From 686037f1cffb33dbe87f5fc32831cd8553edb0ee Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Fri, 8 Sep 2017 13:27:05 +0200
Subject: [PATCH] Fallback to regular require if `module.parent.require` is
 unavailable

Some environments (like jest) don't implement it
---
 express.js     | 5 +++--
 src/express.js | 7 ++++++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/express.js b/express.js
index 1c85a57d95..9820929ab4 100644
--- a/express.js
+++ b/express.js
@@ -1,8 +1,9 @@
 var isDebug = require('./env').isDebug;
 var parentModule = module.parent;
+var parentRequire = parentModule && parentModule.require || require;
 
 if (isDebug) {
-    module.exports = parentModule.require('marko/src/express');
+    module.exports = parentRequire('marko/src/express');
 } else {
-    module.exports = parentModule.require('marko/dist/express');
+    module.exports = parentRequire('marko/dist/express');
 }
diff --git a/src/express.js b/src/express.js
index 1e535bc837..585fc9f8fe 100644
--- a/src/express.js
+++ b/src/express.js
@@ -1,7 +1,12 @@
 require('./');
 
 var assign = require('object-assign');
-var express = module.parent.require('express');
+
+var parentModule = module.parent;
+var parentRequire = parentModule && parentModule.require || require;
+
+var express = parentRequire('express');
+
 patchResponse(express.response);
 delete require.cache[__filename];