How do you prefetch data in TanStack Query to speed up navigation?

Prefetching loads data into the cache before it is needed — on hover, on route entry, or alongside the current page. When the user navigates, data is already cached and renders instantly.

<script setup lang="ts">
import { useQueryClient } from "@tanstack/vue-query"
import { ref, watchEffect } from "vue"
const qc = useQueryClient()

// Prefetch on hover
async function prefetchPost(id:number){
  await qc.prefetchQuery({
    queryKey: ["post",id],
    queryFn:  ()=>fetchPost(id),
    staleTime: 1000*60, // skip if cached < 1 min
  })
}

// Prefetch next page while user reads current
const page=ref(1)
watchEffect(()=>{
  qc.prefetchQuery({
    queryKey: ["posts",page.value+1],
    queryFn:  ()=>fetchPosts(page.value+1),
  })
})
</script>
<template>
  <RouterLink v-for="p in data?.items" :key="p.id"
    :to="`/posts/${p.id}`"
    @mouseenter="prefetchPost(p.id)">{{ p.title }}</RouterLink>
</template>

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