diff --git a/dist/plugin/notes.js b/dist/plugin/notes.js
index 16972172..530cc89e 100644
--- a/dist/plugin/notes.js
+++ b/dist/plugin/notes.js
@@ -1 +1 @@
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self).RevealNotes=t()}(this,(function(){"use strict";var e=function(){var e,t=null;function n(n){var o;!t||t.closed?(n||(n="plugin/notes/notes.html"),(t=window.open(n,"reveal.js - Notes","width=1100,height=700"))?(o=setInterval((function(){t.postMessage(JSON.stringify({namespace:"reveal-notes",type:"connect",url:window.location.protocol+"//"+window.location.host+window.location.pathname+window.location.search,state:e.getState()}),"*")}),500),window.addEventListener("message",(function(n){var s,r,i,d,c=JSON.parse(n.data);c&&"reveal-notes"===c.namespace&&"connected"===c.type&&(clearInterval(o),e.on("slidechanged",a),e.on("fragmentshown",a),e.on("fragmenthidden",a),e.on("overviewhidden",a),e.on("overviewshown",a),e.on("paused",a),e.on("resumed",a),a()),c&&"reveal-notes"===c.namespace&&"call"===c.type&&(s=c.methodName,r=c.arguments,i=c.callId,d=e[s].apply(e,r),t.postMessage(JSON.stringify({namespace:"reveal-notes",type:"return",result:d,callId:i}),"*"))}))):alert("Speaker view popup failed to open. Please make sure popups are allowed and reopen the speaker view.")):t.focus();function a(n){var o=e.getCurrentSlide(),a=o.querySelector("aside.notes"),s=o.querySelector(".current-fragment"),r={namespace:"reveal-notes",type:"state",notes:"",markdown:!1,whitespace:"normal",state:e.getState()};if(o.hasAttribute("data-notes")&&(r.notes=o.getAttribute("data-notes"),r.whitespace="pre-wrap"),s){var i=s.querySelector("aside.notes");i?a=i:s.hasAttribute("data-notes")&&(r.notes=s.getAttribute("data-notes"),r.whitespace="pre-wrap",a=null)}a&&(r.notes=a.innerHTML,r.markdown="string"==typeof a.getAttribute("data-markdown")),t.postMessage(JSON.stringify(r),"*")}}return{id:"notes",init:function(t){e=t,/receiver/i.test(window.location.search)||(null!==window.location.search.match(/(\?|\&)notes/gi)&&n(),e.addKeyBinding({keyCode:83,key:"S",description:"Speaker notes view"},(function(){n()})))},open:n}}();return function(){return e}}));
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self).RevealNotes=t()}(this,(function(){"use strict";return function(){var e,t=null;function n(n){var o;!t||t.closed?(n||(n="plugin/notes/notes.html"),(t=window.open(n,"reveal.js - Notes","width=1100,height=700"))?(o=setInterval((function(){t.postMessage(JSON.stringify({namespace:"reveal-notes",type:"connect",url:window.location.protocol+"//"+window.location.host+window.location.pathname+window.location.search,state:e.getState()}),"*")}),500),window.addEventListener("message",(function(n){var s,r,i,d,l=JSON.parse(n.data);l&&"reveal-notes"===l.namespace&&"connected"===l.type&&(clearInterval(o),e.on("slidechanged",a),e.on("fragmentshown",a),e.on("fragmenthidden",a),e.on("overviewhidden",a),e.on("overviewshown",a),e.on("paused",a),e.on("resumed",a),a()),l&&"reveal-notes"===l.namespace&&"call"===l.type&&(s=l.methodName,r=l.arguments,i=l.callId,d=e[s].apply(e,r),t.postMessage(JSON.stringify({namespace:"reveal-notes",type:"return",result:d,callId:i}),"*"))}))):alert("Speaker view popup failed to open. Please make sure popups are allowed and reopen the speaker view.")):t.focus();function a(n){var o=e.getCurrentSlide(),a=o.querySelector("aside.notes"),s=o.querySelector(".current-fragment"),r={namespace:"reveal-notes",type:"state",notes:"",markdown:!1,whitespace:"normal",state:e.getState()};if(o.hasAttribute("data-notes")&&(r.notes=o.getAttribute("data-notes"),r.whitespace="pre-wrap"),s){var i=s.querySelector("aside.notes");i?a=i:s.hasAttribute("data-notes")&&(r.notes=s.getAttribute("data-notes"),r.whitespace="pre-wrap",a=null)}a&&(r.notes=a.innerHTML,r.markdown="string"==typeof a.getAttribute("data-markdown")),t.postMessage(JSON.stringify(r),"*")}}return{id:"notes",init:function(t){e=t,/receiver/i.test(window.location.search)||(null!==window.location.search.match(/(\?|\&)notes/gi)&&n(),e.addKeyBinding({keyCode:83,key:"S",description:"Speaker notes view"},(function(){n()})))},open:n}}}));
diff --git a/plugin/highlight/highlight.js b/plugin/highlight/highlight.js
index 4dd9635b..4d93ba1c 100644
--- a/plugin/highlight/highlight.js
+++ b/plugin/highlight/highlight.js
@@ -5,7 +5,7 @@ import './highlight-line-numbers.js'
  * reveal.js plugin that adds syntax highlight support.
  */
 
-let Plugin = {
+const Plugin = {
 
 	id: 'highlight',
 
diff --git a/plugin/notes/notes.js b/plugin/notes/notes.js
index b4bbbc2f..8af8ff01 100644
--- a/plugin/notes/notes.js
+++ b/plugin/notes/notes.js
@@ -9,7 +9,7 @@
  * 3. This window proceeds to send the current presentation state
  *    to the notes window
  */
-let Plugin = (function() {
+const Plugin = () => {
 
     var notesPopup = null;
 
@@ -180,6 +180,6 @@ let Plugin = (function() {
 		open: openNotes
 	};
 
-})();
+};
 
-export default () => Plugin;
+export default Plugin;
diff --git a/plugin/zoom/zoom.js b/plugin/zoom/zoom.js
index a4de3f33..0d4624d6 100644
--- a/plugin/zoom/zoom.js
+++ b/plugin/zoom/zoom.js
@@ -1,7 +1,7 @@
 /*!
  * reveal.js Zoom plugin
  */
-var Plugin = {
+const Plugin = {
 
 	id: 'zoom',