Update SessionManager.ts

Stop crashing if someone wanted to import the library in an SSR enabled app. keratin#30
carcinocron · Sep 21, 2019 · cf71ee5 · cf71ee5
1 parent 4227a1b
commit cf71ee5
Showing 1 changed file with 7 additions and 5 deletions.
diff --git a/src/SessionManager.ts b/src/SessionManager.ts
@@ -10,11 +10,13 @@ export default class SessionManager {
   // immediately hook into visibility changes. strange things can happen to timeouts while a device
   // is asleep, so we want to reset them.
   constructor() {
-    document.addEventListener('visibilitychange', () => {
-      if (document.visibilityState === 'visible') {
-        this.scheduleRefresh();
-      };
-    });
+    if (typeof document !== 'undefined') {
+      document.addEventListener('visibilitychange', () => {
+        if (document.visibilityState === 'visible') {
+          this.scheduleRefresh();
+        };
+      });
+    }
   }
 
   setStore(store: SessionStore): void {