chore: Modernize JS build, remove jQuery bundle

Author: fsbraun

.babelrc

@@ -1,8 +1,8 @@
 {
     "presets": [
-        ["env", {
+        ["@babel/preset-env", {
             "modules": false
         }]
     ],
-    "plugins": ["transform-runtime", "syntax-dynamic-import"]
+    "plugins": ["@babel/plugin-syntax-dynamic-import"]
 }

.eslintrc.js

@@ -1 +1 @@
-16
+24

.nvmrc

@@ -0,0 +1,12 @@
+module.exports = {
+    presets: [
+        ['@babel/preset-env', {
+            targets: {
+                browsers: ['last 2 versions', '> 1%']
+            }
+        }]
+    ],
+    plugins: [
+        '@babel/plugin-syntax-dynamic-import'
+    ]
+};

babel.config.js

@@ -1,25 +1,29 @@
+const retryTime = 5000;
+const browserTime = 20;
+
 (function($) {
     if (!$) {
         return;
     }
 
     // Hide django messages after timeout occurs to prevent content overlap
-    $('document').ready(function(){
+    $('document').ready(function() {
         // Targeting first item returned (there's only ever one messagelist per template):
-        let messageList = document.getElementsByClassName("messagelist")[0];
-        if(messageList != undefined){
-          for(let item of messageList.children){
-            item.style.opacity = 1;
-            setTimeout(() => {
-              let fader = setInterval(() => {
-                item.style.opacity -= 0.05;
-                  if(item.style.opacity < 0) {
-                    item.style.display = "none";
-                    clearInterval(fader);
-                  }
-              }, 20);
-            }, 5000);
-          }
+        let messageList = document.getElementsByClassName('messagelist')[0];
+
+        if (messageList !== undefined) {
+            for (let item of messageList.children) {
+                item.style.opacity = 1;
+                setTimeout(() => {
+                    let fader = setInterval(() => {
+                        item.style.opacity -= 0.05;
+                        if (item.style.opacity < 0) {
+                            item.style.display = 'none';
+                            clearInterval(fader);
+                        }
+                    }, browserTime);
+                }, retryTime);
+            }
         }
     });
- })((typeof django !== 'undefined' && django.jQuery) || (typeof CMS !== 'undefined' && CMS.$) || false);
+})((typeof django !== 'undefined' && django.jQuery) || (typeof CMS !== 'undefined' && CMS.$) || false);