diff --git a/core/lib/Drupal/Core/StreamWrapper/ExtensionStreamBase.php b/core/lib/Drupal/Core/StreamWrapper/ExtensionStreamBase.php
index f58b0ff..c0ff68c 100644
--- a/core/lib/Drupal/Core/StreamWrapper/ExtensionStreamBase.php
+++ b/core/lib/Drupal/Core/StreamWrapper/ExtensionStreamBase.php
@@ -63,7 +63,7 @@ protected function getTarget($uri = NULL) {
   public function getExternalUrl() {
     $dir = $this->getDirectoryPath();
     if (empty($dir)) {
-      throw new \InvalidArgumentException("Extension directory for {$this->uri} does not exist.");
+      throw new \RuntimeException("Extension directory for {$this->uri} does not exist.");
     }
     $path = rtrim(base_path() . $dir . '/' . $this->getTarget(), '/');
     return $this->getRequest()->getUriForPath($path);
diff --git a/core/lib/Drupal/Core/StreamWrapper/LibraryStream.php b/core/lib/Drupal/Core/StreamWrapper/LibraryStream.php
index a529535..ee6294d 100644
--- a/core/lib/Drupal/Core/StreamWrapper/LibraryStream.php
+++ b/core/lib/Drupal/Core/StreamWrapper/LibraryStream.php
@@ -24,7 +24,7 @@ protected function getOwnerName() {
     $library_discovery = new LibraryDiscovery($this->getDrupalRoot());
     $files = $library_discovery->scan($name);
     if (!isset($files[$name])) {
-      throw new \InvalidArgumentException("Library $name does not exist");
+      throw new \RuntimeException("Library $name does not exist");
     }
 
     return $name;
diff --git a/core/lib/Drupal/Core/StreamWrapper/ModuleStream.php b/core/lib/Drupal/Core/StreamWrapper/ModuleStream.php
index 75230d9..d88a3c0 100644
--- a/core/lib/Drupal/Core/StreamWrapper/ModuleStream.php
+++ b/core/lib/Drupal/Core/StreamWrapper/ModuleStream.php
@@ -21,7 +21,7 @@ protected function getOwnerName() {
     $name = parent::getOwnerName();
     if (!$this->getModuleHandler()->moduleExists($name)) {
       // The module does not exist or is not installed.
-      throw new \InvalidArgumentException("Module $name does not exist or is not installed");
+      throw new \RuntimeException("Module $name does not exist or is not installed");
     }
     return $name;
   }
diff --git a/core/lib/Drupal/Core/StreamWrapper/ThemeStream.php b/core/lib/Drupal/Core/StreamWrapper/ThemeStream.php
index 00cfa50..baf65ac 100644
--- a/core/lib/Drupal/Core/StreamWrapper/ThemeStream.php
+++ b/core/lib/Drupal/Core/StreamWrapper/ThemeStream.php
@@ -21,7 +21,7 @@ protected function getOwnerName() {
     $name = parent::getOwnerName();
     if (!$this->getThemeHandler()->themeExists($name)) {
       // The theme does not exist or is not installed.
-      throw new \InvalidArgumentException("Theme $name does not exist or is not installed");
+      throw new \RuntimeException("Theme $name does not exist or is not installed");
     }
     return $name;
   }
diff --git a/core/modules/system/tests/src/Kernel/File/ExtensionStreamTest.php b/core/modules/system/tests/src/Kernel/File/ExtensionStreamTest.php
index bbba29c..27d5a41 100644
--- a/core/modules/system/tests/src/Kernel/File/ExtensionStreamTest.php
+++ b/core/modules/system/tests/src/Kernel/File/ExtensionStreamTest.php
@@ -4,6 +4,7 @@
 
 use Drupal\Core\Site\Settings;
 use Drupal\KernelTests\KernelTestBase;
+use Symfony\Component\Filesystem\Filesystem;
 
 /**
  * Tests system stream wrapper functions.
@@ -34,6 +35,13 @@ class ExtensionStreamTest extends KernelTestBase {
   public static $modules = ['system'];
 
   /**
+   * The path to the stub library for testing the library wrapper.
+   *
+   * @var string
+   */
+  protected $stubLibraryPath;
+
+  /**
    * {@inheritdoc}
    */
   public function setUp() {
@@ -45,7 +53,7 @@ public function setUp() {
     /** @var \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface $stream_wrapper_manager */
     $stream_wrapper_manager = $this->container->get('stream_wrapper_manager');
     // Get stream wrapper instances.
-    foreach (['module', 'theme', 'profile'] as $scheme) {
+    foreach (['module', 'theme', 'profile', 'library'] as $scheme) {
       $this->streamWrappers[$scheme] = $stream_wrapper_manager->getViaScheme($scheme);
     }
 
@@ -65,6 +73,21 @@ public function setUp() {
     $theme_installer = $this->container->get('theme_installer');
     // Install Bartik and Seven themes.
     $theme_installer->install(['bartik', 'seven']);
+
+    // Create a stub library for testing.
+    $this->stubLibraryPath = \Drupal::service('site.path') . '/libraries/extension-stream-test';
+    $f = new Filesystem();
+    $f->mkdir([$this->stubLibraryPath, $this->stubLibraryPath . '/subdirectory']);
+    $f->touch([$this->stubLibraryPath . '/empty', $this->stubLibraryPath . '/subdirectory/empty']);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function tearDown() {
+    parent::tearDown();
+    $f = new Filesystem();
+    $f->remove($this->stubLibraryPath);
   }
 
