diff --git a/package.json b/package.json
index 859f612c856..4b78ec29745 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "start": "grunt serve",
     "build": "grunt",
     "webyarns:build:babel": "babel  --extensions '.ts,.js' webyarns-util/src -d webyarns-util/lib",
-    "webyarns:build:all": "uglifyjs-folder webyarns-util/lib  -e -o webyarns-util/lib/ --pattern \"*.js,!*.min.js\"  ",
+    "webyarns:build:all": "uglifyjs-folder webyarns-util/lib  -e -o webyarns-util/lib/ --pattern \"*.js,!*.min.js\" --config-file=uglify.json ",
     "webyarns:build": "npm-run-all webyarns:build:*",
     "webyarns:watch": "babel --extensions '.ts,.js'  webyarns-util/src -d webyarns-util/lib --watch --source-maps inline",
     "test-webyarns": "jest",
diff --git a/uglify.json b/uglify.json
new file mode 100644
index 00000000000..bf83ac2f593
--- /dev/null
+++ b/uglify.json
@@ -0,0 +1,5 @@
+{
+  "output": {
+    "preamble": "// version 3.8.0.4"
+  }
+}
diff --git a/webyarns-util/lib/audio-ios-initialiser.min.js b/webyarns-util/lib/audio-ios-initialiser.min.js
index 2158f79f6af..21096053086 100644
--- a/webyarns-util/lib/audio-ios-initialiser.min.js
+++ b/webyarns-util/lib/audio-ios-initialiser.min.js
@@ -1 +1,2 @@
+// version 3.8.0.4
 "use strict";!function(){function t(e){e.preventDefault(),document.querySelectorAll("audio").forEach(function(e){e.play().then(function(){return e.pause()})}),Reveal.next()}document.addEventListener("DOMContentLoaded",function(){console.log("Deprecated script: audio-ios-initialiser. Is no longer needed");var n=document.getElementById("ipad-audio-init");n&&["touchstart","click"].forEach(function(e){return n.addEventListener(e,t)})})}();
\ No newline at end of file
diff --git a/webyarns-util/lib/auto-video-play.min.js b/webyarns-util/lib/auto-video-play.min.js
index 6935018b474..48f071c8d95 100644
--- a/webyarns-util/lib/auto-video-play.min.js
+++ b/webyarns-util/lib/auto-video-play.min.js
@@ -1 +1,2 @@
+// version 3.8.0.4
 "use strict";function _typeof(e){return(_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}!function(e){"object"===("undefined"==typeof exports?"undefined":_typeof(exports))?module.exports=e():(Object.assign(window,e()),window.addEventListener("DOMContentLoaded",function(){Reveal.addEventListener("ready",window.autoplayVideo),Reveal.addEventListener("slidechanged",window.autoplayVideo)}))}(function(){return console.log("Deprecated script: auto-video-play.ts. Use reveal's built-in support https://revealjs.com/media/#autoplay  (data-autoplay)"),{autoplayVideo:function(e){e.currentSlide.querySelectorAll("video[data-autostart]").forEach(function(e){e instanceof HTMLVideoElement&&e.play()}),e.previousSlide&&e.previousSlide.querySelectorAll("video[data-autostart]").forEach(function(e){e instanceof HTMLVideoElement&&e.pause()})}}});
\ No newline at end of file
diff --git a/webyarns-util/lib/credits.min.js b/webyarns-util/lib/credits.min.js
index 930447643ee..2d86ae5c535 100644
--- a/webyarns-util/lib/credits.min.js
+++ b/webyarns-util/lib/credits.min.js
@@ -1 +1,2 @@
+// version 3.8.0.4
 "use strict";!function(){var r,t=!1,o=0;Reveal.addEventListener("slidechanged",function(e){if("credits"===e.currentSlide.id){var l=document.getElementById("scrollTitles");l.scrollTop=0,r=setInterval(function(e){return function(){t?(e.scrollTop=o=0,t=0!==e.scrollTop,e.scrollTop=o,o--):(e.scrollTop=o,o++,t=e.scrollTop>=e.scrollHeight-e.offsetHeight)}}(l),30)}"credits"===e.previousSlide&&clearInterval(r)})}();
\ No newline at end of file
diff --git a/webyarns-util/lib/helpers.min.js b/webyarns-util/lib/helpers.min.js
index 0582f1f9563..e6e61c4a72c 100644
--- a/webyarns-util/lib/helpers.min.js
+++ b/webyarns-util/lib/helpers.min.js
@@ -1 +1,2 @@
+// version 3.8.0.4
