Clear require.cache in case files change

Author: mjackson

server.js

@@ -5,8 +5,13 @@ const JSONStream = require('JSONStream')
 const ReactDOMServer = require('react-dom/server')
 const React = require('react')
 
-function getDefaultExports(file) {
-  const moduleExports = require(file)
+function getDefaultExports(moduleID) {
+  // Clear the require cache, in case the file was
+  // changed since the server was started.
+  const cacheKey = require.resolve(moduleID)
+  delete require.cache[cacheKey]
+
+  const moduleExports = require(moduleID)
 
   // Return exports.default if using ES2015 modules.
   if (moduleExports && moduleExports.default)