Update index.js

Author: evenchange4

index.js

@@ -4,16 +4,15 @@ let _throttle = require('lodash.throttle')
 
 let supportsPassive = false
 try {
-  if (typeof window === 'undefined') {
-    return;
+  if (typeof window !== 'undefined') {
+    var opts = Object.defineProperty({}, 'passive', {
+      get: function() {
+        supportsPassive = true
+      },
+    })
+    window.addEventListener('testPassive', null, opts)
+    window.removeEventListener('testPassive', null, opts)
   }
-  var opts = Object.defineProperty({}, 'passive', {
-    get: function() {
-      supportsPassive = true
-    },
-  })
-  window.addEventListener('testPassive', null, opts)
-  window.removeEventListener('testPassive', null, opts)
 } catch (e) {}
 
 let getPosition = () => {