   /**
@@ -112,11 +135,11 @@ public function providerInvalidUris() {
    *
    * @param string $uri
    *   The uri to be tested.
-   * @param string|\InvalidArgumentException $dirname
+   * @param string|\RuntimeException|\InvalidArgumentException $dirname
    *   The expectation for dirname() method.
-   * @param string|\InvalidArgumentException $realpath
+   * @param string|\RuntimeException|\InvalidArgumentException $realpath
    *   The expectation for realpath() method.
-   * @param string|\InvalidArgumentException $getExternalUrl
+   * @param string|\RuntimeException|\InvalidArgumentException $getExternalUrl
    *   The expectation for getExternalUrl() method.
    *
    * @dataProvider providerStreamWrapperMethods
@@ -126,7 +149,7 @@ public function testStreamWrapperMethods($uri, $dirname, $realpath, $getExternal
     $realpath = is_string($realpath) ? DRUPAL_ROOT . $realpath : $realpath;
     // Prefix getExternalUrl() expected value with base url.
     $getExternalUrl = is_string($getExternalUrl) ? "{$this->baseUrl}$getExternalUrl" : $getExternalUrl;
-    $case = compact($dirname, $realpath, $getExternalUrl);
+    $case = compact('dirname', 'realpath', 'getExternalUrl');
 
     foreach ($case as $method => $expected) {
       list($scheme, ) = explode('://', $uri);
@@ -142,6 +165,17 @@ public function testStreamWrapperMethods($uri, $dirname, $realpath, $getExternal
           $this->assertSame($expected->getMessage(), $e->getMessage(), $message);
         }
       }
+      else if ($expected instanceof \RuntimeException) {
+        /** @var \RuntimeException $expected */
+        $message = sprintf('Exception thrown: \RuntimeException("%s").', $expected->getMessage());
+        try {
+          $this->streamWrappers[$scheme]->$method();
+          $this->fail($message);
+        }
+        catch (\RuntimeException $e) {
+          $this->assertSame($expected->getMessage(), $e->getMessage(), $message);
+        }
+      }
       elseif (is_string($expected)) {
         $this->assertSame($expected,  $this->streamWrappers[$scheme]->$method());
       }
@@ -196,15 +230,15 @@ public function providerStreamWrapperMethods() {
       ],
       [
         'module://ckeditor/ckeditor.info.yml',
-        new \InvalidArgumentException('Module ckeditor does not exist or is not installed'),
-        new \InvalidArgumentException('Module ckeditor does not exist or is not installed'),
-        new \InvalidArgumentException('Module ckeditor does not exist or is not installed'),
+        new \RuntimeException('Module ckeditor does not exist or is not installed'),
+        new \RuntimeException('Module ckeditor does not exist or is not installed'),
+        new \RuntimeException('Module ckeditor does not exist or is not installed'),
       ],
       [
         'module://foo_bar/foo.bar.js',
-        new \InvalidArgumentException('Module foo_bar does not exist or is not installed'),
-        new \InvalidArgumentException('Module foo_bar does not exist or is not installed'),
-        new \InvalidArgumentException('Module foo_bar does not exist or is not installed'),
+        new \RuntimeException('Module foo_bar does not exist or is not installed'),
+        new \RuntimeException('Module foo_bar does not exist or is not installed'),
+        new \RuntimeException('Module foo_bar does not exist or is not installed'),
       ],
       // Cases for theme:// stream wrapper.
       [
@@ -227,15 +261,15 @@ public function providerStreamWrapperMethods() {
       ],
       [
         'theme://fifteen/screenshot.png',
-        new \InvalidArgumentException('Theme fifteen does not exist or is not installed'),
-        new \InvalidArgumentException('Theme fifteen does not exist or is not installed'),
-        new \InvalidArgumentException('Theme fifteen does not exist or is not installed'),
+        new \RuntimeException('Theme fifteen does not exist or is not installed'),
+        new \RuntimeException('Theme fifteen does not exist or is not installed'),
+        new \RuntimeException('Theme fifteen does not exist or is not installed'),
       ],
       [
         'theme://stark/stark.info.yml',
-        new \InvalidArgumentException('Theme stark does not exist or is not installed'),
-        new \InvalidArgumentException('Theme stark does not exist or is not installed'),
-        new \InvalidArgumentException('Theme stark does not exist or is not installed'),
+        new \RuntimeException('Theme stark does not exist or is not installed'),
+        new \RuntimeException('Theme stark does not exist or is not installed'),
+        new \RuntimeException('Theme stark does not exist or is not installed'),
       ],
       // Cases for profile:// stream wrapper.
       [
@@ -262,6 +296,37 @@ public function providerStreamWrapperMethods() {
         '/core/profiles/minimal/minimal.info.yml',
         'core/profiles/minimal/minimal.info.yml',
       ],
+      // Cases for library:// stream wrapper.
+      [
+        'library://extension-stream-test',
+        'library://extension-stream-test',
+        '/libraries/extension-stream-test',
+        'libraries/extension-stream-test',
+      ],
+      [
+        'library://extension-stream-test/empty',
+        'library://extension-stream-test',
+        '/libraries/extension-stream-test/empty',
+        'libraries/extension-stream-test/empty',
+      ],
+      [
+        'library://extension-stream-test/subdirectory/empty',
+        'library://extension-stream-test/subdirectory',
+        '/libraries/extension-stream-test/subdirectory/empty',
+        'libraries/extension-stream-test/subdirectory/empty',
+      ],
+      [
+        'library://does-not-exist',
+        new \RuntimeException('Library does-not-exist does not exist'),
+        new \RuntimeException('Library does-not-exist does not exist'),
+        new \RuntimeException('Library does-not-exist does not exist'),
+      ],
+      [
+        'library://does-not-exist/does-not-exist.js',
+        new \RuntimeException('Library does-not-exist does not exist'),
+        new \RuntimeException('Library does-not-exist does not exist'),
+        new \RuntimeException('Library does-not-exist does not exist'),
+      ],
     ];
   }