diff --git a/libraries.api.php b/libraries.api.php
index 859e6023eb4529bcdb3731fefc7a44971744aabe..7e127ae6514284cd7f777647c31ebe9d1e411d02 100644
--- a/libraries.api.php
+++ b/libraries.api.php
@@ -341,7 +341,7 @@ function hook_libraries_info() {
 
   // This array key lets Libraries API search for 'sites/all/libraries/example'
   // directory, which should contain the entire, original extracted library.
-  $libraries['example'] = array(
+  $libraries['example'] = [
     // Only used in administrative UI of Libraries API.
     'name' => 'Example library',
     'vendor url' => 'http://example.com',
@@ -353,53 +353,53 @@ function hook_libraries_info() {
     'version callback' => 'mymodule_get_version',
     // Specify arguments for the version callback. By default,
     // libraries_get_version() takes a named argument array:
-    'version arguments' => array(
+    'version arguments' => [
       'file' => 'docs/CHANGELOG.txt',
       'pattern' => '@version\s+([0-9a-zA-Z\.-]+)@',
       'lines' => 5,
       'cols' => 20,
-    ),
+    ],
     // Default list of files of the library to load. Important: Only specify
     // third-party files belonging to the library here, not integration files of
     // your module.
-    'files' => array(
+    'files' => [
       // 'js' and 'css' follow the syntax of hook_library(), but file paths are
       // relative to the library path.
-      'js' => array(
+      'js' => [
         'exlib.js',
         'gadgets/foo.js',
-      ),
-      'css' => array(
+      ],
+      'css' => [
         'lib_style.css',
         'skin/example.css',
-      ),
+      ],
       // For PHP libraries, specify include files here, still relative to the
       // library path.
-      'php' => array(
+      'php' => [
         'exlib.php',
         'exlib.inc',
-      ),
-    ),
+      ],
+    ],
     // Optional: Specify alternative variants of the library, if available.
-    'variants' => array(
+    'variants' => [
       // All properties defined for 'minified' override top-level properties.
-      'minified' => array(
-        'files' => array(
-          'js' => array(
+      'minified' => [
+        'files' => [
+          'js' => [
             'exlib.min.js',
             'gadgets/foo.min.js',
-          ),
-          'css' => array(
+          ],
+          'css' => [
             'lib_style.css',
             'skin/example.css',
-          ),
-        ),
+          ],
+        ],
         'variant callback' => 'mymodule_check_variant',
-        'variant arguments' => array(
+        'variant arguments' => [
           'variant' => 'minified',
-        ),
-      ),
-    ),
+        ],
+      ],
+    ],
     // Optional, but usually required: Override top-level properties for later
     // versions of the library. The properties of the minimum version that is
     // matched override the top-level properties. Note:
@@ -409,85 +409,85 @@ function hook_libraries_info() {
     //   defaults.
     // - The array keys have to be strings, as PHP does not support floats for
     //   array keys.
-    'versions' => array(
-      '2' => array(
-        'files' => array(
-          'js' => array('exlib.js'),
-          'css' => array('exlib_style.css'),
-        ),
-      ),
-      '3.0' => array(
-        'files' => array(
-          'js' => array('exlib.js'),
-          'css' => array('lib_style.css'),
-        ),
-      ),
-      '3.2' => array(
-        'files' => array(
-          'js' => array(
+    'versions' => [
+      '2' => [
+        'files' => [
+          'js' => ['exlib.js'],
+          'css' => ['exlib_style.css'],
+        ],
+      ],
+      '3.0' => [
+        'files' => [
+          'js' => ['exlib.js'],
+          'css' => ['lib_style.css'],
+        ],
+      ],
+      '3.2' => [
+        'files' => [
+          'js' => [
             'exlib.js',
             'gadgets/foo.js',
-          ),
-          'css' => array(
+          ],
+          'css' => [
             'lib_style.css',
             'skin/example.css',
-          ),
-        ),
-      ),
-    ),
+          ],
+        ],
+      ],
+    ],
     // Optional: Register files to auto-load for your module. All files must be
     // keyed by module, and follow the syntax of the 'files' property.
-    'integration files' => array(
-      'mymodule' => array(
-        'js' => array('ex_lib.inc'),
-      ),
-    ),
+    'integration files' => [
+      'mymodule' => [
+        'js' => ['ex_lib.inc'],
+      ],
+    ],
     // Optionally register callbacks to apply to the library during different
     // stages of its lifetime ('callback groups').
-    'callbacks' => array(
+    'callbacks' => [
       // Used to alter the info associated with the library.
-      'info' => array(
+      'info' => [
         'mymodule_example_libraries_info_callback',
-      ),
+      ],
       // Called before detecting the given library.
-      'pre-detect' => array(
+      'pre-detect' => [
         'mymodule_example_libraries_predetect_callback',
-      ),
+      ],
       // Called after detecting the library.
-      'post-detect' => array(
+      'post-detect' => [
         'mymodule_example_libraries_postdetect_callback',
-      ),
+      ],
       // Called before the library is loaded.
-      'pre-load' => array(
+      'pre-load' => [
         'mymodule_example_libraries_preload_callback',
-      ),
+      ],
       // Called after the library is loaded.
-      'post-load' => array(
+      'post-load' => [
         'mymodule_example_libraries_postload_callback',
-      ),
-    ),
-  );
+      ],
+    ],
+  ];
 
   // A very simple library. No changing APIs (hence, no versions), no variants.
   // Expected to be extracted into 'sites/all/libraries/simple'.
-  $libraries['simple'] = array(
+  $libraries['simple'] = [
     'name' => 'Simple library',
     'vendor url' => 'http://example.com/simple',
     'download url' => 'http://example.com/simple',
-    'version arguments' => array(
+    'version arguments' => [
       'file' => 'readme.txt',
       // Best practice: Document the actual version strings for later reference.
       // 1.x: Version 1.0
       'pattern' => '/Version (\d+)/',
       'lines' => 5,
-    ),
-    'files' => array(
-      'js' => array('simple.js'),
-    ),
-  );
+    ],
+    'files' => [
+      'js' => ['simple.js'],
+    ],
+  ];
 
