feat: use vuex 4 for vue3

src/types/shims-vue.d.ts

@@ -2,3 +2,18 @@ declare module '*.vue' {
   import Vue from 'vue'
   export default Vue
 }
+
+// https://next.vuex.vuejs.org/guide/migrating-to-4-0-from-3-x.html#typescript-support
+import { ComponentCustomProperties } from 'vue'
+import { Store } from 'vuex'
+
+declare module '@vue/runtime-core' {
+  // Declare your own store states.
+  interface State {
+    count: number
+  }
+
+  interface ComponentCustomProperties {
+    $store: Store<State>
+  }
+}