diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index f4efcf6..7fe8613 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -11,8 +11,8 @@ COPY package.json /app/rookeries/
 WORKDIR /app/rookeries
 RUN npm install --quiet
 
-RUN mkdir /app/rookeries/dist/ \
-    && mkdir /app/rookeries/static/js/
+RUN mkdir -p /app/rookeries/dist/ \
+    && mkdir -p /app/rookeries/static/js/
 COPY static/ /app/rookeries/static/
 COPY src/ /app/rookeries/src/
 COPY tests/ /app/rookeries/tests/
diff --git a/frontend/src/actions.js b/frontend/src/actions.js
index e0af3b2..3a1ba1c 100644
--- a/frontend/src/actions.js
+++ b/frontend/src/actions.js
@@ -240,9 +240,8 @@ export function loginUser(username, password) {
             if (authToken !== undefined) {
                 let user = Reflect.get(json, "user");
                 return dispatch(updateUser(authToken, user));
-            } else {
-                return dispatch(logoutUser(`${json.description} for "${username}".`));
             }
+            return dispatch(logoutUser(`${json.description} for "${username}".`));
         });
     }
 }
diff --git a/frontend/src/server/react_render.js b/frontend/src/server/react_render.js
index 9030c92..0863c98 100644
--- a/frontend/src/server/react_render.js
+++ b/frontend/src/server/react_render.js
@@ -6,8 +6,6 @@
  @author Dorian Pula [dorian.pula@amber-penguin-software.ca]
  */
 
-import React from "react";
-
 import {renderReactComponentsToString} from "../router/server";
 
 function renderReactPage(request, response) {
diff --git a/frontend/src/user_info.js b/frontend/src/user_info.js
index c171f88..0746772 100644
--- a/frontend/src/user_info.js
+++ b/frontend/src/user_info.js
@@ -8,10 +8,10 @@ User preferences via local storage
 
 
 if (typeof localStorage === "undefined" || localStorage === null) {
-    var LocalStorage = require("node-localstorage").LocalStorage;
+    const LocalStorage = require("node-localstorage").LocalStorage;
     // TODO: Change out mechanism to use other persistance setup.
-    var FileSystem = require("fs");
-    var UUID = require("node-uuid");
+    const FileSystem = require("fs");
+    const UUID = require("node-uuid");
     let tempDirPath = "/tmp/rookeries";
     try {
         FileSystem.statSync(tempDirPath).isDirectory();
diff --git a/frontend/src/views/code_editor.js b/frontend/src/views/code_editor.js
index e1102c4..e0e6872 100644
--- a/frontend/src/views/code_editor.js
+++ b/frontend/src/views/code_editor.js
@@ -24,6 +24,14 @@ if (typeof(navigator) !== 'undefined') {
 
 
 class CodeEditor extends React.Component {
+    static get propTypes() {
+        return {
+            code: React.PropTypes.string,
+            language: React.PropTypes.string,
+            theme: React.PropTypes.string,
+        }
+    }
+
     render() {
         let code = this.props.code;
         let options = {mode: this.props.language, theme: this.props.theme};