   // A library that (naturally) evolves over time with API changes.
-  $libraries['tinymce'] = array(
+  $libraries['tinymce'] = [
     'name' => 'TinyMCE',
     'vendor url' => 'http://tinymce.moxiecode.com',
     'download url' => 'http://tinymce.moxiecode.com/download.php',
@@ -495,7 +495,7 @@ function hook_libraries_info() {
     // The regular expression catches two parts (the major and the minor
     // version), which libraries_get_version() doesn't allow.
     'version callback' => 'tinymce_get_version',
-    'version arguments' => array(
+    'version arguments' => [
       // It can be easier to parse the first characters of a minified file
       // instead of doing a multi-line pattern matching in a source file. See
       // 'lines' and 'cols' below.
@@ -506,61 +506,61 @@ function hook_libraries_info() {
       'pattern' => '@majorVersion[=:]["\'](\d).+?minorVersion[=:]["\']([\d\.]+)@',
       'lines' => 1,
       'cols' => 100,
-    ),
-    'versions' => array(
-      '2.1' => array(
-        'files' => array(
-          'js' => array('tiny_mce.js'),
-        ),
-        'variants' => array(
-          'source' => array(
-            'files' => array(
-              'js' => array('tiny_mce_src.js'),
-            ),
-          ),
-        ),
-        'integration files' => array(
-          'wysiwyg' => array(
-            'js' => array('editors/js/tinymce-2.js'),
-            'css' => array('editors/js/tinymce-2.css'),
-          ),
-        ),
-      ),
+    ],
+    'versions' => [
+      '2.1' => [
+        'files' => [
+          'js' => ['tiny_mce.js'],
+        ],
+        'variants' => [
+          'source' => [
+            'files' => [
+              'js' => ['tiny_mce_src.js'],
+            ],
+          ],
+        ],
+        'integration files' => [
+          'wysiwyg' => [
+            'js' => ['editors/js/tinymce-2.js'],
+            'css' => ['editors/js/tinymce-2.css'],
+          ],
+        ],
+      ],
       // Definition used if 3.1 or above is detected.
-      '3.1' => array(
+      '3.1' => [
         // Does not support JS aggregation.
-        'files' => array(
-          'js' => array(
-            'tiny_mce.js' => array('preprocess' => FALSE),
-          ),
-        ),
-        'variants' => array(
+        'files' => [
+          'js' => [
+            'tiny_mce.js' => ['preprocess' => FALSE],
+          ],
+        ],
+        'variants' => [
           // New variant leveraging jQuery. Not stable yet; therefore not the
           // default variant.
-          'jquery' => array(
-            'files' => array(
-              'js' => array(
-                'tiny_mce_jquery.js' => array('preprocess' => FALSE),
-              ),
-            ),
-          ),
-          'source' => array(
-            'files' => array(
-              'js' => array(
-                'tiny_mce_src.js' => array('preprocess' => FALSE),
-              ),
-            ),
-          ),
-        ),
-        'integration files' => array(
-          'wysiwyg' => array(
-            'js' => array('editors/js/tinymce-3.js'),
-            'css' => array('editors/js/tinymce-3.css'),
-          ),
-        ),
-      ),
-    ),
-  );
+          'jquery' => [
+            'files' => [
+              'js' => [
+                'tiny_mce_jquery.js' => ['preprocess' => FALSE],
+              ],
+            ],
+          ],
+          'source' => [
+            'files' => [
+              'js' => [
+                'tiny_mce_src.js' => ['preprocess' => FALSE],
+              ],
+            ],
+          ],
+        ],
+        'integration files' => [
+          'wysiwyg' => [
+            'js' => ['editors/js/tinymce-3.js'],
+            'css' => ['editors/js/tinymce-3.css'],
+          ],
+        ],
+      ],
+    ],
+  ];
   return $libraries;
 }
 
@@ -577,9 +577,9 @@ function hook_libraries_info() {
  * @deprecated Will be removed before a stable Drupal 8 release.
  */
 function hook_libraries_info_alter(&$libraries) {
-  $files = array(
-    'php' => array('example_module.php_spellchecker.inc'),
-  );
+  $files = [
+    'php' => ['example_module.php_spellchecker.inc'],
+  ];
   $libraries['php_spellchecker']['integration files']['example_module'] = $files;
 }
 
@@ -605,5 +605,5 @@ function hook_libraries_info_alter(&$libraries) {
 function hook_libraries_info_file_paths() {
   // Taken from the Libraries test module, which needs to specify the path to
   // the test library.
-  return array(drupal_get_path('module', 'libraries_test') . '/example');
+  return [drupal_get_path('module', 'libraries_test') . '/example'];
 }
diff --git a/libraries.drush.inc b/libraries.drush.inc
index 3d9f7cd429584aee94f5843f5311fa9408ca87c7..fe9003b7aed420cee5b2b2f6e23c3aa98a7ad2ca 100644
--- a/libraries.drush.inc
+++ b/libraries.drush.inc
@@ -11,18 +11,20 @@ use Drupal\Component\Utility\Unicode;
  * Implements hook_drush_command().
  */
 function libraries_drush_command() {
-  $items['libraries-list'] = array(
+  $items['libraries-list'] = [
     'callback' => 'libraries_drush_list',
     'description' => dt('Lists registered library information.'),
     'bootstrap' => DRUSH_BOOTSTRAP_DRUPAL_FULL,
-  );
-  /**$items['libraries-download'] = array(
-    'callback' => 'libraries_drush_download',
-    'description' => dt('Downloads a registered library into the libraries directory for the active site.'),
-    'arguments' => array(
-      'name' => dt('The internal name of the registered library.'),
-    ),
-  );*/
+  ];
+  /*
+    $items['libraries-download'] = array[
+      'callback' => 'libraries_drush_download',
+      'description' => dt('Downloads a registered library into the libraries directory for the active site.'),
+      'arguments' => [
+        'name' => dt('The internal name of the registered library.'),
+      ],
+    ];
+  */
   return $items;
 }
 
@@ -61,7 +63,7 @@ function libraries_drush_invalidate_cache() {
  * Lists registered library information.
  */
 function libraries_drush_list() {
-  $libraries = array();
+  $libraries = [];
   foreach (\Drupal::service('libraries.manager')->info() as $name => $info) {
     $libraries[$name] = \Drupal::service('libraries.manager')->getLibrary($name);
   }
@@ -72,16 +74,22 @@ function libraries_drush_list() {
   }
 
   else {
-    $rows = array();
+    $rows = [];
     // drush_print_table() automatically treats the first row as the header, if
     // $header is TRUE.
-    $rows[] = array(dt('Name'), dt('Status'), dt('Version'), dt('Variants'), dt('Dependencies'));
+    $rows[] = [
+      dt('Name'),
+      dt('Status'),
+      dt('Version'),
+      dt('Variants'),
+      dt('Dependencies'),
+    ];
     foreach ($libraries as $name => $library) {
       $status = ($library['installed'] ? dt('OK') : Unicode::ucfirst($library['error']));
       $version = (($library['installed'] && !empty($library['version'])) ? $library['version'] : '-');
 
       // Only list installed variants.
-      $variants = array();
+      $variants = [];
       foreach ($library['variants'] as $variant_name => $variant) {
         if ($variant['installed']) {
           $variants[] = $variant_name;
@@ -91,11 +99,11 @@ function libraries_drush_list() {
 
       $dependencies = (!empty($library['dependencies']) ? implode(', ', $library['dependencies']) : '-');
 
-      $rows[] = array($name, $status, $version, $variants, $dependencies);
+      $rows[] = [$name, $status, $version, $variants, $dependencies];
     }
     // Make the possible values for the 'Status' column and the 'Version' header
     // wrap nicely.
-    $widths = array(0, 12, 7, 0, 0);
+    $widths = [0, 12, 7, 0, 0];
     drush_print_table($rows, TRUE, $widths);
   }
 }
@@ -103,7 +111,7 @@ function libraries_drush_list() {
 /**
  * Downloads a library.
  *
- * @param $name
+ * @param string $name
  *   The internal name of the library to download.
  */
 function libraries_drush_download($name) {
@@ -126,7 +134,7 @@ function libraries_drush_download($name) {
   // Create the path if it does not exist.
   if (!is_dir($path)) {
     drush_op('mkdir', $path);
-    drush_log(dt('Directory @path was created', array('@path' => $path)), 'notice');
+    drush_log(dt('Directory @path was created', ['@path' => $path]), 'notice');
   }
 
   // Set the directory to the download location.
@@ -136,34 +144,34 @@ function libraries_drush_download($name) {
   $filename = basename(COLORBOX_DOWNLOAD_URI);
   $dirname = basename(COLORBOX_DOWNLOAD_URI, '.zip');
 
-  // Remove any existing Colorbox plugin directory
+  // Remove any existing Colorbox plugin directory.
   if (is_dir($dirname)) {
-    drush_log(dt('A existing Colorbox plugin was overwritten at @path', array('@path' => $path)), 'notice');
+    drush_log(dt('A existing Colorbox plugin was overwritten at @path', ['@path' => $path]), 'notice');
   }
-  // Remove any existing Colorbox plugin zip archive
+  // Remove any existing Colorbox plugin zip archive.
   if (is_file($filename)) {
     drush_op('unlink', $filename);
   }
 
