Revert "Require files directly instead of resolving them (#3683)" (#3684

)

This reverts commit fa03f0b.

server/render.js

@@ -4,6 +4,7 @@ import { renderToString, renderToStaticMarkup } from 'react-dom/server'
 import send from 'send'
 import generateETag from 'etag'
 import fresh from 'fresh'
+import requireModule from './require'
 import getConfig from './config'
 import { Router } from '../lib/router'
 import { loadGetInitialProps, isResSent } from '../lib/utils'
@@ -54,17 +55,10 @@ async function doRender (req, res, pathname, query, {
   const pagePath = join(dir, dist, 'dist', 'bundles', 'pages', page)
   const documentPath = join(dir, dist, 'dist', 'bundles', 'pages', '_document')
 
-  let Component
-  let Document
-  try {
-    Component = require(pagePath)
-    Document = require(documentPath)
-  } catch (err) {
-    const err = new Error(`Cannot find module`)
-    err.code = 'ENOENT'
-    throw err
-  }
-
+  let [Component, Document] = await Promise.all([
+    requireModule(pagePath),
+    requireModule(documentPath)
+  ])
   Component = Component.default || Component
   Document = Document.default || Document
   const asPath = req.url

server/require.js

@@ -0,0 +1,6 @@
+import resolve from './resolve'
+
+export default async function requireModule (path) {
+  const f = await resolve(path)
+  return require(f)
+}