export type FilterColumn = {
    kind: 'filters';
    colId: number;
    /** Discrete values that pass the filter. Stored as strings to match the wire format. */
    values: string[];
    /** Whether blanks are visible. */
    blank?: boolean;
};
export interface AutoFilter {
    /** Excel range the filter covers (`"A1:E100"`). */
    ref: string;
    filterColumns: FilterColumn[];
}
export declare function makeAutoFilter(opts: {
    ref: string;
    filterColumns?: FilterColumn[];
}): AutoFilter;
export declare function makeFilterColumn(opts: {
    colId: number;
    values: ReadonlyArray<string>;
    blank?: boolean;
}): FilterColumn;
import type { Worksheet } from './worksheet';
/** Add an AutoFilter dropdown header strip to the given range. */
export declare const addAutoFilter: (ws: Worksheet, ref: string) => AutoFilter;
/**
 * Add a value-list dropdown filter to a column inside the existing AutoFilter
 * range. `colId` is 0-based relative to the AutoFilter left edge.
 */
export declare const addAutoFilterColumn: (ws: Worksheet, colId: number, values: ReadonlyArray<string>, opts?: {
    blank?: boolean;
}) => FilterColumn;
/** Drop the worksheet's AutoFilter entirely. */
export declare const removeAutoFilter: (ws: Worksheet) => void;