Apply this complete shared inventory before loading the installed adapter's migrate-v8-to-v9 skill. The adapter skill owns hook/controller construction, reactive inputs, rendering helpers, and framework subscription APIs.

Migration strategy

1. Make the v8 table pass its existing tests before changing it.
2. Migrate construction and features while preserving behavior.
3. Let TypeScript expose missing features and stale names.
4. Migrate state ownership and rendering through the adapter skill.
5. Test every enabled client/server row-model stage and interaction.
6. Replace temporary stockFeatures usage with explicit features when practical.

Treat useLegacyTable as a deprecated, React-only emergency bridge. It bundles every feature, can exceed the v8 bundle, and must not become the target architecture. Import it only from @tanstack/react-table/legacy when an existing incremental migration requires it.

Minimal v9 shape

import {
  createFilteredRowModel,
  createSortedRowModel,
  columnFilteringFeature,
  filterFn_includesString,
  rowSortingFeature,
  sortFn_alphanumeric,
  tableFeatures,
} from '@tanstack/table-core'

export const features = tableFeatures({
  columnFilteringFeature,
  rowSortingFeature,
  filteredRowModel: createFilteredRowModel(),
  sortedRowModel: createSortedRowModel(),
  filterFns: { includesString: filterFn_includesString },
  sortFns: { alphanumeric: sortFn_alphanumeric },
})

Pass features to the adapter's v9 table constructor. Define it statically outside render/setup work when possible.

Complete shared breaking-change inventory

1. Register every non-core feature explicitly

V8 bundled all stock features. V9 exposes an API only when its feature is present in tableFeatures({...}).

The core row model and core table/row/column/header/cell behavior are automatic. stockFeatures restores a v8-like all-features surface, but use it as an audit shortcut rather than the default production recommendation.

Honor feature prerequisites in the same tableFeatures call:

• columnResizingFeature requires columnSizingFeature.
• globalFilteringFeature requires columnFilteringFeature.
• Every row-model or function-registry slot requires its associated feature.
• aggregationFns requires rowAggregationFeature; grouped aggregation uses both rowAggregationFeature and columnGroupingFeature.
• Put prerequisite feature properties before dependent slots so inference and diagnostics remain clear.

2. Move row models into feature slots and rename factories

V8 get*RowModel() table options and the earlier-v9-beta rowModels object are gone. V9 create*RowModel() factories take no registry arguments and are registered as named feature slots.

For a custom core model, use the coreRowModel slot rather than restoring the v8 table option.

Move registries from table options or factory arguments into these feature slots:

Register only the built-ins the table references by string name, importing each individually (filterFn_includesString, sortFn_alphanumeric, aggregationFn_sum, and so on) alongside any custom functions. The full registry objects (filterFns, sortFns, aggregationFns exports) still work but bundle every built-in. A slot's keys become the valid string names in column definitions, and 'auto' resolves only registered functions.

Aggregation is independent from grouping. Add rowAggregationFeature for aggregationFn, aggregatedCell, column.getAggregationValue(options?), and cell.getIsAggregated. A root total does not require grouping. Convert legacy custom callables (columnId, leafRows, childRows) => result to constructAggregationFn({ aggregate: (context) => result, merge? }) definitions. Replace column.getAggregationFn() with column.getAggregationFns(); arrays in aggregationFn return keyed objects. Replace the old AggregationFn and CreatedAggregationFn types with AggregationFnDef. Aggregation row selection is shared across every definition on a column: maxAggregationDepth defaults to 0, while 1 selects direct sub-rows and Infinity selects terminal rows. Explicit totals can override it with the single object signature column.getAggregationValue({ rows, maxDepth }); positional row and depth arguments are not supported. All built-ins consume the same selected rows. Custom definitions can inspect grouped subRows, and merge receives matching subRowResults. Use table.getMaxSubRowDepth() when a depth should derive from the deepest structural row in the core model.

