Restore polyfill.io via cdnjs alternative

README.md

@@ -24,7 +24,8 @@ PHP-rendered classic web app powering the MLP Vector Club's website since 2015.
    [FileSaver.js](https://github.com/eligrey/FileSaver.js),
    [paste.js](https://github.com/layerssss/paste.js),
    [Draggable](https://github.com/Shopify/Draggable),
-   [cuid](https://github.com/ericelliott/cuid)
+   [cuid](https://github.com/ericelliott/cuid),
+   [Polyfill.io (cdnjs)](https://cdnjs.cloudflare.com/polyfill/)
  - Back-end:
    [moment.php](https://github.com/fightbulc/moment.php),
    [PostgresDb](https://github.com/SeinopSys/PHP-PostgreSQL-Database-Class),

app/CoreUtils.php

@@ -241,7 +241,7 @@ public static function roleGate(string $role = 'developer') {
     'websocket',
   ];
   public const DEFAULT_LIBS = [
-    // 'polyfill-io',
+    'polyfill-io',
     'dragscroll',
     'jquery',
     'moment',

app/LibHelper.php

@@ -26,7 +26,7 @@ class LibHelper {
     'moment' => self::TYPE_JS,
     'no-ui-slider' => self::TYPE_JS_CSS,
     'paste' => self::TYPE_JS,
-    // 'polyfill-io' => self::TYPE_JS,
+    'polyfill-io' => self::TYPE_JS,
     'react' => self::TYPE_JS,
     'sortable' => self::TYPE_JS,
     'typicons' => self::TYPE_CSS,

templates/layout/js_libs/_polyfill-io.html.twig

@@ -1,3 +1,3 @@
 {% set features = ['IntersectionObserver','HTMLCanvasElement.prototype.toBlob'] %}
 {% set min =  env('PRODUCTION') ? '.min' : '' %}
-<script src="https://polyfill.io/v2/polyfill{{ min }}.js?features={{ features | join(',') }}"></script>
+<script src="https://cdnjs.cloudflare.com/polyfill/v2/polyfill{{ min }}.js?features={{ features | join(',') }}"></script>