-  // Download the zip archive
-  if (!drush_shell_exec('wget '. COLORBOX_DOWNLOAD_URI)) {
-    drush_shell_exec('curl -O '. COLORBOX_DOWNLOAD_URI);
+  // Download the zip archive.
+  if (!drush_shell_exec('wget ' . COLORBOX_DOWNLOAD_URI)) {
+    drush_shell_exec('curl -O ' . COLORBOX_DOWNLOAD_URI);
   }
 
   if (is_file($filename)) {
-    // Decompress the zip archive
-    drush_shell_exec('unzip -qq -o '. $filename);
-    // Remove the zip archive
+    // Decompress the zip archive.
+    drush_shell_exec('unzip -qq -o ' . $filename);
+    // Remove the zip archive.
     drush_op('unlink', $filename);
   }
 
   // Set working directory back to the previous working directory.
   chdir($olddir);
 
-  if (is_dir($path .'/'. $dirname)) {
-    drush_log(dt('Colorbox plugin has been downloaded to @path', array('@path' => $path)), 'success');
+  if (is_dir($path . '/' . $dirname)) {
+    drush_log(dt('Colorbox plugin has been downloaded to @path', ['@path' => $path]), 'success');
   }
   else {
-    drush_log(dt('Drush was unable to download the Colorbox plugin to @path', array('@path' => $path)), 'error');
+    drush_log(dt('Drush was unable to download the Colorbox plugin to @path', ['@path' => $path]), 'error');
   }
 }
diff --git a/libraries.module b/libraries.module
index 7028d2f9777d097f0814f2a75730a931c5b145db..2a8b623bc1f9160528eaeda28f59a741b08dca22 100644
--- a/libraries.module
+++ b/libraries.module
@@ -108,7 +108,7 @@ function libraries_get_path($name, $base_path = FALSE) {
  * https://www.drupal.org/node/2170763
  */
 function libraries_get_libraries() {
-  $searchdir = array();
+  $searchdir = [];
   $config = DrupalKernel::findSitePath(\Drupal::request());
 
   // @todo core/libraries
@@ -131,8 +131,8 @@ function libraries_get_libraries() {
   $searchdir[] = "$config/libraries";
 
   // Retrieve list of directories.
-  $directories = array();
-  $nomask = array('CVS');
+  $directories = [];
+  $nomask = ['CVS'];
   foreach ($searchdir as $dir) {
     if (is_dir($dir) && $handle = opendir($dir)) {
       while (FALSE !== ($file = readdir($handle))) {
@@ -172,20 +172,20 @@ function libraries_scan_info_files() {
   $config = DrupalKernel::findSitePath(\Drupal::request());
 
   // Build a list of directories.
-  $directories = \Drupal::moduleHandler()->invokeAll('libraries_info_file_paths', $args = array());
+  $directories = \Drupal::moduleHandler()->invokeAll('libraries_info_file_paths', $args = []);
   $directories[] = "$profile/libraries";
   $directories[] = 'sites/all/libraries';
   $directories[] = 'libraries';
   $directories[] = "$config/libraries";
 
   // Scan for info files.
-  $files = array();
+  $files = [];
   foreach ($directories as $dir) {
     if (file_exists($dir)) {
-      $files = array_merge($files, \Drupal::service('file_system')->scanDirectory($dir, '@^[a-z0-9._-]+\.libraries\.info\.yml$@', array(
+      $files = array_merge($files, \Drupal::service('file_system')->scanDirectory($dir, '@^[a-z0-9._-]+\.libraries\.info\.yml$@', [
         'key' => 'name',
         'recurse' => FALSE,
-      )));
+      ]));
     }
   }
 
@@ -294,7 +294,7 @@ function libraries_traverse_library(&$library, $callback) {
 function libraries_prepare_files(&$library, $version = NULL, $variant = NULL) {
   // Both the 'files' property and the 'integration files' property contain file
   // declarations, and we want to make both consistent.
-  $file_types = array();
+  $file_types = [];
   if (isset($library['files'])) {
     $file_types[] = &$library['files'];
   }
@@ -306,12 +306,12 @@ function libraries_prepare_files(&$library, $version = NULL, $variant = NULL) {
   }
   foreach ($file_types as &$files) {
     // Go through all supported types of files.
-    foreach (array('js', 'css', 'php') as $type) {
+    foreach (['js', 'css', 'php'] as $type) {
       if (isset($files[$type])) {
         foreach ($files[$type] as $key => $value) {
           // Unset numeric keys and turn the respective values into keys.
           if (is_numeric($key)) {
-            $files[$type][$value] = array();
+            $files[$type][$value] = [];
             unset($files[$type][$key]);
           }
         }
@@ -351,19 +351,19 @@ function libraries_detect_dependencies(&$library, $version = NULL, $variant = NU
       if (!$info['installed']) {
         $library['installed'] = FALSE;
         $library['error'] = 'missing dependency';
-        $library['error message'] = t('The %dependency library, which the %library library depends on, is not installed.', array(
+        $library['error message'] = t('The %dependency library, which the %library library depends on, is not installed.', [
           '%dependency' => $dependency['name'],
           '%library' => $library['name'],
-        ));
+        ]);
       }
       elseif (!$dependency->isCompatible($info['version'])) {
         $library['installed'] = FALSE;
         $library['error'] = 'incompatible dependency';
-        $library['error message'] = t('The version %dependency_version of the %dependency library is not compatible with the %library library.', array(
+        $library['error message'] = t('The version %dependency_version of the %dependency library is not compatible with the %library library.', [
           '%dependency_version' => $info['version'],
           '%dependency' => $info['name'],
           '%library' => $library['name'],
-        ));
+        ]);
       }
 
       // Remove the version string from the dependency, so libraries_load() can
@@ -401,7 +401,7 @@ function &libraries_info($name = NULL) {
   $libraries = &drupal_static(__FUNCTION__);
 
   if (!isset($libraries)) {
-    $libraries = array();
+    $libraries = [];
     // Gather information from hook_libraries_info().
     $module_handler = \Drupal::moduleHandler();
     foreach ($module_handler->getImplementations('libraries_info') as $module) {
@@ -414,13 +414,13 @@ function &libraries_info($name = NULL) {
     // @see drupal_alter()
     global $theme, $base_theme_info;
     if (isset($theme)) {
-      $theme_keys = array();
+      $theme_keys = [];
       foreach ($base_theme_info as $base) {
         $theme_keys[] = $base->name;
       }
       $theme_keys[] = $theme;
       foreach ($theme_keys as $theme_key) {
-        $function = $theme_key . '_' . 'libraries_info';
+        $function = $theme_key . '_libraries_info';
         if (function_exists($function)) {
           foreach ($function() as $machine_name => $properties) {
             $properties['theme'] = $theme_key;
@@ -440,7 +440,7 @@ function &libraries_info($name = NULL) {
     // 'type' key in info files. We therefore use Symfony's YAML parser
     // directly.
     // @todo Consider creating a dedicating InfoParser for library info files
-    //   similar to \Drupal\Core\Extension\InfoParser
+    //   similar to \Drupal\Core\Extension\InfoParser.
     $parser = new Parser();
     foreach (libraries_scan_info_files() as $machine_name => $file) {
       $properties = $parser->parse(file_get_contents($file->uri));
@@ -487,7 +487,7 @@ function &libraries_info($name = NULL) {
  * https://www.drupal.org/node/2170763
  */
 function libraries_info_defaults(&$library, $name) {
-  $library += array(
+  $library += [
     'machine name' => $name,
     'name' => $name,
     'vendor url' => '',
@@ -495,21 +495,21 @@ function libraries_info_defaults(&$library, $name) {
     'path' => '',
     'library path' => NULL,
     'version callback' => 'libraries_get_version',
-    'version arguments' => array(),
-    'files' => array(),
-    'dependencies' => array(),
-    'variants' => array(),
-    'versions' => array(),
-    'integration files' => array(),
-    'callbacks' => array(),
-  );
-  $library['callbacks'] += array(
-    'info' => array(),
-    'pre-detect' => array(),
-    'post-detect' => array(),
-    'pre-load' => array(),
-    'post-load' => array(),
-  );
+    'version arguments' => [],
+    'files' => [],
+    'dependencies' => [],
+    'variants' => [],
+    'versions' => [],
+    'integration files' => [],
+    'callbacks' => [],
+  ];
+  $library['callbacks'] += [
+    'info' => [],
+    'pre-detect' => [],
+    'post-detect' => [],
+    'pre-load' => [],
+    'post-load' => [],
+  ];
 
