@molecule/app-virtual-scroll-tanstack

Auto-generated, AI-first package reference for the molecule.dev ecosystem. It is written to be read by coding agents as much as by people, and is generated from this package's source — edit src/index.ts JSDoc, not this file.

TanStack Virtual provider for the molecule virtual scroll interface.

Implements VirtualScrollProvider from @molecule/app-virtual-scroll using @tanstack/virtual-core for headless virtual/infinite scrolling.

Quick Start

import { provider } from '@molecule/app-virtual-scroll-tanstack'
import { setProvider } from '@molecule/app-virtual-scroll'

setProvider(provider)

Type

provider

Installation

npm install @molecule/app-virtual-scroll-tanstack @molecule/app-virtual-scroll @tanstack/virtual-core

API

Interfaces

TanStackVirtualConfig

Configuration options for the TanStack Virtual scroll provider.

interface TanStackVirtualConfig {
  /**
   * Whether to enable debug mode in TanStack Virtual.
   * When `true`, TanStack logs internal state changes to the console.
   * Defaults to `false`.
   */
  debug?: boolean

  /**
   * Delay in milliseconds before the `isScrolling` state resets to `false`
   * after scrolling stops. Defaults to `150`.
   */
  isScrollingResetDelay?: number

  /**
   * Whether to use the native `scrollend` event instead of debouncing.
   * Defaults to `false`.
   */
  useScrollendEvent?: boolean
}

Functions

createTanStackProvider(config)

Creates a TanStack Virtual-backed virtual scroll provider.

function createTanStackProvider(config?: TanStackVirtualConfig): VirtualScrollProvider

• config — Optional TanStack-specific configuration.

Returns: A VirtualScrollProvider backed by TanStack Virtual.

Constants

provider

Default TanStack Virtual provider instance.

const provider: VirtualScrollProvider

Core Interface

Implements @molecule/app-virtual-scroll interface.

Bond Wiring

Setup function to register this provider with the core interface:

import { setProvider } from '@molecule/app-virtual-scroll'
import { provider } from '@molecule/app-virtual-scroll-tanstack'

export function setupVirtualScrollTanstack(): void {
  setProvider(provider)
}

Injection Notes

Requirements

Peer dependencies:

• @molecule/app-virtual-scroll >=1.0.1

Runtime Dependencies

• @molecule/app-virtual-scroll
• @tanstack/virtual-core

Provide onChange in the INITIAL options — setOptions() cannot attach one after creation (the callback is wired only at createVirtualizer time).

E2E Tests

Integration checklist — drive the real UI (live preview, no mocks), adapt each item to this app's actual screens/flows, and check every box off one by one. A box you can't check is an integration bug to fix — not a skip:

• [ ] A large list (hundreds+ of items) renders immediately, and only a window of rows exists in the DOM (row-element count stays far below the total).
• [ ] Scrolling far down (middle and end of the list) shows the CORRECT items for that position — no blank gaps, no duplicated or overlapping rows.
• [ ] The scrollbar reflects the full list size (jumping to the end reaches the last item, not a truncated tail).
• [ ] With variable-height content, fast scrolling then stopping settles with no overlap and no jitter.
• [ ] If wired to infinite loading, reaching the bottom loads and appends the next batch seamlessly (no scroll-position jump back to top).