How do you combine useInfiniteQuery with useVirtualizer for an infinitely scrolling virtualised list?

This is one of the most powerful TanStack patterns: useInfiniteQuery fetches pages as the user scrolls while useVirtualizer renders only visible DOM nodes — together they handle millions of rows with minimal memory.

<script setup lang="ts">
import { ref, computed, watchEffect } from "vue"
import { useInfiniteQuery }           from "@tanstack/vue-query"
import { useVirtualizer }             from "@tanstack/vue-virtual"

const parentRef=ref<HTMLDivElement|null>(null)

const { data, fetchNextPage, hasNextPage, isFetchingNextPage }=useInfiniteQuery({
  queryKey:         ["posts","infinite"],
  queryFn:          ({pageParam})=>fetchPosts({page:pageParam}),
  initialPageParam: 0,
  getNextPageParam: last=>last.nextPage??undefined,
})

const allRows=computed(()=>data.value?data.value.pages.flatMap(p=>p.rows):[])

const virt=useVirtualizer({
  // +1 sentinel row triggers next-page fetch when it enters viewport
  get count(){ return hasNextPage.value?allRows.value.length+1:allRows.value.length },
  getScrollElement: ()=>parentRef.value,
  estimateSize:     ()=>72,
  overscan:         5,
})
const vItems=computed(()=>virt.value.getVirtualItems())

watchEffect(()=>{
  const last=vItems.value.at(-1)
  if(!last) return
  if(last.index>=allRows.value.length-1 && hasNextPage.value && !isFetchingNextPage.value)
    fetchNextPage()
})
</script>

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