Javascript + Vuex issue: how to access a Vuex boolean in a `v-if`

While working in a team project, my teammates wish me to display a div only when a certain boolean is true. However, I do not know how to access said boolean in the html.

---

App.vue:

<template>
  <div>
    <div v-if="store.state.initSession">If true</div>
  </div>
</template>

<script>
import { store } from '../store'
...
</script>

store.js:

import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

export const store =  new Vuex.Store({
  state: {
    initSession: false,
  },
...

Yet I get the following error:

[Vue warn]: Property or method "store" is not defined on the instance but referenced during render.

The error has been discussed in this post, but I continue not to know how to solve it.