   // Add our own callbacks before any others.
   array_unshift($library['callbacks']['info'], 'libraries_prepare_files');
@@ -564,9 +564,9 @@ function libraries_detect($name) {
   }
   if ($library['library path'] === FALSE || !file_exists($library['library path'])) {
     $library['error'] = 'not found';
-    $library['error message'] = t('The %library library could not be found.', array(
+    $library['error message'] = t('The %library library could not be found.', [
       '%library' => $library['name'],
-    ));
+    ]);
     return $library;
   }
 
@@ -579,16 +579,16 @@ function libraries_detect($name) {
     // indexed array of multiple parameters.
     if (isset($library['version arguments'][0])) {
       // Add the library as the first argument.
-      $library['version'] = call_user_func_array($library['version callback'], array_merge(array($library), $library['version arguments']));
+      $library['version'] = call_user_func_array($library['version callback'], array_merge([$library], $library['version arguments']));
     }
     else {
       $library['version'] = $library['version callback']($library, $library['version arguments']);
     }
     if (empty($library['version'])) {
       $library['error'] = 'not detected';
-      $library['error message'] = t('The version of the %library library could not be detected.', array(
+      $library['error message'] = t('The version of the %library library could not be detected.', [
         '%library' => $library['name'],
-      ));
+      ]);
       return $library;
     }
   }
@@ -604,10 +604,10 @@ function libraries_detect($name) {
     }
     if (!$version) {
       $library['error'] = 'not supported';
-      $library['error message'] = t('The installed version %version of the %library library is not supported.', array(
+      $library['error message'] = t('The installed version %version of the %library library is not supported.', [
         '%version' => $library['version'],
         '%library' => $library['name'],
-      ));
+      ]);
       return $library;
     }
 
@@ -628,18 +628,19 @@ function libraries_detect($name) {
         // We support both a single parameter, which is an associative array,
         // and an indexed array of multiple parameters.
         if (isset($variant['variant arguments'][0])) {
-          // Add the library as the first argument, and the variant name as the second.
-          $variant['installed'] = call_user_func_array($variant['variant callback'], array_merge(array($library, $variant_name), $variant['variant arguments']));
+          // Add the library as the first argument, and the variant name as the
+          // second.
+          $variant['installed'] = call_user_func_array($variant['variant callback'], array_merge([$library, $variant_name], $variant['variant arguments']));
         }
         else {
           $variant['installed'] = $variant['variant callback']($library, $variant_name, $variant['variant arguments']);
         }
         if (!$variant['installed']) {
           $variant['error'] = 'not found';
-          $variant['error message'] = t('The %variant variant of the %library library could not be found.', array(
+          $variant['error message'] = t('The %variant variant of the %library library could not be found.', [
             '%variant' => $variant_name,
             '%library' => $library['name'],
-          ));
+          ]);
         }
       }
     }
@@ -679,7 +680,7 @@ function libraries_detect($name) {
  * https://www.drupal.org/node/2170763
  */
 function libraries_load($name, $variant = NULL) {
-  $loaded = &drupal_static(__FUNCTION__, array());
+  $loaded = &drupal_static(__FUNCTION__, []);
 
   if (!isset($loaded[$name])) {
     $library = \Drupal::cache('libraries')->get($name);
@@ -696,7 +697,7 @@ function libraries_load($name, $variant = NULL) {
       // Ensure that the $variant key exists, and if it does not, set its
       // 'installed' property to FALSE by default. This will prevent the loading
       // of the library files below.
-      $library['variants'] += array($variant => array('installed' => FALSE));
+      $library['variants'] += [$variant => ['installed' => FALSE]];
       $library = array_merge($library, $library['variants'][$variant]);
     }
     // Regardless of whether a specific variant was requested or not, there can
@@ -754,7 +755,7 @@ function libraries_load_files($library) {
   // The parameters for drupal_add_js() and drupal_add_css() require special
   // handling.
   // @see drupal_process_attached()
-  foreach (array('js', 'css') as $type) {
+  foreach (['js', 'css'] as $type) {
     // Given the removal of core functions like _drupal_add_js and
     // _drupal_add_css the logic below cannot safely be run anymore.
     // @see https://www.drupal.org/node/2702563
@@ -765,7 +766,7 @@ function libraries_load_files($library) {
         // (and only) argument.
         if (!is_array($options)) {
           $data = $options;
-          $options = array();
+          $options = [];
         }
         // In some cases, the first parameter ($data) is an array. Arrays can't
         // be passed as keys in PHP, so we have to get $data from the value
@@ -804,11 +805,11 @@ function libraries_load_files($library) {
   // Load integration files.
   if (!empty($library['integration files'])) {
     foreach ($library['integration files'] as $module => $files) {
-      libraries_load_files(array(
+      libraries_load_files([
         'files' => $files,
         'path' => '',
         'library path' => drupal_get_path('module', $module),
-      ));
+      ]);
     }
   }
 
@@ -846,12 +847,12 @@ function libraries_load_files($library) {
  */
 function libraries_get_version($library, $options) {
   // Provide defaults.
-  $options += array(
+  $options += [
     'file' => '',
     'pattern' => '',
     'lines' => 20,
     'cols' => 200,
-  );
+  ];
 
   $file = DRUPAL_ROOT . '/' . $library['library path'] . '/' . $options['file'];
   if (empty($options['file']) || !file_exists($file)) {
diff --git a/src/Tests/LibrariesUnitTest.php b/src/Tests/LibrariesUnitTest.php
index f616a92b8ea4caa3855b53244a81fa65f2b7ed0a..8a93c5679fc11fdeab0a4410f0c2206d38662fa0 100644
--- a/src/Tests/LibrariesUnitTest.php
+++ b/src/Tests/LibrariesUnitTest.php
@@ -14,7 +14,7 @@ class LibrariesUnitTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('libraries');
+  public static $modules = ['libraries'];
 
