diff --git a/lib/main.js b/lib/main.js
index da45504..13272f7 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -1,25 +1,44 @@
+// @ts-check
+/// <reference path="../typings/atom-ide.d.ts"/>
 'use babel';
 
-import { CompositeDisposable } from 'atom';
-import renderer from './renderer';
-
-export default {
+const { CompositeDisposable } = require('atom');
+const renderer = require('./renderer');
 
+/**
+ * the Atom IDE markdown service plugin
+ * @type {Object}
+ */
+module.exports = {
   /**
    * [subscriptions description]
    * @type {CompositeDisposable}
    */
   subscriptions: null,
 
+  /**
+   * called by Atom when activating an extension
+   * @param  {any} state the current state of atom
+   */
   activate(state) {
     // Events subscribed to in atom's system can be easily cleaned up with a CompositeDisposable
     this.subscriptions = new CompositeDisposable();
   },
 
+  /**
+   * called by Atom when deactivating an extension
+   */
   deactivate() {
-    this.subscriptions.dispose();
+    if (this.subscriptions) {
+      this.subscriptions.dispose();
+    }
+    this.subscriptions = null;
   },
 
+  /**
+   * provide an interface to the Markdown renderer service
+   * @return {AtomIDE.MarkdownService} the markdown renderer service
+   */
   provideMarkdownRenderer() {
     return renderer;
   }
diff --git a/lib/renderer.js b/lib/renderer.js
index 76ed31c..00a9bc3 100644
--- a/lib/renderer.js
+++ b/lib/renderer.js
@@ -1,8 +1,9 @@
+// @ts-check
+/// <reference path="../typings/atom-ide.d.ts"/>
 'use babel';
 
-import { TextEditor } from 'atom';
-import { scopeForFenceName } from './utils';
-
+const { TextEditor } = require('atom');
+const { scopeForFenceName } = require('./utils');
 const marked = require('marked');
 const createDOMPurify = require('dompurify');
 
@@ -28,7 +29,7 @@ async function highlightCodeFragments(domFragment, grammar) {
   if (fontFamily !== null) {
     domFragment.querySelectorAll('code').forEach(codeElement => {
       codeElement.style.fontFamily = fontFamily;
-      codeElement.style.fontSize = fontSize;
+      codeElement.style.fontSize = `${fontSize}`;
     });
   }
 
@@ -84,7 +85,8 @@ function tokenizeEditor(editorElement, preElement) {
     if ((languageMode.fullyTokenized) || (languageMode.tree)) {
       editor.component.getNextUpdatePromise().then(() => {
         done();
-      });
+      })
+      .catch(reject);
     }
     else {
       editor.onDidTokenize(() => {
@@ -110,13 +112,16 @@ function internalRender(markdownText) {
   return template.content.cloneNode(true);
 }
 
-
-export default {
+/**
+ * the markdown service object
+ * @type {AtomIDE.MarkdownService}
+ */
+module.exports = {
   /**
    * renders the markdown text to html
-   * @param  {String} markdownText the markdown text to render
-   * @param  {String} grammar the default grammar used in code sections that have no specific grammar set
-   * @return {String} the inner HTML text of the rendered section
+   * @param  {string} markdownText the markdown text to render
+   * @param  {string} grammar the default grammar used in code sections that have no specific grammar set
+   * @return {Promise<string>} the inner HTML text of the rendered section
    */
   async render (markdownText, grammar) {
     let node = internalRender(markdownText);
diff --git a/lib/utils.js b/lib/utils.js
index c73e71b..bae5c41 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -42,7 +42,7 @@ const scopesByFenceName = {
   'yml': 'source.yaml'
 };
 
-export default {
+module.exports = {
   scopeForFenceName (fenceName) {
     fenceName = fenceName.toLowerCase();
     let result = `source.${fenceName}`;
diff --git a/package.json b/package.json
index 9f52d49..5940b90 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
   "providedServices": {
     "markdown-renderer": {
       "versions": {
-        "0.1.0": "provideMarkdownRenderer"
+        "1.0.0": "provideMarkdownRenderer"
       }
     }
   }
diff --git a/typings/atom-ide-community.d.ts b/typings/atom-ide-community.d.ts
new file mode 100644
index 0000000..7824c0b
--- /dev/null
+++ b/typings/atom-ide-community.d.ts
@@ -0,0 +1,5 @@
+declare module 'atom-ide' {
+  export interface MarkdownService {
+    render (markdownText: string, grammar: string) => Promise<string>;
+  }
+}
diff --git a/typings/atom-ide.d.ts b/typings/atom-ide.d.ts
new file mode 100644
index 0000000..1287073
--- /dev/null
+++ b/typings/atom-ide.d.ts
@@ -0,0 +1,7 @@
+// @ts-check
+/// <reference path="../node_modules/atom-languageclient/typings/atom-ide/index.d.ts" />
+/// <reference path="./atom-ide-community.d.ts" />
+
+import * as AtomIDE from 'atom-ide';
+export = AtomIDE;
+export as namespace AtomIDE;