Function: constructFilterFn()

function constructFilterFn<TFeatures, TData>(def): CreatedFilterFn<TFeatures, TData>;

Defined in: features/column-filtering/filterFns.ts:40

Builds a FilterFn from a value-level comparator plus optional resolvers.

The filter comparator receives the row's data value (already passed through resolveDataValue when one is defined) and the filter value (already passed through resolveFilterValue by the table). Keeping normalization in the resolvers means a variant of an existing filter function only has to swap the resolvers, not re-implement the comparison.

The definition is attached to the returned function, so a variant can be created by spreading a built-in filter function and overriding what differs:

const normalize = (value: unknown) =>
  String(value ?? '')
    .toLowerCase()
    .normalize('NFD')
    .replace(/\p{Diacritic}/gu, '')

const includesStringIgnoreDiacritics = constructFilterFn({
  ...filterFn_includesString,
  resolveFilterValue: normalize,
  resolveDataValue: normalize,
})

Note: the table applies resolveFilterValue once per filter before any rows are tested. When calling a filter function directly (outside of a table), apply it yourself: fn(row, columnId, fn.resolveFilterValue?.(value) ?? value).