
+        $shikiResult = $this->callShiki('aliases');
+
+        $aliases = json_decode($shikiResult, true);
+
+        return in_array($language, $aliases);
     }
 
     public function themeIsAvailable(string $theme): bool
diff --git a/tests/ShikiCustomRenderTest.php b/tests/ShikiCustomRenderTest.php
index 3acb807..0a950f3 100644
--- a/tests/ShikiCustomRenderTest.php
+++ b/tests/ShikiCustomRenderTest.php
@@ -140,6 +140,9 @@
     $availableLanguages = (new Shiki())->getAvailableLanguages();
 
     expect($availableLanguages)->not()->toBeEmpty();
+    expect($availableLanguages)->toContain('javascript');
+    // should not include aliases
+    expect($availableLanguages)->not()->toContain('js');
 });
 
 it('can determine that a theme is available', function () {
@@ -154,4 +157,7 @@
 
     expect($shiki->languageIsAvailable('php'))->toBeTrue();
     expect($shiki->languageIsAvailable('non-existing-language'))->toBeFalse();
+    expect($shiki->languageIsAvailable('javascript'))->toBeTrue();
+    // should match aliases
+    expect($shiki->languageIsAvailable('js'))->toBeTrue();
 });
diff --git a/tests/ShikiTest.php b/tests/ShikiTest.php
index f961ed6..6599740 100644
--- a/tests/ShikiTest.php
+++ b/tests/ShikiTest.php
@@ -137,6 +137,9 @@
     $availableLanguages = (new Shiki())->getAvailableLanguages();
 
     expect($availableLanguages)->not()->toBeEmpty();
+    expect($availableLanguages)->toContain('javascript');
+    // should not include aliases
+    expect($availableLanguages)->not()->toContain('js');
 });
 
 it('can determine that a theme is available', function () {
@@ -151,4 +154,7 @@
 
     expect($shiki->languageIsAvailable('php'))->toBeTrue();
     expect($shiki->languageIsAvailable('non-existing-language'))->toBeFalse();
+    expect($shiki->languageIsAvailable('javascript'))->toBeTrue();
+    // should match aliases
+    expect($shiki->languageIsAvailable('js'))->toBeTrue();
 });
diff --git a/tests/testfiles/alt-bin/shiki.js b/tests/testfiles/alt-bin/shiki.js
index c2ff3c1..acd09a1 100644
--- a/tests/testfiles/alt-bin/shiki.js
+++ b/tests/testfiles/alt-bin/shiki.js
@@ -38,7 +38,22 @@ async function main(args) {
     if (!customLanguages[language]) await highlighter.loadLanguage(language);
 
     if (args[0] === 'languages') {
-        process.stdout.write(JSON.stringify(highlighter.getLoadedLanguages()));
+        process.stdout.write(
+            JSON.stringify([
+                ...Object.keys(shiki.bundledLanguagesBase),
+                ...Object.keys(customLanguages),
+            ])
+        );
+        return;
+    }
+
+    if (args[0] === 'aliases') {
+        process.stdout.write(
+            JSON.stringify([
+                ...Object.keys(shiki.bundledLanguages),
+                ...Object.keys(customLanguages),
+            ])
+        );
         return;
     }