 "use strict";function _typeof(n){return(_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(n){return typeof n}:function(n){return n&&"function"==typeof Symbol&&n.constructor===Symbol&&n!==Symbol.prototype?"symbol":typeof n})(n)}!function(n){"object"===("undefined"==typeof exports?"undefined":_typeof(exports))?module.exports=n(!0):window.Webyarns=n()}(function(){function c(n){return Array.from(n.attributes).map(function(n){return n.name})}function n(i){return function n(t,e,o){var r=2<arguments.length&&void 0!==o?o:0,u=i(t);return u&&function(n){return function(t,e){return function(n){return e(t(n))}}(c,function(t){return function(n){return n.some(function(n){return t.includes(n)})}}(n))}(e)(u)?n(u,e,r+1):r}}var t=0<arguments.length&&void 0!==arguments[0]&&arguments[0],e="ontouchstart"in window||0<navigator.maxTouchPoints||0<navigator.msMaxTouchPoints,o=n(function(n){return n.nextElementSibling}),r=n(function(n){return n.previousElementSibling}),u=["data-hidden-section",e?"data-non-touch-only-section":"data-touch-only-section"],i={noOfHiddenLeft:function(n){return r(n,["data-right-only-section"].concat(u))},noOfHiddenRight:function(n){return o(n,["data-left-only-section"].concat(u))},getNextSlideIndexH:function(n){var t=n.getAttribute("data-next-slide-indexh");try{return t?parseInt(t,10):null}catch(n){throw Error("data-next-slide-indexh, must be a number, got ".concat(t))}},lookupIndex:function(n){var t=document.querySelector(".slides"),e=document.getElementById(n);return t&&e?Array.from(t.children).indexOf(e):-1}};return t&&(i.countNext=o,i.countPrev=r),i});
\ No newline at end of file
diff --git a/webyarns-util/lib/preloader.min.js b/webyarns-util/lib/preloader.min.js
index bb6440012c1..0ce2278e87f 100644
--- a/webyarns-util/lib/preloader.min.js
+++ b/webyarns-util/lib/preloader.min.js
@@ -1 +1,2 @@
+// version 3.8.0.4
 "use strict";window.addEventListener("load",function(){document.querySelectorAll(".preloader").forEach(function(e){var o;return null===(o=e.parentNode)||void 0===o?void 0:o.removeChild(e)}),document.querySelectorAll(".reveal").forEach(function(e){e.style.opacity="1"})});
\ No newline at end of file
diff --git a/webyarns-util/lib/webyarn-plugin.min.js b/webyarns-util/lib/webyarn-plugin.min.js
index 883775dcb51..7bf6a2086ae 100644
--- a/webyarns-util/lib/webyarn-plugin.min.js
+++ b/webyarns-util/lib/webyarn-plugin.min.js
@@ -1 +1,2 @@
+// version 3.8.0.4
 "use strict";!function(){var e={init:function(){var e=document.createElement("style");document.head.appendChild(e),Reveal.addEventListener("slidechanged",function(e){!function(e){var i=e.currentSlide.getAttribute("data-auto-move-to");if(i){var t=e.currentSlide.getAttribute("data-auto-move-time-sec"),n=t?1e3*Number.parseFloat(t):1,a=i.match(/random\(([0-9,\s]+)\)/),r=setTimeout(function(){if("next"===i)Reveal.next();else if("prev"===i)Reveal.prev();else if("#"===i.charAt(0))document.location.hash=i;else if(a){var e=a[1].split(",").map(function(e){return e.trim()}).map(function(e){return Number.parseInt(e,10)}),t=e[Math.floor(Math.random()*e.length)];Reveal.slide(t)}else if(function(e){return/^\d+$/.test(e)}(i)){var n=parseInt(i,10)-1;Reveal.slide(n)}else{var r=Webyarns.lookupIndex(i);-1===r&&console.error("get not find slide with id",i),Reveal.slide(r)}},n);Reveal.addEventListener("slidechanged",function(){return clearTimeout(r)})}}(e),function(e){var t=e.previousSlide;if(!t)return;t.getAttribute("data-one-time")&&t.setAttribute("data-hidden-section","true")}(e)}),function(e){e.insertRule("a[data-link-indexh] { cursor: pointer }",0),document.querySelectorAll("a[data-link-indexh]").forEach(function(r){return r.addEventListener("click",function(e){e.preventDefault();var t=r.getAttribute("data-link-indexh");if(t){var n=parseInt(t,10);Reveal.slide(n)}})})}(e.sheet),document.querySelectorAll("video[data-auto-next]").forEach(function(e){e.addEventListener("ended",function(e){return Reveal.next()})})}};Reveal.registerPlugin("WebyarnPlugin",e)}();
\ No newline at end of file
diff --git a/webyarns-util/lib/webyarns-sound.min.js b/webyarns-util/lib/webyarns-sound.min.js
