diff --git a/core/modules/color/color.module b/core/modules/color/color.module
index 7660d6b..f013572 100644
--- a/core/modules/color/color.module
+++ b/core/modules/color/color.module
@@ -246,7 +246,7 @@ function template_preprocess_color_scheme_form(&$variables) {
   // @todo Transform to add library.
   $preview_js_path = isset($info['preview_js']) ? $path . $info['preview_js'] : drupal_get_path('module', 'color') . '/' . 'preview.js';
   // Add the JS at a weight below color.js.
-  drupal_add_js($preview_js_path, array('weight' => -1));
+  drupal_add_js($preview_js_path);
 
   // Attempt to load preview HTML if the theme provides it.
   $preview_html_path = DRUPAL_ROOT . '/' . (isset($info['preview_html']) ? drupal_get_path('theme', $theme) . '/' . $info['preview_html'] : drupal_get_path('module', 'color') . '/preview.html');
diff --git a/core/modules/contextual/contextual.module b/core/modules/contextual/contextual.module
index 9280a7b..0273201 100644
--- a/core/modules/contextual/contextual.module
+++ b/core/modules/contextual/contextual.module
@@ -110,7 +110,7 @@ function contextual_library_info() {
     'js' => array(
       // Add the JavaScript, with a group and weight such that it will run
       // before modules/contextual/contextual.toolbar.js.
-      $path . '/contextual.js' => array('group' => JS_LIBRARY, 'weight' => -2),
+      $path . '/contextual.js' => array(),
     ),
     'css' => array(
       $path . '/css/contextual.module.css' => array(),
@@ -129,9 +129,7 @@ function contextual_library_info() {
     'title' => 'Contextual Links Toolbar Tab',
     'version' => VERSION,
     'js' => array(
-      // Add the JavaScript, with a group and weight such that it will run
-      // before modules/overlay/overlay-parent.js.
-      $path . '/contextual.toolbar.js' => array('group' => JS_LIBRARY, 'weight' => -1),
+      $path . '/contextual.toolbar.js' => array(),
     ),
     'css' => array(
       $path . '/css/contextual.toolbar.css' => array(),
diff --git a/core/modules/editor/editor.module b/core/modules/editor/editor.module
index af2b8ea..f044430 100644
--- a/core/modules/editor/editor.module
+++ b/core/modules/editor/editor.module
@@ -98,7 +98,7 @@ function editor_library_info() {
     'title' => 'Text Editor Dialog',
     'version' => VERSION,
     'js' => array(
-      $path . '/js/editor.dialog.js' => array('weight' => 2),
+      $path . '/js/editor.dialog.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
diff --git a/core/modules/picture/picture.module b/core/modules/picture/picture.module
index deba3b0..a2c3e92 100644
--- a/core/modules/picture/picture.module
+++ b/core/modules/picture/picture.module
@@ -89,7 +89,7 @@ function picture_library_info() {
     'website' => 'http://drupal.org/node/1775530',
     'version' => VERSION,
     'js' => array(
-      drupal_get_path('module', 'picture') . '/picturefill/picturefill.js' => array('type' => 'file', 'weight' => -10, 'group' => JS_DEFAULT),
+      drupal_get_path('module', 'picture') . '/picturefill/picturefill.js' => array('type' => 'file', 'group' => JS_DEFAULT),
     ),
     'dependencies' => array(
       array('system', 'matchmedia'),
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index a6a7786..6257036 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -1123,7 +1123,7 @@ function system_library_info() {
     'title' => 'Drupal',
     'version' => VERSION,
     'js' => array(
-      'core/misc/drupal.js' => array('group' => JS_LIBRARY, 'weight' => -18),
+      'core/misc/drupal.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'domready'),
@@ -1145,7 +1145,7 @@ function system_library_info() {
     'website' => 'http://api.drupal.org/api/group/ajax/8',
     'version' => VERSION,
     'js' => array(
-      'core/misc/ajax.js' => array('group' => JS_LIBRARY, 'weight' => 2),
