From 4be6a521eddd23b5ba4bfc3997e20cb8d4b81d30 Mon Sep 17 00:00:00 2001
From: Tim Neutkens <tim@timneutkens.nl>
Date: Tue, 5 Dec 2017 15:35:30 -0800
Subject: [PATCH] Make sure we show a nice message when there is no default
 export (#3400)

---
 lib/router/router.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/router/router.js b/lib/router/router.js
index 1873002d..222499ab 100644
--- a/lib/router/router.js
+++ b/lib/router/router.js
@@ -199,6 +199,11 @@ export default class Router {
       }
 
       const { Component } = routeInfo
+
+      if (typeof Component !== 'function') {
+        throw new Error(`The default export is not a React Component in page: "${pathname}"`)
+      }
+
       const ctx = { pathname, query, asPath: as }
       routeInfo.props = await this.getInitialProps(Component, ctx)