Migrate JS to ES6

package-lock.json

@@ -805,6 +805,23 @@
         "semver": "^5.5.0"
       }
     },
+    "@babel/runtime": {
+      "version": "7.6.2",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.6.2.tgz",
+      "integrity": "sha512-EXxN64agfUqqIGeEjI5dL5z0Sw0ZwWo1mLTi4mQowCZ42O59b7DRpZAnTC6OqdF28wMBMFKNb/4uFGrVaigSpg==",
+      "dev": true,
+      "requires": {
+        "regenerator-runtime": "^0.13.2"
+      },
+      "dependencies": {
+        "regenerator-runtime": {
+          "version": "0.13.3",
+          "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.13.3.tgz",
+          "integrity": "sha512-naKIZz2GQ8JWh///G7L3X6LaQUAMp2lvb1rvwwsURe/VXwD6VMfr+/1NuNw3ag8v2kY1aQ/go5SNn79O9JU7yw==",
+          "dev": true
+        }
+      }
+    },
     "@babel/template": {
       "version": "7.6.0",
       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.6.0.tgz",

package.json

@@ -11,6 +11,7 @@
   "author": "Daniel Vassallo",
   "license": "MIT",
   "devDependencies": {
+    "@babel/runtime": "^7.4.5",
     "@babel/cli": "^7.4.4",
     "@babel/core": "^7.4.5",
     "@babel/plugin-transform-runtime": "^7.4.4",

src/index.js

@@ -1,32 +1,14 @@
 import './style.css'
 
-var serialize = function (form) {
-  var serialized = ''
-
-  for (var i = 0; i < form.elements.length; i++) {
-
-    var field = form.elements[i]
-
-    if (!field.name || field.disabled || field.type === 'file' || field.type === 'reset' || field.type === 'submit' || field.type === 'button') continue
-
-    if ((field.type !== 'checkbox' && field.type !== 'radio') || field.checked) {
-      serialized += '&' + encodeURIComponent(field.name) + "=" + encodeURIComponent(field.value)
-    }
-  }
-
-  return serialized;
-}
-
 window.displayMailChimpStatus = function (data) {
   if (!data.result || !data.msg) return
 
-  var mcStatus = document.querySelector('.mc-status')
+  const mcStatus = document.querySelector('.mc-status')
 
   if (!mcStatus) return
 
   mcStatus.innerHTML = data.msg
 
-  //mcStatus.addAttribute('tabindex', '-1')
   mcStatus.focus()
 
   mcStatus.classList.remove('hidden')
@@ -41,15 +23,32 @@ window.displayMailChimpStatus = function (data) {
   mcStatus.classList.add('mc-success')
 }
 
-var submitMailChimpForm = function (form) {
-  var url = form.getAttribute('action')
+const serialize = function (form) {
+  let serialized = ''
+
+  for (let i = 0; i < form.elements.length; i++) {
+
+    const field = form.elements[i]
+
+    if (!field.name || field.disabled || field.type === 'file' || field.type === 'reset' || field.type === 'submit' || field.type === 'button') continue
+
+    if ((field.type !== 'checkbox' && field.type !== 'radio') || field.checked) {
+      serialized += '&' + encodeURIComponent(field.name) + "=" + encodeURIComponent(field.value)
+    }
+  }
+
+  return serialized;
+}
+
+const submitMailChimpForm = function (form) {
+  let url = form.getAttribute('action')
   url = url.replace('/post?u=', '/post-json?u=')
   url += serialize(form) + '&c=displayMailChimpStatus'
 
-  var script = window.document.createElement('script')
+  const script = window.document.createElement('script')
   script.src = url
 
-  var ref = window.document.getElementsByTagName('script')[0]
+  const ref = window.document.getElementsByTagName('script')[0]
   ref.parentNode.insertBefore(script, ref)
 
   script.onload = function () {