diff --git a/docs/quickstart.md b/docs/quickstart.md
index 628fe81..edce1d8 100644
--- a/docs/quickstart.md
+++ b/docs/quickstart.md
@@ -8,9 +8,9 @@
 
 ## Install
 
-### Automatic 
+### Automatic
 
-``` bash
+```bash
 # install the cli app
 npm install -g create-proton-app
 # create your project
@@ -24,4 +24,4 @@ You can alternatively use `npx` if you prefer.
 
 ### Manual
 
-The old manual instructions are still available [here](manual_install.md)
\ No newline at end of file
+The old manual instructions are still available [here](manual_install.md)
diff --git a/src/components/DesktopComponent.js b/src/components/DesktopComponent.js
index 61221cd..9751adb 100644
--- a/src/components/DesktopComponent.js
+++ b/src/components/DesktopComponent.js
@@ -8,8 +8,17 @@ import {
   MenuBar,
 } from './';
 import { Menu } from '../';
+import {
+  ITEM,
+  CHECK,
+  QUIT,
+  PREFERENCES,
+  ABOUT,
+  SEPARATOR
+} from '../constants/types';
 import PropTypes from 'prop-types';
 
+
 const functionMappings = {
   onChange: 'onChanged',
   onClose: 'onClosing',
@@ -103,17 +112,17 @@ class DesktopComponent {
       // we assume we are a ComboBox.Item, and just append the child
       parent.element.append(this.props.children);
     } else if (parent instanceof MenuBar) {
-      if (this.props.type === 'Item') {
+      if (this.props.type === ITEM) {
         this.element = parent.element.appendItem(this.props.children);
-      } else if (this.props.type === 'Check') {
+      } else if (this.props.type === CHECK) {
         this.element = parent.element.appendCheckItem(this.props.children);
-      } else if (this.props.type === 'Quit') {
+      } else if (this.props.type === QUIT) {
         this.element = parent.element.appendQuitItem();
-      } else if (this.props.type === 'Preferences') {
+      } else if (this.props.type === PREFERENCES) {
         this.element = parent.element.appendPreferencesItem();
-      } else if (this.props.type === 'About') {
+      } else if (this.props.type === ABOUT) {
         this.element = parent.element.appendAboutItem();
-      } else if (this.props.type === 'Separator') {
+      } else if (this.props.type === SEPARATOR) {
         parent.element.appendSeparator();
       }
     } else if (this instanceof Menu) {
diff --git a/src/components/MenuBar.js b/src/components/MenuBar.js
index e0a1498..721ce93 100644
--- a/src/components/MenuBar.js
+++ b/src/components/MenuBar.js
@@ -2,6 +2,14 @@ import DesktopComponent, {
   universalPropTypes,
   universalDefaultProps,
 } from './DesktopComponent';
+import {
+  ITEM,
+  CHECK,
+  QUIT,
+  PREFERENCES,
+  ABOUT,
+  SEPARATOR
+} from '../constants/types';
 import libui from 'libui-node';
 import PropTypes from 'prop-types';
 
@@ -57,12 +65,12 @@ MenuBar.Item.PropTypes = {
   children: PropTypes.string,
   checked: PropTypes.bool,
   type: PropTypes.oneOf([
-    'Check',
-    'Quit',
-    'About',
-    'Preferences',
-    'Separator',
-    'Item',
+    CHECK,
+    QUIT,
+    ABOUT,
+    PREFERENCES,
+    SEPARATOR,
+    ITEM,
   ]),
   onClick: PropTypes.func,
   ...universalPropTypes,
@@ -71,7 +79,7 @@ MenuBar.Item.PropTypes = {
 MenuBar.Item.defaultProps = {
   children: '',
   checked: false,
-  type: 'Item',
+  type: ITEM,
   onClick: () => {},
   ...universalDefaultProps,
 };
diff --git a/src/constants/types.js b/src/constants/types.js
new file mode 100644
index 0000000..0e13960
--- /dev/null
+++ b/src/constants/types.js
@@ -0,0 +1,6 @@
+export const ITEM = 'Item';
+export const CHECK = 'Check';
+export const QUIT = 'Quit';
+export const PREFERENCES = 'Preferences';
+export const ABOUT = 'About';
+export const SEPARATOR = 'Separator';