import { type Writable } from 'svelte/store';
import type { BodyRow } from '../bodyRows.js';
import type { NewTablePropSet, TablePlugin } from '../types/TablePlugin.js';
/**
 * Configuration options for the addFlatten plugin.
 */
export interface FlattenConfig {
    /** Initial depth to flatten. 0 means no flattening. Defaults to 0. */
    initialDepth?: number;
}
/**
 * State exposed by the addFlatten plugin.
 */
export interface FlattenState {
    /** Writable store for the current flatten depth. */
    depth: Writable<number>;
}
/**
 * Column options for the flatten plugin (currently empty).
 *
 * @template _Item - The type of data items (unused).
 */
export type FlattenColumnOptions<_Item> = Record<string, never>;
/**
 * Props added to table cells by the flatten plugin.
 */
export type FlattenPropSet = NewTablePropSet<{
    'tbody.tr.td': {
        /** Function to set the flatten depth. */
        flatten: (_depth: number) => void;
        /** Function to reset flattening (set depth to 0). */
        unflatten: () => void;
    };
}>;
/**
 * Recursively extracts rows at a specific depth from the hierarchy.
 *
 * @template Item - The type of data items.
 * @template Row - The row type.
 * @param rows - The rows to flatten.
 * @param depth - The depth to extract (0 returns current level).
 * @returns The flattened rows array.
 */
export declare const getFlattenedRows: <Item, Row extends BodyRow<Item>>(rows: Row[], depth: number) => Row[];
/**
 * Creates a flatten plugin that enables displaying rows at a specific depth level.
 * Useful for showing only leaf nodes or a specific level of hierarchical data.
 *
 * @template Item - The type of data items in the table.
 * @param config - Configuration options.
 * @returns A TablePlugin that provides flattening functionality.
 * @example
 * ```typescript
 * const table = createTable(data, {
 *   flatten: addFlatten({
 *     initialDepth: 0 // Start with no flattening
 *   })
 * })
 *
 * // Flatten to show only first-level children
 * table.pluginStates.flatten.depth.set(1)
 * ```
 */
export declare const addFlatten: <Item>({ initialDepth }?: FlattenConfig) => TablePlugin<Item, FlattenState, FlattenColumnOptions<Item>, FlattenPropSet>;