/**
 * Removes objects from an array where the parent attribute is not null.
 * @param {Array<Object>} arr - The array of objects.
 */
export function removeChildren(arr: Array<Object>): void;
/**
 * Flatten nested children arrays within an array of objects.
 * @param {Array<Object>} arr - The array of objects.
 */
export function flattenNestedChildren(arr: Array<Object>): void;
/**
 * Applies a hierarchical filter to an array of objects.
 * @param {Array<Object>} arr - The array of objects.
 * @param {Function} filterFn - The filter function to apply on each object.
 */
export function hierarchicalFilter(arr: Array<Object>, filterFn: Function): void;
/**
 * Derives the hierarchy from the data.
 *
 * @param {Array} data - The data to derive the hierarchy from.
 * @param {string} path - The column name to be used as hierarchical path.
 * @param {string} separator - The separator to be used in the path.
 * @returns {Array<import('./types').Hierarchy>} - The derived hierarchy.
 */
export function deriveHierarchy(data: any[], options: any): Array<import("./types").Hierarchy>;
/**
 * Toggles the expansion state of a node and updates the visibility of its children accordingly.
 * If the node is a parent (has child nodes), it will invert its 'isExpanded' property and call
 * 'changeVisibilityForChildren' to reflect changes to its child nodes.
 *
 * @param {Object} node - The node to toggle expansion for. The node is expected to have an
 *                        'isParent' property indicating if the node has children, an
 *                        'isExpanded' property indicating if the node is expanded, and an array
 *                        of child nodes under the 'children' property if it is a parent.
 */
export function toggleExpansion(node: Object): void;