change 'prod' to 'production',

app.js

@@ -28,7 +28,7 @@ const auth = require('./routes/auth');
 app.use('/api/lists', auth.required, require('./routes/lists'));
 app.use('/api/todos', auth.required, require('./routes/todos'));
 
-if (process.env.NODE_ENV === 'prod') {
+if (process.env.NODE_ENV === 'production') {
   app.use(express.static(path.join(__dirname, 'react/build')));
   app.use('*', express.static(path.join(__dirname, 'react/build/index.html')));
 }

config/index.js

@@ -1,6 +1,6 @@
 const env = process.env.NODE_ENV;
 
-const prod = {
+const production = {
   app: {
     port: process.env.PORT,
   },
@@ -10,7 +10,7 @@ const prod = {
   secret: process.env.SECRET,
 };
 
-const dev = {
+const development = {
   app: {
     port: process.env.DEV_PORT || 4000,
   },
@@ -25,9 +25,9 @@ const test = {
 };
 
 const config = {
-  prod,
-  dev,
+  production,
+  development,
   test,
 };
 
-module.exports = config[env] || config.prod;
+module.exports = config[env] || config.production;

package.json

@@ -6,7 +6,7 @@
   "main": "app.js",
   "scripts": {
     "start": "node ./app.js",
-    "debug": "cross-env NODE_ENV=dev npx nodemon --inspect ./app.js",
+    "debug": "cross-env NODE_ENV=development npx nodemon --inspect ./app.js",
     "test": "cross-env NODE_ENV=test jest",
     "postinstall": "cd react && npm install && npm run build"
   },