[~] Refactor

d2/book1/book.js

@@ -1,4 +1,6 @@
-(function() {
+(async function() {
+  await context.loading.script.promise;
+
   window.context.books.push(`
     DEATH of a HERO
 

d2/book1/index.html

@@ -15,6 +15,7 @@
 
     <script>
       window.context = {};
+      window.context.loading = {};
       window.context.books = [];
     </script>
     <script src="NoSleep.min.js"></script>

d2/book1/script.js

@@ -1,3 +1,18 @@
+class Future {
+  constructor() {
+    let self = this;
+
+    self.promise = new Promise(
+      (resolve, reject) => {
+        self.resolve = resolve;
+        self.reject = reject;
+      }
+    );
+  }
+}
+
+context.loading.script = new Future();
+
 $(window).on('load', () => {
 
   var synth = window.speechSynthesis;
@@ -505,4 +520,6 @@ $(window).on('load', () => {
   voiceSelect.onchange = function(){
     speak();
   }
+
+  context.loading.script.resolve(true);
 });