sorting

This skill builds on `core`, `table-features`, and `client-vs-server`. Sorting state describes order; client processing requires a sorted model and server processing requires sorted input. ## Setup ```ts import { createSortedRowModel, rowSortingFeature, sortFn_alphanumeric, sortFn_text, tableFeatures, } from '@tanstack/table-core' export const features = tableFeatures({ rowSortingFeature, sortedRowModel: createSortedRowModel(), sortFns: { alphanumeric: sortFn_alphanumeric, text: sortFn_text }, }) ``` Import individual `sortFn_*` built-ins and register only those your columns reference by string name or that `sortFn: 'auto'` should resolve for your data types. The full `sortFns` registry object still works but bundles every built-in; numeric columns fall back to a basic comparator without registration. ## Core Patterns ```ts const options = { enableSortingRemoval: false, enableMultiSort: true } const numericColumn = { sortUndefined: 'last' as const } ``` Configure sort cycles and undefined placement to match the product rather than relying on implicit defaults. ## Common Mistakes ### [CRITICAL] Expecting manual mode to reorder Wrong: `const options = { data: unsortedRows, manualSorting: true }` Correct: `const options = { data: serverSortedRows, manualSorting: true }` Manual sorting bypasses `sortedRowModel` and trusts incoming order. Source: `packages/table-core/src/features/row-sorting/rowSortingFeature.types.ts` ### [HIGH] Reversing inside the comparator Wrong: `const newest: SortFn<any, any> = (a, b, id) => b.getValue<number>(id) - a.getValue<number>(id)` Correct: `const numeric: SortFn<any, any> = (a, b, id) => a.getValue<number>(id) - b.getValue<number>(id)` Return ascending comparison only; Table reverses it when sorting is descending. Source: `docs/framework/react/guide/sorting.md#custom-sorting-functions` ### [MEDIUM] Leaving ambiguous sort policy Wrong: `const options = { enableSortingRemoval: true }` Correct: `const options = { enableSortingRemoval: false }; const rankColumn = { sortUndefined: 'last' as const }` Undefined placement and removal cycles can differ from expected product behavior unless configured. Source: `packages/table-core/src/features/row-sorting/rowSortingFeature.types.ts` ## API Discovery Inspect `node_modules/@tanstack/table-core/dist/features/row-sorting/` and `dist/features/row-sorting/sortFns.d.ts` for current names and comparator contracts.