   /**
    * Tests libraries_get_path().
@@ -32,20 +32,20 @@ class LibrariesUnitTest extends KernelTestBase {
    * Tests libraries_prepare_files().
    */
   function testLibrariesPrepareFiles() {
-    $expected = array(
-      'files' => array(
-        'js' => array('example.js' => array()),
-        'css' => array('example.css' => array()),
-        'php' => array('example.php' => array()),
-      ),
-    );
-    $library = array(
-      'files' => array(
-        'js' => array('example.js'),
-        'css' => array('example.css'),
-        'php' => array('example.php'),
-      ),
-    );
+    $expected = [
+      'files' => [
+        'js' => ['example.js' => []],
+        'css' => ['example.css' => []],
+        'php' => ['example.php' => []],
+      ],
+    ];
+    $library = [
+      'files' => [
+        'js' => ['example.js'],
+        'css' => ['example.css'],
+        'php' => ['example.php'],
+      ],
+    ];
     libraries_prepare_files($library, NULL, NULL);
     $this->assertEqual($expected, $library, 'libraries_prepare_files() works correctly.');
   }
diff --git a/src/Tests/LibrariesWebTest.php b/src/Tests/LibrariesWebTest.php
index f0a0da04f75ff6c0d6b32d43e12ef3f20ba301b7..be28c802bb228ee42f362e412d90311a8bc16064 100644
--- a/src/Tests/LibrariesWebTest.php
+++ b/src/Tests/LibrariesWebTest.php
@@ -22,7 +22,7 @@ class LibrariesWebTest extends WebTestBase {
    *
    * @var array
    */
-  public static $modules = array('libraries', 'libraries_test');
+  public static $modules = ['libraries', 'libraries_test'];
 
   /**
    * The URL generator used in this test.
@@ -51,23 +51,23 @@ class LibrariesWebTest extends WebTestBase {
   /**
    * Tests libraries_detect_dependencies().
    */
-  function testLibrariesDetectDependencies() {
-    $library = array(
+  public function testLibrariesDetectDependencies() {
+    $library = [
       'name' => 'Example',
-      'dependencies' => array('Example missing'),
-    );
+      'dependencies' => ['Example missing'],
+    ];
     libraries_detect_dependencies($library);
     $this->assertEqual($library['error'], 'missing dependency', 'libraries_detect_dependencies() detects missing dependency');
-    $error_message = t('The %dependency library, which the %library library depends on, is not installed.', array(
+    $error_message = t('The %dependency library, which the %library library depends on, is not installed.', [
       '%dependency' => 'Example missing',
       '%library' => $library['name'],
-    ));
+    ]);
     $this->verbose("Expected:<br>$error_message");
     $this->verbose('Actual:<br>' . $library['error message']);
     $this->assertEqual($library['error message'], $error_message, 'Correct error message for a missing dependency');
     // Test versioned dependencies.
     $version = '1.1';
-    $compatible = array(
+    $compatible = [
       '1.1',
       '<=1.1',
       '>=1.1',
@@ -80,8 +80,8 @@ class LibrariesWebTest extends WebTestBase {
       '>0.1',
       '<1.2, >1.0',
       '>0.1, <=1.1',
-    );
-    $incompatible = array(
+    ];
+    $incompatible = [
       '1.2',
       '2.0',
       '<1.1',
@@ -93,10 +93,10 @@ class LibrariesWebTest extends WebTestBase {
       '>=1.2',
       '<1.1, >0.9',
       '>=0.1, <1.1',
-    );
-    $library = array(
+    ];
+    $library = [
       'name' => 'Example',
-    );
+    ];
     foreach ($compatible as $version_string) {
       $library['dependencies'][0] = "example_dependency ($version_string)";
       // libraries_detect_dependencies() is a post-detect callback, so
@@ -115,11 +115,11 @@ class LibrariesWebTest extends WebTestBase {
     }
     // Instead of repeating this assertion for each version string, we just
     // re-use the $library variable from the foreach loop.
-    $error_message = t('The version %dependency_version of the %dependency library is not compatible with the %library library.', array(
+    $error_message = t('The version %dependency_version of the %dependency library is not compatible with the %library library.', [
       '%dependency_version' => $version,
       '%dependency' => 'Example dependency',
       '%library' => $library['name'],
-    ));
+    ]);
     $this->verbose("Expected:<br>$error_message");
     $this->verbose('Actual:<br>' . $library['error message']);
     $this->assertEqual($library['error message'], $error_message, 'Correct error message for an incompatible dependency');
@@ -128,12 +128,14 @@ class LibrariesWebTest extends WebTestBase {
   /**
    * Tests libraries_scan_info_files().
    */
-  function testLibrariesScanInfoFiles() {
-    $expected = array('example_info_file' => (object) array(
-      'uri' => drupal_get_path('module', 'libraries') . '/tests/example/example_info_file.libraries.info.yml',
-      'filename' => 'example_info_file.libraries.info.yml',
-      'name' => 'example_info_file.libraries.info',
-    ));
+  public function testLibrariesScanInfoFiles() {
+    $expected = [
+      'example_info_file' => (object) [
+        'uri' => drupal_get_path('module', 'libraries') . '/tests/example/example_info_file.libraries.info.yml',
+        'filename' => 'example_info_file.libraries.info.yml',
+        'name' => 'example_info_file.libraries.info',
+      ],
+    ];
     $actual = libraries_scan_info_files();
     $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
     $this->verbose('Actual:<pre>' . var_export($actual, TRUE) . '</pre>');
@@ -144,19 +146,19 @@ class LibrariesWebTest extends WebTestBase {
   /**
    * Tests libraries_info().
    */
-  function testLibrariesInfo() {
+  public function testLibrariesInfo() {
     // Test that library information is found correctly.
-    $expected = array(
+    $expected = [
       'name' => 'Example files',
       'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
       'version' => '1',
-      'files' => array(
-        'js' => array('example_1.js' => array()),
-        'css' => array('example_1.css' => array()),
-        'php' => array('example_1.php' => array()),
-      ),
+      'files' => [
+        'js' => ['example_1.js' => []],
+        'css' => ['example_1.css' => []],
+        'php' => ['example_1.php' => []],
+      ],
       'module' => 'libraries_test',
-    );
+    ];
     libraries_info_defaults($expected, 'example_files');
     $library = libraries_info('example_files');
     $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
@@ -164,10 +166,10 @@ class LibrariesWebTest extends WebTestBase {
     $this->assertEqual($library, $expected, 'Library information is correctly gathered.');
 
     // Test a library specified with an .info file gets detected.
-    $expected = array(
+    $expected = [
       'name' => 'Example info file',
       'info file' => drupal_get_path('module', 'libraries') . '/tests/example/example_info_file.libraries.info.yml',
-    );
+    ];
     libraries_info_defaults($expected, 'example_info_file');
     $library = libraries_info('example_info_file');
     // If this module was downloaded from Drupal.org, the Drupal.org packaging
@@ -182,33 +184,33 @@ class LibrariesWebTest extends WebTestBase {
   /**
    * Tests libraries_detect().
    */
-  function testLibrariesDetect() {
+  public function testLibrariesDetect() {
     // Test missing library.
     $library = libraries_detect('example_missing');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
     $this->assertEqual($library['error'], 'not found', 'Missing library not found.');
-    $error_message = t('The %library library could not be found.', array(
+    $error_message = t('The %library library could not be found.', [
       '%library' => $library['name'],
-    ));
+    ]);
     $this->assertEqual($library['error message'], $error_message, 'Correct error message for a missing library.');
 
     // Test unknown library version.
     $library = libraries_detect('example_undetected_version');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
     $this->assertEqual($library['error'], 'not detected', 'Undetected version detected as such.');
-    $error_message = t('The version of the %library library could not be detected.', array(
+    $error_message = t('The version of the %library library could not be detected.', [
       '%library' => $library['name'],
-    ));
+    ]);
     $this->assertEqual($library['error message'], $error_message, 'Correct error message for a library with an undetected version.');
 
     // Test unsupported library version.
     $library = libraries_detect('example_unsupported_version');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
     $this->assertEqual($library['error'], 'not supported', 'Unsupported version detected as such.');
-    $error_message = t('The installed version %version of the %library library is not supported.', array(
+    $error_message = t('The installed version %version of the %library library is not supported.', [
       '%version' => $library['version'],
       '%library' => $library['name'],
-    ));
+    ]);
     $this->assertEqual($library['error message'], $error_message, 'Correct error message for a library with an unsupported version.');
 
