updated javascript dependencies and changed 'theme' to a constant in zulma_switchcss

javascript/package.json

@@ -1,16 +1,16 @@
 {
   "devDependencies": {
-    "@babel/core": "^7.4.4",
-    "@babel/preset-env": "^7.4.4",
-    "babel-loader": "^8.0.5",
-    "eslint": "^5.16.0",
-    "eslint-config-standard": "^12.0.0",
-    "eslint-loader": "^2.1.2",
-    "eslint-plugin-import": "^2.17.2",
-    "eslint-plugin-node": "^9.0.1",
-    "eslint-plugin-promise": "^4.1.1",
-    "eslint-plugin-standard": "^4.0.0",
-    "webpack": "^4.30.0",
-    "webpack-cli": "^3.3.2"
+    "@babel/core": "^7.6.4",
+    "@babel/preset-env": "^7.6.3",
+    "babel-loader": "^8.0.6",
+    "eslint": "^6.6.0",
+    "eslint-config-standard": "^14.1.0",
+    "eslint-loader": "^3.0.2",
+    "eslint-plugin-import": "^2.18.2",
+    "eslint-plugin-node": "^10.0.0",
+    "eslint-plugin-promise": "^4.2.1",
+    "eslint-plugin-standard": "^4.0.1",
+    "webpack": "^4.41.2",
+    "webpack-cli": "^3.3.9"
   }
 }

javascript/src/zulma_switchcss.js

@@ -1,12 +1,12 @@
 (function(switch_css) {
   //Constants
   const THEME_KEY = "ZULMA_THEME";
+  const THEME = localStorage.getItem(THEME_KEY);
   const STOP_BLINK_CSS_ID = "stop-blink";
   const STYLESHEET_CLASSNAME = "stylesheet";
 
   //Variables
   let previousLink = null;
-  let theme = localStorage.getItem(THEME_KEY);
 
   //Events
   /* The function called when the css has finished loading */
@@ -143,13 +143,13 @@
   //Public Methods
   switch_css.init = function() {
     //if user has selected and theme and it is not the current theme
-    if (theme && !document.getElementById(theme)) {
+    if (THEME && !document.getElementById(THEME)) {
       //hide the body to stop FOUC
       hideBody();
       //change the theme
-      changeTheme(theme, true);
+      changeTheme(THEME, true);
       //when the DOM is loaded, change the select to their current choice
-      updateThemeSelect(theme, true);
+      updateThemeSelect(THEME, true);
     }
     //when the DOM is loaded, set the dropdown to trigger the theme change
     window.addEventListener("DOMContentLoaded", () => {