3. Migrate state reads and whole-state observation

table.getState() and the top-level onStateChange option are removed. Individual on[Slice]Change callbacks remain.

Load the adapter table-state skill before choosing reactive reads; adapters intentionally differ. When both an external atom and state provide a slice, the atom wins. Table writes go directly to that atom, and table.reset() does not reset externally owned atoms.

4. Keep instance methods bound

Row, cell, column, header, and related object methods moved to shared prototypes. Destructuring, passing a bare callback, spreading, Object.keys, and JSON.stringify no longer preserve or reveal those methods.

// v8 code that breaks
const { getValue } = row
rows.map(row.getVisibleCells)

// v9
const value = row.getValue('name')
rows.map((row) => row.getVisibleCells())

Audit all methods extracted from rows, cells, columns, headers, and header groups. Table-instance methods are not subject to this specific migration rule.

5. Replace physical column pinning with logical pinning

V9 beta.38 has no left/right aliases. Replace all state keys, return-value comparisons, arguments, and API families:

This names logical regions; it does not automatically apply DOM direction or sticky CSS. Use logical CSS such as inset-inline-start/insetInlineStart and inset-inline-end/insetInlineEnd. columnResizeDirection remains 'ltr' | 'rtl'.

6. Split column sizing from resizing

V8's combined sizing feature became two tree-shakeable features:

• Register columnSizingFeature for sizes, offsets, and total-size APIs.
• Also register columnResizingFeature for drag handles and transient interaction state.
• columnResizingFeature cannot stand alone.

The current source spelling is setColumnResizing with an uppercase C.

7. Rename sorting APIs

Also move the registry to tableFeatures, as described above.

8. Split the table-level pinning switch

Replace the v8 table option enablePinning with enableColumnPinning and/or enableRowPinning. Do not mechanically rename a column definition's enablePinning: that column-level option still exists.

9. Remove internal APIs and use public surfaces

All underscore-prefixed internals are unsupported and removed. Known migration points include:

For any other _ API, do not guess. Inspect the installed v9 package source for the public replacement or redesign the integration.

10. Update row-selection predicates

getIsSomeRowsSelected() and getIsSomePageRowsSelected() now mean at least one, including the all-selected case. They no longer mean “some but not all.” Build an indeterminate checkbox with both predicates:

const indeterminate =
  table.getIsSomeRowsSelected() && !table.getIsAllRowsSelected()

For a page checkbox, use table.getIsSomePageRowsSelected() && !table.getIsAllPageRowsSelected().

11. Update TypeScript feature generics and helpers

Most core types add TFeatures before their data/value parameters:

Prefer inference. Use typeof features only where an explicit type boundary is necessary; use StockFeatures when that is genuinely the selected feature set. Wrap column arrays with columnHelper.columns([...]) to preserve individual and nested TValue inference.

RowData is now Record<string, any> | Array<any>, not unknown. Wrap primitive records in an object or array shape.

Global TableMeta/ColumnMeta declaration merging can remain, but add TFeatures as the first generic. Prefer per-table type-only slots where isolation helps:

const features = tableFeatures({
  columnFilteringFeature,
  tableMeta: metaHelper<MyTableMeta>(),
  columnMeta: metaHelper<MyColumnMeta>(),
  filterMeta: metaHelper<MyFilterMeta>(),
})

Replace global FilterFns, SortFns, and AggregationFns augmentation with the matching registry slots; their object keys supply the string-literal names. Replace FilterMeta augmentation with the filterMeta slot unless global behavior is intentional.

12. Migrate adapter construction and rendering separately

The following are breaking but not shared core mappings: adapter hook/factory/controller names, Svelte 5 requirements, reactive getter rules, state-selection components/helpers, and FlexRender syntax. Load the installed adapter's migration skill and follow its exact source. Do not apply React names to Preact, Solid, Svelte, Vue, Angular, or Lit.

Optional v9 adoption after parity

Do not confuse new capabilities with required breakages. After the table works, consider tableOptions() for reusable partial configuration, createTableHook() for app-level table conventions, per-slice atoms/subscriptions for narrower rendering, per-table meta slots, and explicit features for smaller bundles.