     // Test supported library version.
@@ -228,21 +230,21 @@ class LibrariesWebTest extends WebTestBase {
 
     // Test a top-level files property.
     $library = libraries_detect('example_files');
-    $files = array(
-      'js' => array('example_1.js' => array()),
-      'css' => array('example_1.css' => array()),
-      'php' => array('example_1.php' => array()),
-    );
+    $files = [
+      'js' => ['example_1.js' => []],
+      'css' => ['example_1.css' => []],
+      'php' => ['example_1.php' => []],
+    ];
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
     $this->assertEqual($library['files'], $files, 'Top-level files property works.');
 
     // Test version-specific library files.
     $library = libraries_detect('example_versions');
-    $files = array(
-      'js' => array('example_2.js' => array()),
-      'css' => array('example_2.css' => array()),
-      'php' => array('example_2.php' => array()),
-    );
+    $files = [
+      'js' => ['example_2.js' => []],
+      'css' => ['example_2.css' => []],
+      'php' => ['example_2.php' => []],
+    ];
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
     $this->assertEqual($library['files'], $files, 'Version-specific library files found.');
 
@@ -250,10 +252,10 @@ class LibrariesWebTest extends WebTestBase {
     $library = libraries_detect('example_variant_missing');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
     $this->assertEqual($library['variants']['example_variant']['error'], 'not found', 'Missing variant not found');
-    $error_message = t('The %variant variant of the %library library could not be found.', array(
+    $error_message = t('The %variant variant of the %library library could not be found.', [
       '%variant' => 'example_variant',
       '%library' => 'Example variant missing',
-    ));
+    ]);
     $this->assertEqual($library['variants']['example_variant']['error message'], $error_message, 'Correct error message for a missing variant.');
 
     // Test existing variant.
@@ -267,7 +269,7 @@ class LibrariesWebTest extends WebTestBase {
    *
    * @todo Remove or rewrite to accomodate integration with core Libraries.
    */
-  function _testLibrariesLoad() {
+  public function _testLibrariesLoad() {
     // Test dependencies.
     $library = libraries_load('example_dependency_missing');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
@@ -286,52 +288,52 @@ class LibrariesWebTest extends WebTestBase {
   /**
    * Tests the applying of callbacks.
    */
-  function testCallbacks() {
-    $expected = array(
+  public function testCallbacks() {
+    $expected = [
       'name' => 'Example callback',
       'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
       'version' => '1',
-      'versions' => array(
-        '1' => array(
-          'variants' => array(
-            'example_variant' => array(
+      'versions' => [
+        '1' => [
+          'variants' => [
+            'example_variant' => [
               'info callback' => 'not applied',
               'pre-detect callback' => 'not applied',
               'post-detect callback' => 'not applied',
               'pre-load callback' => 'not applied',
               'post-load callback' => 'not applied',
-            ),
-          ),
+            ],
+          ],
           'info callback' => 'not applied',
           'pre-detect callback' => 'not applied',
           'post-detect callback' => 'not applied',
           'pre-load callback' => 'not applied',
           'post-load callback' => 'not applied',
-        ),
-      ),
-      'variants' => array(
-        'example_variant' => array(
+        ],
+      ],
+      'variants' => [
+        'example_variant' => [
           'info callback' => 'not applied',
           'pre-detect callback' => 'not applied',
           'post-detect callback' => 'not applied',
           'pre-load callback' => 'not applied',
           'post-load callback' => 'not applied',
-        ),
-      ),
-      'callbacks' => array(
-        'info' => array('_libraries_test_info_callback'),
-        'pre-detect' => array('_libraries_test_pre_detect_callback'),
-        'post-detect' => array('_libraries_test_post_detect_callback'),
-        'pre-load' => array('_libraries_test_pre_load_callback'),
-        'post-load' => array('_libraries_test_post_load_callback'),
-      ),
+        ],
+      ],
+      'callbacks' => [
+        'info' => ['_libraries_test_info_callback'],
+        'pre-detect' => ['_libraries_test_pre_detect_callback'],
+        'post-detect' => ['_libraries_test_post_detect_callback'],
+        'pre-load' => ['_libraries_test_pre_load_callback'],
+        'post-load' => ['_libraries_test_post_load_callback'],
+      ],
       'info callback' => 'not applied',
       'pre-detect callback' => 'not applied',
       'post-detect callback' => 'not applied',
       'pre-load callback' => 'not applied',
       'post-load callback' => 'not applied',
       'module' => 'libraries_test',
-    );
+    ];
     libraries_info_defaults($expected, 'example_callback');
 
     // Test a callback in the 'info' group.
@@ -398,7 +400,7 @@ class LibrariesWebTest extends WebTestBase {
    * @todo Remove or rewrite to accomodate integration with core Libraries.
    * @see _libraries_test_load()
    */
-  function _testLibrariesOutput() {
+  public function _testLibrariesOutput() {
     // Test loading of a simple library with a top-level files property.
     $this->drupalGet('libraries_test/files');
     $this->assertLibraryFiles('example_1', 'File loading');
@@ -463,38 +465,38 @@ class LibrariesWebTest extends WebTestBase {
    *   (optional) The expected file extensions of $name. Defaults to
    *   array('js', 'css', 'php').
    */
-  function assertLibraryFiles($name, $label = '', $extensions = array('js', 'css', 'php')) {
+  public function assertLibraryFiles($name, $label = '', $extensions = ['js', 'css', 'php']) {
     $label = ($label !== '' ? "$label: " : '');
 
     // Test that the wrong files are not loaded...
-    $names = array(
+    $names = [
       'example_1' => FALSE,
       'example_2' => FALSE,
       'example_3' => FALSE,
       'example_4' => FALSE,
-    );
+    ];
     // ...and the correct ones are.
     $names[$name] = TRUE;
 
     // Test for the specific HTML that the different file types appear as in the
     // DOM.
-    $html = array(
-      'js' => array('<script src="', '"></script>'),
-      'css' => array('<link rel="stylesheet" href="', '" media="all" />'),
+    $html = [
+      'js' => ['<script src="', '"></script>'],
+      'css' => ['<link rel="stylesheet" href="', '" media="all" />'],
       // PHP files do not get added to the DOM directly.
       // @see _libraries_test_load()
-      'php' => array('<li>', '</li>'),
-    );
+      'php' => ['<li>', '</li>'],
+    ];
 
-    $html_expected = array();
-    $html_not_expected = array();
+    $html_expected = [];
+    $html_not_expected = [];
 
