Change name of express_port to dev_app_port so people know not to use…

… it in production

.env

@@ -1,5 +1,5 @@
 NODE_ENV=development
-EXPRESS_PORT=8080
+DEV_APP_PORT=8080
 ROLLBAR_ACCESS_TOKEN=set_this_in_production
 OUTPUT_DIR=./build
 PUBLIC_DIR=./build/client

src/server/index.js

@@ -13,7 +13,8 @@ process.on('uncaughtException', (ex) => {
 })
 
 const app = express()
-const port = process.env.NODE_ENV === 'production' ? process.env.PORT : process.env.EXPRESS_PORT
+// Heroku requires you to use process.env.PORT
+const port = process.env.DEV_APP_PORT || process.env.PORT
 // Don't rate limit heroku
 app.enable('trust proxy')
 

webpack/server.js

@@ -4,7 +4,7 @@ import config from './config'
 import log from '../src/server/log'
 
 const webpackPort = 3000
-const appPort = process.env.EXPRESS_PORT
+const appPort = process.env.DEV_APP_PORT
 
 Object.keys(config.entry)
 .forEach((key) => {