+      'core/misc/ajax.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
@@ -1205,7 +1205,7 @@ function system_library_info() {
     'title' => 'Drupal form library',
     'version' => VERSION,
     'js' => array(
-      'core/misc/form.js' => array('group' => JS_LIBRARY, 'weight' => 1),
+      'core/misc/form.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
@@ -1220,10 +1220,10 @@ function system_library_info() {
     'title' => 'Drupal Dialog',
     'version' => VERSION,
     'js' => array(
-      'core/misc/dialog.js' => array('group' => JS_LIBRARY),
+      'core/misc/dialog.js' => array(),
     ),
     'css' => array(
-      'core/misc/dialog.theme.css' => array('weight' => 1),
+      'core/misc/dialog.theme.css' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
@@ -1239,7 +1239,7 @@ function system_library_info() {
     'title' => 'Drupal Dialog AJAX',
     'version' => VERSION,
     'js' => array(
-      'core/misc/dialog.ajax.js' => array('group' => JS_LIBRARY, 'weight' => 3),
+      'core/misc/dialog.ajax.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
@@ -1255,7 +1255,7 @@ function system_library_info() {
     'title' => 'Drupal states',
     'version' => VERSION,
     'js' => array(
-      'core/misc/states.js' => array('group' => JS_LIBRARY, 'weight' => 1),
+      'core/misc/states.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
@@ -1270,7 +1270,7 @@ function system_library_info() {
     'title' => 'Drupal tabledrag',
     'version' => VERSION,
     'js' => array(
-      'core/misc/tabledrag.js' => array('group' => JS_LIBRARY, 'weight' => -1),
+      'core/misc/tabledrag.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
@@ -1287,7 +1287,7 @@ function system_library_info() {
     'title' => 'Drupal responsive table API',
     'version' => VERSION,
     'js' => array(
-      'core/misc/tableresponsive.js' => array('group' => JS_LIBRARY),
+      'core/misc/tableresponsive.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
@@ -1334,7 +1334,7 @@ function system_library_info() {
     'title' => 'Drupal displace',
     'version' => VERSION,
     'js' => array(
-      'core/misc/displace.js' => array('group' => JS_LIBRARY),
+      'core/misc/displace.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
@@ -1348,7 +1348,7 @@ function system_library_info() {
     'title' => 'Drupal tabbing manager',
     'version' => VERSION,
     'js' => array(
-      'core/misc/tabbingmanager.js' => array('group' => JS_LIBRARY),
+      'core/misc/tabbingmanager.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
@@ -1363,7 +1363,7 @@ function system_library_info() {
     'title' => 'Drupal debounce',
     'version' => VERSION,
     'js' => array(
-      'core/misc/debounce.js' => array('group' => JS_LIBRARY),
+      'core/misc/debounce.js' => array(),
     ),
     'dependencies' => array(
       // @todo remove drupal dependency.
@@ -1377,7 +1377,7 @@ function system_library_info() {
     'website' => 'https://github.com/ded/domready',
     'version' => 'master',
     'js' => array(
-      'core/assets/vendor/domready/ready.min.js' => array('group' => JS_LIBRARY, 'weight' => -21),
+      'core/assets/vendor/domready/ready.min.js' => array(),
     ),
   );
 
@@ -1387,7 +1387,7 @@ function system_library_info() {
     'website' => 'http://jquery.com',
     'version' => '2.0',
     'js' => array(
-      'core/assets/vendor/jquery/jquery.js' => array('group' => JS_LIBRARY, 'weight' => -20),
+      'core/assets/vendor/jquery/jquery.js' => array(),
     ),
   );
 
@@ -1397,7 +1397,7 @@ function system_library_info() {
     'website' => 'http://plugins.jquery.com/project/once',
     'version' => '1.2',
     'js' => array(
-      'core/assets/vendor/jquery-once/jquery.once.js' => array('group' => JS_LIBRARY, 'weight' => -19),
