From b1b714a598909a4122c82b76ab7b75ebfae57cb6 Mon Sep 17 00:00:00 2001
From: "Daniel J. Holmes (jaitaiwan)" <dan@centricwebestate.com>
Date: Tue, 7 Dec 2021 23:14:42 +1000
Subject: [PATCH] Updated to add Vuex 4.0 support

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

diff --git a/src/index.ts b/src/index.ts
index 9cc9871..91fbee9 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -108,7 +108,13 @@ export class VuexPersistence<S> implements PersistOptions<S> {
     this.RESTORE_MUTATION = function RESTORE_MUTATION(state: S, savedState: any) {
       const mergedState = merge(state, savedState || {}, _this.mergeOption)
       for (const propertyName of Object.keys(mergedState as {})) {
-        (this as any)._vm.$set(state, propertyName, (mergedState as any)[propertyName])
+        // Maintain support for vue 2
+        if ((this as any)._vm !== undefined && (this as any)._vm.$set !== undefined) {
+          (this as any)._vm.$set(state, propertyName, (mergedState as any)[propertyName])
+          continue
+        }
+
+        (state as any)[propertyName] = (mergedState as any)[propertyName]
       }
     }