From 8591f48ed22e5e7275b8f27e843d7806eb721559 Mon Sep 17 00:00:00 2001
From: Michael Hsu <evenchange4@gmail.com>
Date: Fri, 31 May 2019 13:59:28 +0800
Subject: [PATCH] Add SSR support

resolved #6
---
 index.js | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/index.js b/index.js
index 32509f1..c89b6a0 100644
--- a/index.js
+++ b/index.js
@@ -13,10 +13,15 @@ try {
   window.removeEventListener('testPassive', null, opts)
 } catch (e) {}
 
-let getPosition = () => ({
-  x: window.pageXOffset,
-  y: window.pageYOffset,
-})
+let getPosition = () => {
+  if (typeof window === 'undefined') {
+    return { x: 0, y: 0 };
+  }
+  return {
+    x: window.pageXOffset,
+    y: window.pageYOffset,
+  };
+};
 
 let defaultOptions = {
   throttle: 100,