From 4cfc8bd4b3f129f5c5b5a331a10a347a6a245f39 Mon Sep 17 00:00:00 2001
From: David Luzar <luzar.david@gmail.com>
Date: Thu, 16 Jul 2020 21:20:55 +0200
Subject: [PATCH] fix accessing nonexisting config property during appState
 clearing (#1928)

---
 src/appState.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/appState.ts b/src/appState.ts
index e10d8813..76d21281 100644
--- a/src/appState.ts
+++ b/src/appState.ts
@@ -139,7 +139,13 @@ const _clearAppStateForStorage = <ExportType extends "export" | "browser">(
   }[keyof typeof APP_STATE_STORAGE_CONF];
   const stateForExport = {} as { [K in ExportableKeys]?: typeof appState[K] };
   for (const key of Object.keys(appState) as (keyof typeof appState)[]) {
-    if (APP_STATE_STORAGE_CONF[key][exportType]) {
+    const propConfig = APP_STATE_STORAGE_CONF[key];
+    if (!propConfig) {
+      console.error(
+        `_clearAppStateForStorage: appState key "${key}" config doesn't exist for "${exportType}" export type`,
+      );
+    }
+    if (propConfig?.[exportType]) {
       // @ts-ignore see https://github.com/microsoft/TypeScript/issues/31445
       stateForExport[key] = appState[key];
     }