     foreach ($names as $name => $expected) {
       foreach ($extensions as $extension) {
         $filepath = drupal_get_path('module', 'libraries') . "/tests/example/$name.$extension";
         // JavaScript and CSS files appear as full URLs and with an appended
         // query string.
-        if (in_array($extension, array('js', 'css'))) {
+        if (in_array($extension, ['js', 'css'])) {
           $filepath = $this->urlAssembler->assemble("base://$filepath", [
             'query' => [
               $this->state->get('system.css_js_query_string') ?: '0' => NULL,
@@ -502,7 +504,7 @@ class LibrariesWebTest extends WebTestBase {
             'absolute' => TRUE,
           ]);
           // If index.php is part of the generated URLs, we need to strip it.
-          //$filepath = str_replace('index.php/', '', $filepath);
+          // $filepath = str_replace('index.php/', '', $filepath);
         }
         list($prefix, $suffix) = $html[$extension];
         $raw = $prefix . $filepath . $suffix;
diff --git a/tests/modules/libraries_test/libraries_test.module b/tests/modules/libraries_test/libraries_test.module
index af1a4ac39a4c01a76cd561e1362c11d76af49e02..2f6ee0e369022c39fe4330ad7aed91a36109ded6 100644
--- a/tests/modules/libraries_test/libraries_test.module
+++ b/tests/modules/libraries_test/libraries_test.module
@@ -13,277 +13,277 @@ use Drupal\Core\Messenger\MessengerTrait;
  */
 function libraries_test_libraries_info() {
   // Test library detection.
-  $libraries['example_missing'] = array(
+  $libraries['example_missing'] = [
     'name' => 'Example missing',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/missing',
-  );
-  $libraries['example_undetected_version'] = array(
+  ];
+  $libraries['example_undetected_version'] = [
     'name' => 'Example undetected version',
     'library path' => drupal_get_path('module', 'libraries') . '/tests',
     'version callback' => '_libraries_test_return_version',
-    'version arguments' => array(FALSE),
-  );
-  $libraries['example_unsupported_version'] = array(
+    'version arguments' => [FALSE],
+  ];
+  $libraries['example_unsupported_version'] = [
     'name' => 'Example unsupported version',
     'library path' => drupal_get_path('module', 'libraries') . '/tests',
     'version callback' => '_libraries_test_return_version',
-    'version arguments' => array('1'),
-    'versions' => array(
-      '2' => array(),
-    ),
-  );
+    'version arguments' => ['1'],
+    'versions' => [
+      '2' => [],
+    ],
+  ];
 
-  $libraries['example_supported_version'] = array(
+  $libraries['example_supported_version'] = [
     'name' => 'Example supported version',
     'library path' => drupal_get_path('module', 'libraries') . '/tests',
     'version callback' => '_libraries_test_return_version',
-    'version arguments' => array('1'),
-    'versions' => array(
-      '1' => array(),
-    ),
-  );
+    'version arguments' => ['1'],
+    'versions' => [
+      '1' => [],
+    ],
+  ];
 
   // Test the default version callback.
-  $libraries['example_default_version_callback'] = array(
+  $libraries['example_default_version_callback'] = [
     'name' => 'Example default version callback',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
-    'version arguments' => array(
+    'version arguments' => [
       'file' => 'README.txt',
       // Version 1
       'pattern' => '/Version (\d+)/',
       'lines' => 5,
-    ),
-  );
+    ],
+  ];
 
   // Test a multiple-parameter version callback.
-  $libraries['example_multiple_parameter_version_callback'] = array(
+  $libraries['example_multiple_parameter_version_callback'] = [
     'name' => 'Example multiple parameter version callback',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     // Version 1
     'version callback' => '_libraries_test_get_version',
-    'version arguments' => array('README.txt', '/Version (\d+)/', 5),
-  );
+    'version arguments' => ['README.txt', '/Version (\d+)/', 5],
+  ];
 
   // Test a top-level files property.
-  $libraries['example_files'] = array(
+  $libraries['example_files'] = [
     'name' => 'Example files',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     'version' => '1',
-    'files' => array(
-      'js' => array('example_1.js'),
-      'css' => array('example_1.css'),
-      'php' => array('example_1.php'),
-    ),
-  );
+    'files' => [
+      'js' => ['example_1.js'],
+      'css' => ['example_1.css'],
+      'php' => ['example_1.php'],
+    ],
+  ];
 
   // Test loading of integration files.
   // Normally added by the corresponding module via hook_libraries_info_alter(),
   // these files should be automatically loaded when the library is loaded.
-  $libraries['example_integration_files'] = array(
+  $libraries['example_integration_files'] = [
     'name' => 'Example integration files',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     'version' => '1',
-    'integration files' => array(
-      'libraries_test' => array(
-        'js' => array('libraries_test.js'),
-        'css' => array('libraries_test.css'),
-        'php' => array('libraries_test.inc'),
-      ),
-    ),
-  );
+    'integration files' => [
+      'libraries_test' => [
+        'js' => ['libraries_test.js'],
+        'css' => ['libraries_test.css'],
+        'php' => ['libraries_test.inc'],
+      ],
+    ],
+  ];
 
   // Test version overloading.
-  $libraries['example_versions'] = array(
+  $libraries['example_versions'] = [
     'name' => 'Example versions',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     'version' => '2',
-    'versions' => array(
-      '1' => array(
-        'files' => array(
-          'js' => array('example_1.js'),
-          'css' => array('example_1.css'),
-          'php' => array('example_1.php'),
-        ),
-      ),
-      '2' => array(
-        'files' => array(
-          'js' => array('example_2.js'),
-          'css' => array('example_2.css'),
-          'php' => array('example_2.php'),
-        ),
-      ),
-    ),
-  );
+    'versions' => [
+      '1' => [
+        'files' => [
+          'js' => ['example_1.js'],
+          'css' => ['example_1.css'],
+          'php' => ['example_1.php'],
+        ],
+      ],
+      '2' => [
+        'files' => [
+          'js' => ['example_2.js'],
+          'css' => ['example_2.css'],
+          'php' => ['example_2.php'],
+        ],
+      ],
+    ],
+  ];
 
   // Test variant detection.
-  $libraries['example_variant_missing'] = array(
+  $libraries['example_variant_missing'] = [
     'name' => 'Example variant missing',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     'version' => '1',
-    'variants' => array(
-      'example_variant' => array(
-        'files' => array(
-          'js' => array('example_3.js'),
-          'css' => array('example_3.css'),
-          'php' => array('example_3.php'),
-        ),
+    'variants' => [
+      'example_variant' => [
+        'files' => [
+          'js' => ['example_3.js'],
+          'css' => ['example_3.css'],
+          'php' => ['example_3.php'],
+        ],
         'variant callback' => '_libraries_test_return_installed',
-        'variant arguments' => array(FALSE),
-      ),
-    ),
-  );
+        'variant arguments' => [FALSE],
+      ],
+    ],
+  ];
 
-  $libraries['example_variant'] = array(
+  $libraries['example_variant'] = [
     'name' => 'Example variant',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     'version' => '1',
-    'variants' => array(
-      'example_variant' => array(
-        'files' => array(
-          'js' => array('example_3.js'),
-          'css' => array('example_3.css'),
-          'php' => array('example_3.php'),
-        ),
+    'variants' => [
+      'example_variant' => [
+        'files' => [
+          'js' => ['example_3.js'],
+          'css' => ['example_3.css'],
+          'php' => ['example_3.php'],
+        ],
         'variant callback' => '_libraries_test_return_installed',
-        'variant arguments' => array(TRUE),
-      ),
-    ),
-  );
+        'variant arguments' => [TRUE],
+      ],
+    ],
+  ];
 