Complete audit checklist

• Load the installed framework adapter's migration and table-state skills.
• Replace the v8 adapter constructor/hook/controller with its v9 entrypoint.
• Add a stable features object to every table.
• Inventory every feature API used by table, row, column, cell, and header code; register all 16 required stock features.
• Use stockFeatures only as a temporary parity aid and record an explicit-feature follow-up.
• Remove getCoreRowModel() unless supplying a deliberate custom coreRowModel slot.
• Move all remaining get*RowModel() options or earlier-beta rowModels entries to create*RowModel() feature slots.
• Register each dependent feature before its row-model slot.
• Move filterFns, sortingFns/sortFns, and aggregationFns into feature slots, registering individually imported built-ins; pass no registries to factories.
• Register rowAggregationFeature independently and migrate custom aggregation callables to context-based AggregationFnDef definitions.
• Register columnFilteringFeature before global filtering and filter/facet dependencies.
• Register columnSizingFeature before columnResizingFeature.
• Replace table.getState() and top-level onStateChange according to the adapter state guide.
• Verify every controlled slice has an update path; verify externally owned atoms are reset by their owner.
• Audit destructured, spread, serialized, or bare-callback instance methods.
• Replace every column-pinning left/right key, argument, comparison, method family, and sticky CSS declaration with logical start/end equivalents.
• Split table-level enablePinning; preserve column-def enablePinning where intended.
• Split sizing/resizing features and rename the resizing state, setter, and callback.
• Replace every sortingFn/SortingFn/sortingFns spelling with its v9 sort* spelling.
• Remove every consumed underscore-prefixed internal API.
• Recheck indeterminate selection logic against the new “at least one” semantics.
• Add TFeatures to unavoidable explicit core types, helpers, and retained meta augmentation; otherwise restore inference.
• Replace function-registry and filter-meta declaration merging with per-table slots where appropriate.
• Ensure every row is a record or array under the stricter RowData constraint.
• Migrate adapter-specific rendering, reactive data inputs, and subscription primitives.
• Type-check without any/casts added merely to suppress migration failures.
• Test sorting, filtering, faceting, grouping, expansion, pagination, selection, ordering, pinning, sizing, and resizing—only where enabled.
• Test client/server ownership for every row-model pipeline stage and ensure manual modes receive already-processed data.
• Test LTR and RTL layouts when column pinning or resizing is enabled.
• Remove useLegacyTable after the incremental migration step that required it.

Common migration failures

[CRITICAL] Silencing a missing API instead of registering its feature

If table.nextPage, column.toggleSorting, or a state slice disappears, add the associated feature. Do not cast the table to a broader type.

[CRITICAL] Mixing v8, early-v9-beta, and beta.38 configuration

Do not combine v8 get*RowModel options, an earlier beta's rowModels object, or physical pinning names with the current tableFeatures slots.

[HIGH] Treating stockFeatures or useLegacyTable as the finished migration

Both obscure missing feature decisions; useLegacyTable is deprecated and React-only. Reach behavior parity, then complete the explicit v9 setup.

[HIGH] Copying one adapter's state or rendering API into another

Core concepts are shared, but reactive reads, constructors, and rendering helpers are not. Load the package-local adapter skills.

Installed API discovery

Use the installed version, not main-branch memory:

1. Inspect node_modules/@tanstack/table-core/dist/index.d.ts for exports.
2. Inspect dist/types/TableFeatures.d.ts for valid slots and prerequisites.
3. Inspect dist/features/<feature>/*.types.d.ts for current options, state, and APIs.
4. Inspect the installed adapter's dist/index.d.ts and its migration skill for entrypoints and rendering.
5. Inspect dist/legacy.d.ts only to remove an existing bridge, never to design new v9 code.

If package-manager layout prevents that exact path, resolve the installed package root first. Do not substitute APIs from a different v9 beta.