fix(react-table): type aggregatedCell against bound cellComponents in createAppColumnHelper - #6584

Problem

createAppColumnHelper (from createTableHook) returns column-definition types whose render props are enhanced with the registered cellComponents / headerComponents, so you can write cell: ({ cell }) => <cell.MyCell />. This worked for cell, header, and footer, but not for aggregatedCell: inside it the cell render prop was the plain core Cell, with no bound components, so ({ cell }) => <cell.MyCell /> was a type error.

Fixes #6583

Cause

AppColumnDefBase (and its siblings AppDisplayColumnDef / AppGroupColumnDef) Omit the core cell | header | footer keys and re-declare them against the enhanced AppCellContext / AppHeaderContext. aggregatedCell — contributed by rowAggregationFeature and typed against the cell context, exactly like cell — was never part of that omit-and-enhance set, so it retained its core type.

Fix

Add 'aggregatedCell' to the omitted keys and re-declare it mirroring cell (both share the cell context) in AppColumnDefBase, AppDisplayColumnDef, and AppGroupColumnDef. This is a type-only, localized change; the runtime column helper is untouched (components are still bound at render time). JSDoc that enumerates the bound contexts was updated to mention aggregatedCell.

Testing

• Added packages/react-table/tests/createAppColumnHelper.test-d.tsx, a type-level test (checked by tsc via test:types, excluded from the vitest run by its .test-d. name) asserting aggregatedCell accepts a bound component name across accessor / display / group, with a @ts-expect-error guard that an unregistered component is still rejected. Confirmed it fails before the fix and passes after.
• pnpm --filter @tanstack/react-table test:types → passes.
• pnpm --filter @tanstack/react-table test:lib → 6 files, 34 tests passing.
• ESLint on the changed files → clean.

Summary by CodeRabbit

• New Features

  • Added support for custom rendering of aggregated cell values across accessor, display, and group columns.
  • Registered cell components are now available when rendering aggregated cells, with type checking to prevent unsupported components.

• Tests

  • Added type-level coverage validating aggregated-cell rendering and component registration across column helpers.