react-query/examples/vue/persister/src/Posts.vue

<script lang="ts">
import { defineComponent } from 'vue'
import { useQuery } from '@tanstack/vue-query'
import { experimental_createQueryPersister } from '@tanstack/query-persist-client-core'

import { Post } from './types'

const fetcher = async (): Promise<Post[]> =>
  await fetch('https://jsonplaceholder.typicode.com/posts').then(
    (response) =>
      new Promise((resolve) =>
        setTimeout(() => resolve(response.json()), 1000),
      ),
  )

export default defineComponent({
  name: 'PostsList',
  props: {
    isVisited: {
      type: Function,
      required: true,
    },
  },
  emits: ['setPostId'],
  setup() {
    const {
      isPending,
      isError,
      isFetching,
      isRefetching,
      data,
      error,
      refetch,
    } = useQuery({
      queryKey: ['posts'] as const,
      queryFn: () => fetcher(),
      persister: experimental_createQueryPersister({
        storage: localStorage,
      }).persisterFn,
      staleTime: 5000,
    })

    return {
      isPending,
      isRefetching,
      isError,
      isFetching,
      data,
      error,
      refetch,
    }
  },
})
</script>

<template>
  <h1>Posts</h1>
  <div v-if="isRefetching">Refetching...</div>
  <div v-if="isPending">Loading...</div>
  <div v-else-if="isError">An error has occurred: {{ error }}</div>
  <div v-else-if="data">
    <ul>
      <li v-for="item in data" :key="item.id">
        <a
          @click="$emit('setPostId', item.id)"
          href="#"
          :class="{ visited: isVisited(item.id) }"
          >{{ item.title }}</a
        >
      </li>
    </ul>
  </div>
</template>

<style scoped>
.visited {
  font-weight: bold;
  color: green;
}
</style>