---
name: "react-virtual-window-scroll"
description: "Virtualize infinitely scrolling dynamic-height feeds and grids using @tanstack/react-virtual."
metadata:
  author: "TanStack"
  version: "1.0.0"
  runtime_compatibility:
    - "codex"
    - "claude-code"
    - "cursor"
    - "windsurf"
triggers:
  - "virtualize infinite list react"
  - "dynamic height virtual list"
  - "usewindowvirtualizer tanstack"
permissions:
  fs_read: true
  fs_write: "workspace"
  shell_exec: false
  net_access: false
---

# TanStack Virtual High-Throughput Window & List Virtualization

Implements TanStack Virtual: window scrolling (useWindowVirtualizer), fixed and dynamic item heights (measureElement), overscan buffering, infinite loading triggers, and scrolling to specific indices.

## When to Invoke
Invoke this skill whenever you need to:
- virtualize infinite list react
- dynamic height virtual list
- usewindowvirtualizer tanstack

## Execution SOP & Rules
1. Initialize virtualizer: const virtualizer = useWindowVirtualizer({ count, estimateSize: () => 100, overscan: 5 }).
2. Attach ref={virtualizer.measureElement} to dynamic height list item DOM nodes.
3. Render absolute positioning items: { top: 0, left: 0, width: '100%', transform: `translateY(${item.start}px)` }.
4. Trigger infinite pagination fetch when reaching the last virtual item index.

## Verification Checklist
- Run local linting, syntax validation, and type-checks before reporting completion.
- Ensure all created or modified files adhere to workspace boundaries and avoid uncommitted secrets.
- Verify tests or build commands exit cleanly with return code 0.