diff --git a/src/elements/markdown-book2.js b/src/elements/markdown-book2.js
index 7b61614..d4c5de7 100644
--- a/src/elements/markdown-book2.js
+++ b/src/elements/markdown-book2.js
@@ -1,5 +1,5 @@
 import {MarkdownBook} from './markdown-book';
-import {bindable,observable} from 'aurelia-framework';
+import {bindable, observable} from 'aurelia-framework';
 
 export class MarkdownBook2 extends MarkdownBook {
     @bindable summary;
@@ -20,21 +20,19 @@ export class MarkdownBook2 extends MarkdownBook {
     }
 
     attached() {
-        console.log('markdown book2 attached() toc', this.toc);
+      console.log('markdown book2 attached() toc', this.toc);
       //super.attached();
       //console.log('markdownbook attached shownav', this.shownav);
     }
 
-    tocChanged(newValue,oldValue) {
-        this.mytoc.innerHTML = newValue;
+    tocChanged(newValue, oldValue) {
+      this.mytoc.innerHTML = newValue;
     }
 
-    scrollto(id){
-        let el = document.getElementById(id);
-        console.log('markdownbook2 scrollto() id,el',id,el);
-        el.scrollIntoView();
-//        document.getElementById(id).scrollIntoView();
+    scrollto(id) {
+      let el = document.getElementById(id);
+      console.log('markdownbook2 scrollto() id,el', id, el);
+      el.scrollIntoView();
+      //        document.getElementById(id).scrollIntoView();
     }
-
-
 }
diff --git a/src/elements/markdown-it-btoc.js b/src/elements/markdown-it-btoc.js
index 4fb46e4..2808089 100644
--- a/src/elements/markdown-it-btoc.js
+++ b/src/elements/markdown-it-btoc.js
@@ -10,15 +10,13 @@ let defaultOptions = {
   reverseLink: false
 };
 
-export function markdownitbtoc(md, options) {
+export function markdownitbtoc(md, _options) {
   // Set default options
-  var options = Object.assign({}, defaultOptions, options);
+  let options = Object.assign({}, defaultOptions, _options);
 
   // Global variables
-  if (!headingInfos) {
-    var headingInfos = [];
-  } else {
-
+  if (!window.headingInfos) {
+    window.headingInfos = [];
   }
 
   md.inline.ruler.after('emphasis', 'toc', function(state, silent) {
@@ -53,7 +51,7 @@ export function markdownitbtoc(md, options) {
     // Parses all heading information to render the TOC
     for (let i = 0; i < tokens.length; i++) {
       if (tokens[i].type === 'heading_open') {
-        let tagLevel = parseInt(tokens[i].tag[1]);
+        let tagLevel = parseInt(tokens[i].tag[1], 10);
         let numbering = [];
 
         headingCounts[tagLevel] += 1;
diff --git a/src/elements/markdownaurelia.js b/src/elements/markdownaurelia.js
index bcf1c03..6d3e98d 100644
--- a/src/elements/markdownaurelia.js
+++ b/src/elements/markdownaurelia.js
@@ -114,7 +114,7 @@ export class Markdownaurelia {
         //convert from md to html
         this.html = this.md.render(this.text);
         let tocregex = /<div[^<>]*id="toc"[^<>]*>(.*?)<\/div>/g;
-        this.toc = this.md.render('@[toc] \n'+this.text).match(tocregex)[0];
+        this.toc = this.md.render('@[toc] \n' + this.text).match(tocregex)[0];
         console.log('readmd toc:', this.toc);
         this.update();
       });