Issue #3067813 by code_brown, jonathan_hunt, ravi.shankar,...

Issue #3067813 by code_brown, jonathan_hunt, ravi.shankar, saurabh.tripathi.cs: Deprecated function assert message on PHP 7.2

src/ExternalLibrary/Local/LocalLibraryTrait.php

@@ -92,8 +92,8 @@ trait LocalLibraryTrait {
     $this->installed = TRUE;
     $this->localPath = (string) $path;
 
-    assert('$this->localPath !== ""');
-    assert('$this->localPath[0] !== "/"');
+    assert($this->localPath !== "");
+    assert($this->localPath[0] !== "/");
   }
 
 }

src/Plugin/libraries/Locator/UriLocator.php

@@ -73,7 +73,7 @@ class UriLocator implements LocatorInterface, ContainerFactoryPluginInterface {
   public function locate(LocalLibraryInterface $library) {
     /** @var \Drupal\Core\StreamWrapper\LocalStream $stream_wrapper */
     $stream_wrapper = $this->streamWrapperManager->getViaUri($this->uri);
-    assert('$stream_wrapper instanceof \Drupal\Core\StreamWrapper\LocalStream');
+    assert($stream_wrapper instanceof \Drupal\Core\StreamWrapper\LocalStream);
     // Calling LocalStream::getDirectoryPath() explicitly avoids the realpath()
     // usage in LocalStream::getLocalPath(), which breaks if Libraries API is
     // symbolically linked into the Drupal installation.

src/Plugin/libraries/Type/AssetLibraryType.php

@@ -24,7 +24,7 @@ class AssetLibraryType extends LibraryTypeBase implements AttachableAssetLibrary
    * {@inheritdoc}
    */
   public function getAttachableAssetLibraries(LibraryInterface $library, LibraryManagerInterface $library_manager) {
-    assert('$library instanceof \Drupal\libraries\ExternalLibrary\Asset\AssetLibraryInterface');
+    assert($library instanceof \Drupal\libraries\ExternalLibrary\Asset\AssetLibraryInterface);
     /** @var \Drupal\libraries\ExternalLibrary\Asset\AssetLibraryInterface $library */
     return [$library->getId() => $library->getAttachableAssetLibrary($library_manager)];
   }

src/Plugin/libraries/Type/MultipleAssetLibraryType.php

@@ -25,7 +25,7 @@ class MultipleAssetLibraryType extends LibraryTypeBase implements AttachableAsse
    * {@inheritdoc}
    */
   public function getAttachableAssetLibraries(LibraryInterface $external_library, LibraryManagerInterface $library_manager) {
-    assert('$external_library instanceof \Drupal\libraries\ExternalLibrary\Asset\MultipleAssetLibraryInterface');
+    assert($external_library instanceof \Drupal\libraries\ExternalLibrary\Asset\MultipleAssetLibraryInterface);
     /** @var \Drupal\libraries\ExternalLibrary\Asset\MultipleAssetLibraryInterface $external_library */
     $attachable_libraries = [];
     foreach ($external_library->getAttachableAssetLibraries($library_manager) as $component_name => $attachable_library) {