feat(lit-virtual): re-export the virtual-core public API

.changeset/rich-poems-tickle.md

@@ -0,0 +1,5 @@
+---
+'@tanstack/lit-virtual': minor
+---
+
+Re-export `@tanstack/virtual-core` from `@tanstack/lit-virtual`, so the core API (`Virtualizer`, `defaultRangeExtractor`, `measureElement`, the scroll observers and the shared types) can be imported from the adapter without adding `@tanstack/virtual-core` as a second dependency. Every other framework adapter already does this.

packages/lit-virtual/src/index.ts

@@ -10,6 +10,8 @@ import {
 import type { ReactiveController, ReactiveControllerHost } from 'lit'
 import type { PartialKeys, VirtualizerOptions } from '@tanstack/virtual-core'
 
+export * from '@tanstack/virtual-core'
+
 class VirtualizerControllerBase<
   TScrollElement extends Element | Window,
   TItemElement extends Element,

packages/lit-virtual/tests/re-exports.test.ts

@@ -0,0 +1,39 @@
+import { expect, test } from 'vitest'
+import {
+  Virtualizer,
+  defaultKeyExtractor,
+  defaultRangeExtractor,
+  elementScroll,
+  measureElement,
+  observeElementOffset,
+  observeElementRect,
+  observeWindowOffset,
+  observeWindowRect,
+  windowScroll,
+} from '../src'
+
+// `@tanstack/lit-virtual` re-exports `@tanstack/virtual-core` so consumers can
+// reach the core API without adding a second dependency, matching every other
+// framework adapter in this repo.
+
+test('re-exports the Virtualizer class from virtual-core', () => {
+  expect(typeof Virtualizer).toBe('function')
+})
+
+test('re-exports the element observers and scroller from virtual-core', () => {
+  expect(typeof observeElementRect).toBe('function')
+  expect(typeof observeElementOffset).toBe('function')
+  expect(typeof elementScroll).toBe('function')
+})
+
+test('re-exports the window observers and scroller from virtual-core', () => {
+  expect(typeof observeWindowRect).toBe('function')
+  expect(typeof observeWindowOffset).toBe('function')
+  expect(typeof windowScroll).toBe('function')
+})
+
+test('re-exports the default extractors and measureElement from virtual-core', () => {
+  expect(typeof defaultRangeExtractor).toBe('function')
+  expect(typeof defaultKeyExtractor).toBe('function')
+  expect(typeof measureElement).toBe('function')
+})