filter function type

In the FilterFn documentation there is this writing:

export type FilterFn<TData extends AnyData> = {
  (
    row: Row<TData>,
    columnId: string,
    filterValue: any,
    addMeta: (meta: any) => void
  ): boolean
  resolveFilterValue?: TransformFilterValueFn<TData>
  autoRemove?: ColumnFilterAutoRemoveTestFn<TData>
  addMeta?: (meta?: any) => void
}

export type FilterFn<TData extends AnyData> = {
  (
    row: Row<TData>,
    columnId: string,
    filterValue: any,
    addMeta: (meta: any) => void
  ): boolean
  resolveFilterValue?: TransformFilterValueFn<TData>
  autoRemove?: ColumnFilterAutoRemoveTestFn<TData>
  addMeta?: (meta?: any) => void
}

export type FilterFn<TData extends AnyData> = {
  (
    row: Row<TData>,
    columnId: string,
    filterValue: any,
    addMeta: (meta: any) => void
  ): boolean
  resolveFilterValue?: TransformFilterValueFn<TData>
  autoRemove?: ColumnFilterAutoRemoveTestFn<TData>
  addMeta?: (meta?: any) => void
}

export type FilterFn<TData extends AnyData> = {
  (
    row: Row<TData>,
    columnId: string,
    filterValue: any,
    addMeta: (meta: any) => void
  ): boolean
  resolveFilterValue?: TransformFilterValueFn<TData>
  autoRemove?: ColumnFilterAutoRemoveTestFn<TData>
  addMeta?: (meta?: any) => void
}

Is that correct typescript? if so, I never seen this kind of declaration before.. Should'n you declare function type with something like

type FilterFn = (row: Row<TData>, ....) => boolean

type FilterFn = (row: Row<TData>, ....) => boolean

type FilterFn = (row: Row<TData>, ....) => boolean

type FilterFn = (row: Row<TData>, ....) => boolean

?
https://tanstack.com/table/v8/docs/api/features/filters

Filters | TanStack Table Docs

Can-Filter

The ability for a column to be column filtered is determined by the following:

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