   // Test correct behaviour with multiple versions and multiple variants.
-  $libraries['example_versions_and_variants'] = array(
+  $libraries['example_versions_and_variants'] = [
     'name' => 'Example versions and variants',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     'version' => '2',
-    'versions' => array(
-      '1' => array(
-        'variants' => array(
-          'example_variant_1' => array(
-            'files' => array(
-              'js' => array('example_1.js'),
-              'css' => array('example_1.css'),
-              'php' => array('example_1.php'),
-            ),
+    'versions' => [
+      '1' => [
+        'variants' => [
+          'example_variant_1' => [
+            'files' => [
+              'js' => ['example_1.js'],
+              'css' => ['example_1.css'],
+              'php' => ['example_1.php'],
+            ],
             'variant callback' => '_libraries_test_return_installed',
-            'variant arguments' => array(TRUE),
-          ),
-          'example_variant_2' => array(
-            'files' => array(
-              'js' => array('example_2.js'),
-              'css' => array('example_2.css'),
-              'php' => array('example_2.php'),
-            ),
+            'variant arguments' => [TRUE],
+          ],
+          'example_variant_2' => [
+            'files' => [
+              'js' => ['example_2.js'],
+              'css' => ['example_2.css'],
+              'php' => ['example_2.php'],
+            ],
             'variant callback' => '_libraries_test_return_installed',
-            'variant arguments' => array(TRUE),
-          ),
-        ),
-      ),
-      '2' => array(
-        'variants' => array(
-          'example_variant_1' => array(
-            'files' => array(
-              'js' => array('example_3.js'),
-              'css' => array('example_3.css'),
-              'php' => array('example_3.php'),
-            ),
+            'variant arguments' => [TRUE],
+          ],
+        ],
+      ],
+      '2' => [
+        'variants' => [
+          'example_variant_1' => [
+            'files' => [
+              'js' => ['example_3.js'],
+              'css' => ['example_3.css'],
+              'php' => ['example_3.php'],
+            ],
             'variant callback' => '_libraries_test_return_installed',
-            'variant arguments' => array(TRUE),
-          ),
-          'example_variant_2' => array(
-            'files' => array(
-              'js' => array('example_4.js'),
-              'css' => array('example_4.css'),
-              'php' => array('example_4.php'),
-            ),
+            'variant arguments' => [TRUE],
+          ],
+          'example_variant_2' => [
+            'files' => [
+              'js' => ['example_4.js'],
+              'css' => ['example_4.css'],
+              'php' => ['example_4.php'],
+            ],
             'variant callback' => '_libraries_test_return_installed',
-            'variant arguments' => array(TRUE),
-          ),
-        ),
-      ),
-    ),
-  );
+            'variant arguments' => [TRUE],
+          ],
+        ],
+      ],
+    ],
+  ];
 
   // Test dependency loading.
   // We add one file to each library to be able to verify if it was loaded with
   // libraries_load().
   // This library acts as a dependency for the libraries below.
-  $libraries['example_dependency'] = array(
+  $libraries['example_dependency'] = [
     'name' => 'Example dependency',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     'version' => '1.1',
-    'files' => array('js' => array('example_1.js')),
-  );
-  $libraries['example_dependency_missing'] = array(
+    'files' => ['js' => ['example_1.js']],
+  ];
+  $libraries['example_dependency_missing'] = [
     'name' => 'Example dependency missing',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     'version' => '1',
-    'dependencies' => array('example_missing'),
-    'files' => array('js' => array('example_1.js')),
-  );
-  $libraries['example_dependency_incompatible'] = array(
+    'dependencies' => ['example_missing'],
+    'files' => ['js' => ['example_1.js']],
+  ];
+  $libraries['example_dependency_incompatible'] = [
     'name' => 'Example dependency incompatible',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     'version' => '1',
-    'dependencies' => array('example_dependency (>1.1)'),
-    'files' => array('js' => array('example_1.js')),
-  );
-  $libraries['example_dependency_compatible'] = array(
+    'dependencies' => ['example_dependency (>1.1)'],
+    'files' => ['js' => ['example_1.js']],
+  ];
+  $libraries['example_dependency_compatible'] = [
     'name' => 'Example dependency compatible',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     'version' => '1',
-    'dependencies' => array('example_dependency (>=1.1)'),
-    'files' => array('js' => array('example_1.js')),
-  );
+    'dependencies' => ['example_dependency (>=1.1)'],
+    'files' => ['js' => ['example_1.js']],
+  ];
 
   // Test the applying of callbacks.
-  $libraries['example_callback'] = array(
+  $libraries['example_callback'] = [
     'name' => 'Example callback',
     'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
     'version' => '1',
-    'versions' => array(
-      '1' => array(
-        'variants' => array(
-          'example_variant' => array(
+    'versions' => [
+      '1' => [
+        'variants' => [
+          'example_variant' => [
             // These keys are for testing purposes only.
             'info callback' => 'not applied',
             'pre-detect callback' => 'not applied',
             'post-detect callback' => 'not applied',
             'pre-load callback' => 'not applied',
             'post-load callback' => 'not applied',
-          ),
-        ),
+          ],
+        ],
         // These keys are for testing purposes only.
         'info callback' => 'not applied',
         'pre-detect callback' => 'not applied',
         'post-detect callback' => 'not applied',
         'pre-load callback' => 'not applied',
         'post-load callback' => 'not applied',
-      ),
-    ),
-    'variants' => array(
-      'example_variant' => array(
+      ],
+    ],
+    'variants' => [
+      'example_variant' => [
         // These keys are for testing purposes only.
         'info callback' => 'not applied',
         'pre-detect callback' => 'not applied',
         'post-detect callback' => 'not applied',
         'pre-load callback' => 'not applied',
         'post-load callback' => 'not applied',
-      ),
-    ),
-    'callbacks' => array(
-      'info' => array('_libraries_test_info_callback'),
-      'pre-detect' => array('_libraries_test_pre_detect_callback'),
-      'post-detect' => array('_libraries_test_post_detect_callback'),
-      'pre-load' => array('_libraries_test_pre_load_callback'),
-      'post-load' => array('_libraries_test_post_load_callback'),
-    ),
+      ],
+    ],
+    'callbacks' => [
+      'info' => ['_libraries_test_info_callback'],
+      'pre-detect' => ['_libraries_test_pre_detect_callback'],
+      'post-detect' => ['_libraries_test_post_detect_callback'],
+      'pre-load' => ['_libraries_test_pre_load_callback'],
+      'post-load' => ['_libraries_test_post_load_callback'],
+    ],
     // These keys are for testing purposes only.
     'info callback' => 'not applied',
     'pre-detect callback' => 'not applied',
     'post-detect callback' => 'not applied',
     'pre-load callback' => 'not applied',
     'post-load callback' => 'not applied',
-  );
+  ];
 
   return $libraries;
 }
@@ -292,7 +292,7 @@ function libraries_test_libraries_info() {
  * Implements hook_libraries_info_file_paths()
  */
 function libraries_test_libraries_info_file_paths() {
-  return array(drupal_get_path('module', 'libraries') . '/tests/example');
+  return [drupal_get_path('module', 'libraries') . '/tests/example'];
 }
 
 /**
@@ -470,29 +470,29 @@ function _libraries_test_callback(&$library, $version, $variant, $group) {
  * Implements hook_menu().
  */
 function libraries_test_menu() {
-  $items['libraries_test/files'] = array(
+  $items['libraries_test/files'] = [
     'title' => 'Test files',
     'route_name' => 'libraries_test_files',
-  );
-  $items['libraries_test/integration_files'] = array(
+  ];
+  $items['libraries_test/integration_files'] = [
     'title' => 'Test integration files',
     'route_name' => 'libraries_test_integration_files',
-  );
-  $items['libraries_test/versions'] = array(
+  ];
+  $items['libraries_test/versions'] = [
     'title' => 'Test version loading',
     'route_name' => 'libraries_test_versions',
-  );
-  $items['libraries_test/variant'] = array(
+  ];
+  $items['libraries_test/variant'] = [
     'title' => 'Test variant loading',
     'route_name' => 'libraries_test_variant',
-  );
-  $items['libraries_test/versions_and_variants'] = array(
+  ];
+  $items['libraries_test/versions_and_variants'] = [
     'title' => 'Test concurrent version and variant loading',
     'route_name' => 'libraries_test_versions_and_variants',
-  );
-  $items['libraries_test/cache'] = array(
+  ];
+  $items['libraries_test/cache'] = [
     'title' => 'Test caching of library information',
     'route_name' => 'libraries_test_cache',
-  );
+  ];
   return $items;
 }