fuzzy-ranking

## Setup <!-- skill-snippet:check --> ```ts import { compareItems, rankItem, rankings } from '@tanstack/match-sorter-utils' const query = 'tan' const values = ['table', 'tanner', 'router'] export const ranked = values .map((value) => ({ value, info: rankItem(value, query, { threshold: rankings.MATCHES }), })) .filter((entry) => entry.info.passed) .sort((a, b) => compareItems(a.info, b.info)) ``` ## Core Patterns ### Separate ranking, filtering, and sorting Call `rankItem` once, filter on `info.passed`, retain the `RankingInfo`, then order matching results with `compareItems`. ### Rank object fields through accessors ```ts type Person = { name: string; email: string } const person: Person = { name: 'Ada Lovelace', email: 'ada@example.test' } const info = rankItem(person, 'lov', { accessors: [(item) => item.name, (item) => item.email], }) ``` Accessor options can set a per-accessor threshold plus minRanking/maxRanking bounds. ### Store ranking as Table filter metadata In a Table filterFn, call `addMeta?.({ itemRank })`. Register the corresponding meta shape with `filterMeta: metaHelper<{ itemRank: RankingInfo }>()`. A related sortFn reads `row.columnFiltersMeta[columnId]?.itemRank` and uses `compareItems`, falling back to an ordinary comparator for ties or absent metadata. For the primary Table composition, load `@tanstack/table-core#table-features` and read its global-filtering reference. Register the fuzzy filter under `filterFns` for `globalFilterFn: 'fuzzy'`. ## Common Mistakes ### HIGH Numeric rank used as pass flag Wrong: `if (rankItem(value, query).rank) include(value)`. Correct: test `rankItem(value, query).passed`. Ranks below the configured threshold can still be nonzero; `passed` records the threshold decision. Source: TanStack/table:packages/match-sorter-utils/src/index.ts ### HIGH Ranking recomputed during sorting Wrong: call `rankItem` for both rows on every comparator invocation. Correct: retain RankingInfo during filtering and pass the stored values to `compareItems`. Sorting is called many times; recomputing also risks using different query/options than the filter decision. Source: TanStack/table:docs/framework/react/guide/fuzzy-filtering.md ### MEDIUM compareItems direction reversed twice Wrong: negate `compareItems(a, b)` because a larger rank should appear first. Correct: use `compareItems(a, b)` directly for ascending fuzzy relevance. The function already returns -1 when `a.rank` is greater than `b.rank`. Source: TanStack/table:packages/match-sorter-utils/src/index.ts ## API Discovery Inspect `node_modules/@tanstack/match-sorter-utils/dist/index.d.ts` for the installed `RankItemOptions`, accessor attributes, ranking constants, and comparator behavior. For TanStack Table metadata integration, load `@tanstack/table-core#table-features` and read its global-filtering and sorting references.