maint(Build): Remove the IE11 polyfills-loader.

Clear out the polyfills-loader script but keep the module for backwards
compatibility. No IE11 compatibility polyfills are included anymore as
support for IE11 has recently really and finally dropped. The
polyfills-loader.js file is still shipped but empty for compatibility
with projects including the polyfills loader.

Author: thet

package.json

@@ -12,13 +12,11 @@
         "@fullcalendar/list": "^5.11.3",
         "@fullcalendar/luxon2": "^5.11.3",
         "@fullcalendar/timegrid": "^5.11.3",
-        "@juggle/resize-observer": "^3.4.0",
         "@stomp/stompjs": "^6.1.2",
         "dompurify": "^2.4.1",
         "google-code-prettify": "^1.0.5",
         "highlight.js": "<11",
         "imagesloaded": "^4.1.4",
-        "intersection-observer": "^0.12.2",
         "jquery": "^3.6.1",
         "jquery-jcrop": "^0.9.13",
         "luxon": "2.4.0",
@@ -30,17 +28,14 @@
         "pikaday": "^1.8.0",
         "prettier": "^2.8.0",
         "prismjs": "^1.29.0",
-        "promise-polyfill": "^8.2.3",
         "screenfull": "^6.0.2",
         "select2": "^3.5.1",
         "showdown": "^2.1.0",
         "showdown-prettify": "^1.3.0",
         "slick-carousel": "^1.8.1",
         "slides": "git+https://github.com/Patternslib/slides.git",
         "spectrum-colorpicker": "^1.8.0",
-        "tippy.js": "^6.3.7",
-        "url-polyfill": "^1.1.9",
-        "whatwg-fetch": "^3.4.0"
+        "tippy.js": "^6.3.7"
     },
     "devDependencies": {
         "@patternslib/dev": "^3.1.5",

src/polyfills-loader.js

@@ -1,26 +1,2 @@
-var script_source = function () {
-    // See: https://stackoverflow.com/a/984656/1337474
-    var scripts = document.getElementsByTagName("script");
-    var script = scripts[scripts.length - 1];
-
-    if (script.getAttribute.length !== undefined) {
-        return script.src;
-    }
-
-    // Some IE quirks
-    return script.getAttribute("src", -1);
-};
-
-(function () {
-    // https://stackoverflow.com/a/8578840/1337474
-    // if IE
-    if (/*@cc_on!@*/ false || !!document.documentMode) {
-        var script_url = script_source();
-        script_url = script_url.substring(0, script_url.lastIndexOf("/")) + "/";
-
-        var script_tag = document.createElement("script");
-        script_tag.type = "text/javascript";
-        script_tag.src = script_url + "bundle-polyfills.min.js";
-        document.getElementsByTagName("head")[0].appendChild(script_tag);
-    }
-})();
+// TODO: REMOVE with next major release
+// BBB backwards compatibility

src/polyfills.js

@@ -10,7 +10,6 @@ module.exports = () => {
     let config = {
         entry: {
             "bundle.min": path.resolve(__dirname, "../src/index.js"),
-            "bundle-polyfills.min": path.resolve(__dirname, "../src/polyfills.js"),
         },
     };