add lz compression to localstorage state

src/store/index.js

@@ -1,6 +1,7 @@
 import Vue from 'vue';
 import Vuex from 'vuex';
 import createPersistedState from 'vuex-persistedstate';
+import lz from 'lz-string';
 
 import authentication from './authentication';
 
@@ -13,7 +14,16 @@ const store = new Vuex.Store({
     authentication,
   },
   plugins: [
-    createPersistedState(),
+    createPersistedState({
+      getState(key) {
+        const state = lz.decompress(window.localStorage.getItem(key));
+        return JSON.parse(state);
+      },
+      setState(key, state) {
+        const stateJSON = JSON.stringify(state);
+        return window.localStorage.setItem(key, lz.compress(stateJSON));
+      },
+    }),
   ],
 });