exporting createApp function in app.js

lib/app.js

@@ -1,5 +1,10 @@
 const express = require('express')
+const middleware = require('../middleware/index.js')
 
-const app = express()
-require('../middleware')(app)
-module.exports = app
+function createApp () {
+  const app = express()
+  middleware(app)
+  return app
+}
+
+module.exports = createApp

lib/frontmatter.js

@@ -1,6 +1,9 @@
 const parse = require('./read-frontmatter')
-const semverValidRange = require('semver').validRange
-const layoutNames = Object.keys(require('./layouts')).concat([false])
+const semver = require('semver')
+const layouts = require('./layouts')
+
+const semverValidRange = semver.validRange
+const layoutNames = Object.keys(layouts).concat([false])
 const semverRange = {
   type: 'string',
   conform: semverValidRange,

server.js

@@ -49,7 +49,7 @@ async function checkPortAvailability () {
 }
 
 async function startServer () {
-  const app = libApp
+  const app = libApp()
   const warmServer = libWarmServer
 
   // If in a deployed environment...