+      'core/assets/vendor/jquery-once/jquery.once.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
@@ -1508,7 +1508,6 @@ function system_library_info() {
     'js' => array(
       'core/assets/vendor/html5shiv/html5.js' => array(
         'group' => JS_LIBRARY,
-        'weight' => -22,
         'browsers' => array('IE' => 'lte IE 8', '!IE' => FALSE),
       ),
     ),
@@ -1525,7 +1524,6 @@ function system_library_info() {
         'group' => JS_LIBRARY,
         'preprocess' => 0,
         'scope' => 'header',
-        'weight' => -21,
       ),
     ),
   );
@@ -1538,7 +1536,6 @@ function system_library_info() {
     'css' => array(
       'core/assets/vendor/normalize-css/normalize.css' => array(
         'every_page' => TRUE,
-        'weight' => -10,
       ),
     ),
   );
@@ -1549,7 +1546,7 @@ function system_library_info() {
     'website' => 'http://jqueryui.com',
     'version' => '1.10.2',
     'js' => array(
-      'core/assets/vendor/jquery.ui/ui/jquery.ui.core.js' => array('group' => JS_LIBRARY, 'weight' => -11),
+      'core/assets/vendor/jquery.ui/ui/jquery.ui.core.js' => array(),
     ),
     'css' => array(
       'core/assets/vendor/jquery.ui/themes/base/jquery.ui.core.css' => array(),
@@ -1826,7 +1823,7 @@ function system_library_info() {
     'website' => 'http://docs.jquery.com/UI/Widget',
     'version' => $libraries['jquery.ui.core']['version'],
     'js' => array(
-      'core/assets/vendor/jquery.ui/ui/jquery.ui.widget.js' => array('group' => JS_LIBRARY, 'weight' => -10),
+      'core/assets/vendor/jquery.ui/ui/jquery.ui.widget.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery.ui.core'),
@@ -1837,7 +1834,7 @@ function system_library_info() {
     'website' => 'http://jqueryui.com/demos/effect/',
     'version' => $libraries['jquery.ui.core']['version'],
     'js' => array(
-      'core/assets/vendor/jquery.ui/ui/jquery.effects.core.js' => array('group' => JS_LIBRARY, 'weight' => -9),
+      'core/assets/vendor/jquery.ui/ui/jquery.effects.core.js' => array(),
     ),
   );
   $libraries['jquery.effects.blind'] = array(
@@ -2003,7 +2000,7 @@ function system_library_info() {
     'website' => 'http://underscorejs.org/',
     'version' => '1.4.0',
     'js' => array(
-      'core/assets/vendor/underscore/underscore.js' => array('group' => JS_LIBRARY, 'weight' => -20),
+      'core/assets/vendor/underscore/underscore.js' => array(),
     ),
   );
 
@@ -2013,7 +2010,7 @@ function system_library_info() {
     'website' => 'http://backbonejs.org/',
     'version' => '0.9.2',
     'js' => array(
-      'core/assets/vendor/backbone/backbone.js' => array('group' => JS_LIBRARY, 'weight' => -19),
+      'core/assets/vendor/backbone/backbone.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'underscore'),
diff --git a/core/modules/tour/tour.module b/core/modules/tour/tour.module
index 48e44f6..8ac130f 100644
--- a/core/modules/tour/tour.module
+++ b/core/modules/tour/tour.module
@@ -30,7 +30,7 @@ function tour_library_info() {
     'js' => array(
       // Add the JavaScript, with a group and weight such that it will run
       // before modules/overlay/overlay-parent.js.
-      $path . '/js/tour.js' => array('group' => JS_LIBRARY, 'weight' => -1),
+      $path . '/js/tour.js' => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),
diff --git a/core/modules/views/views.module b/core/modules/views/views.module
index 85aecf9..b5cd231 100644
--- a/core/modules/views/views.module
+++ b/core/modules/views/views.module
@@ -823,7 +823,7 @@ function views_library_info() {
     'title' => 'Views Contextual links',
     'version' => VERSION,
     'js' => array(
-      "$path/js/views-contextual.js" => array('group' => JS_LIBRARY, 'weight' => -10),
+      "$path/js/views-contextual.js" => array(),
     ),
     'dependencies' => array(
       array('system', 'jquery'),