index 3381eb010ed..d0a6ea667cd 100644
--- a/webyarns-util/lib/webyarns-sound.min.js
+++ b/webyarns-util/lib/webyarns-sound.min.js
@@ -1 +1,2 @@
+// version 3.8.0.4
 "use strict";function _defineProperty(t,r,e){return r in t?Object.defineProperty(t,r,{value:e,enumerable:!0,configurable:!0,writable:!0}):t[r]=e,t}function _toConsumableArray(t){return _arrayWithoutHoles(t)||_iterableToArray(t)||_nonIterableSpread()}function _nonIterableSpread(){throw new TypeError("Invalid attempt to spread non-iterable instance")}function _iterableToArray(t){if(Symbol.iterator in Object(t)||"[object Arguments]"===Object.prototype.toString.call(t))return Array.from(t)}function _arrayWithoutHoles(t){if(Array.isArray(t)){for(var r=0,e=new Array(t.length);r<t.length;r++)e[r]=t[r];return e}}function _slicedToArray(t,r){return _arrayWithHoles(t)||_iterableToArrayLimit(t,r)||_nonIterableRest()}function _nonIterableRest(){throw new TypeError("Invalid attempt to destructure non-iterable instance")}function _iterableToArrayLimit(t,r){if(Symbol.iterator in Object(t)||"[object Arguments]"===Object.prototype.toString.call(t)){var e=[],n=!0,o=!1,i=void 0;try{for(var a,u=t[Symbol.iterator]();!(n=(a=u.next()).done)&&(e.push(a.value),!r||e.length!==r);n=!0);}catch(t){o=!0,i=t}finally{try{n||null==u.return||u.return()}finally{if(o)throw i}}return e}}function _arrayWithHoles(t){if(Array.isArray(t))return t}function _typeof(t){return(_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t})(t)}!function(t){"object"===("undefined"==typeof exports?"undefined":_typeof(exports))?module.exports=t():document.addEventListener("DOMContentLoaded",t)}(function(){function s(t){return t.startsWith("!")||t.startsWith(">")||t.startsWith("#")?t.substring(1):t}function f(t){return t?t.split(",").map(function(t){return t.trim()}):[]}function d(t,r){var e=_slicedToArray(function(t,i){return t.reduce(function(t,r){var e=_slicedToArray(t,2),n=e[0],o=e[1];return i(r)?[[].concat(_toConsumableArray(n),[r]),o]:[n,[].concat(_toConsumableArray(o),[r])]},[[],[]])}(r,function(t){return t.startsWith("!")}),2),n=e[0],o=e[1],i=o.filter(function(t){return t.startsWith("#")}).map(s),a=o.filter(function(t){return t.startsWith(">")}).map(s);p=[].concat(_toConsumableArray(p),_toConsumableArray(a));var u=t.map(s),l=r.map(s),c=n.map(s);return[[].concat(_toConsumableArray(u.filter(function(t){return!o.includes(t)}).filter(function(t){return!c.includes(t)}).filter(function(t){return-1===p.indexOf(t)})),_toConsumableArray(i)),[].concat(_toConsumableArray(l.filter(function(t){return!u.includes(t)}).filter(function(t){return!i.includes(t)})),_toConsumableArray(c))]}var t,n=null==(t=document.getElementById("sounds"))?(console.error('Cannot find <script id="sounds" type="application/json">'),{}):JSON.parse(t.innerHTML),y=Object.keys(n).reduce(function(t,r){var e=new Howl({src:n[r].src,loop:Boolean(n[r].loop)});return e.on("fade",function(t){0===e.volume()&&e.stop(t)}),Object.assign(t,_defineProperty({},r,e))},{}),p=[];function r(e){function r(t){var r=e.currentSlide.getAttribute("data-sounds-"+t)||e.currentSlide.getAttribute(t);return r?parseInt(r,10):1500}var t,n=null===(t=e.previousSlide)||void 0===t?void 0:t.getAttribute("data-sounds"),o=e.currentSlide.getAttribute("data-sounds"),i=f(o),a=f(n),u=_slicedToArray(d(a,i),2),l=u[0],c=u[1];!function(t){var r=t.currentSlide.getAttribute("data-sounds-volume-change");if(r){console.log(r);var e=_slicedToArray(null==r?void 0:r.split(":"),2),n=e[0],o=e[1],i=parseFloat(o);y[n].volume(i),console.log("increased volume for ",n,"with",i)}}(e),l.map(function(t){y[t]?y[t].fade(1,0,r("fade-out-speed")):console.error("no invalid audioMap for "+t)}),c.map(function(t){y[t]?(y[t].stop(),y[t].play(),y[t].fade(0,1,r("fade-in-speed"))):console.error("no invalid audioMap for "+t)})}return Reveal.addEventListener("ready",r),Reveal.addEventListener("slidechanged",r),{soundHandler:r,_test:{nextAudioActions:d}}});
\ No newline at end of file