import { ComputedRef, Ref } from 'vue';
import { Key } from '../types';
export interface FlattenRow<TRecord = Record<string, unknown>> {
    /** Original data record */
    record: TRecord;
    /** Nesting depth (0 = root) */
    level: number;
    /** Whether this row is currently expanded */
    expanded: boolean;
    /** Whether this row has child rows */
    hasChildren: boolean;
    /** Parent row key (undefined for root rows) */
    parentKey?: Key;
}
export interface UseTreeDataOptions<TRecord = Record<string, unknown>> {
    /** Data source accessor */
    data: () => TRecord[];
    /** Field name for children, defaults to 'children' */
    childrenColumnName?: () => string | undefined;
    /** Indent size in pixels, defaults to 15 */
    indentSize?: () => number | undefined;
    /** Row key resolver */
    getRowKey: (record: TRecord, index: number) => Key;
    /** Default expanded keys (uncontrolled) */
    defaultExpandedRowKeys?: () => Key[] | undefined;
    /** Controlled expanded keys */
    expandedRowKeys?: () => Key[] | undefined;
    /** Whether to expand all rows by default */
    defaultExpandAllRows?: () => boolean | undefined;
    /** Expand/collapse callback */
    onExpand?: (expanded: boolean, record: TRecord) => void;
    /** Expanded keys change callback */
    onExpandedRowsChange?: (expandedKeys: Key[]) => void;
}
export interface UseTreeDataReturn<TRecord = Record<string, unknown>> {
    /** Flattened visible rows */
    flattenData: ComputedRef<FlattenRow<TRecord>[]>;
    /** Whether tree mode is active (data has children) */
    isTreeData: ComputedRef<boolean>;
    /** Toggle a row's expanded state */
    toggleTreeExpand: (record: TRecord, index: number) => void;
    /** Check if a row is expanded */
    isTreeExpanded: (key: Key) => boolean;
    /** Current expanded keys */
    expandedKeys: Ref<Set<Key>>;
    /** Indent size in px */
    indentSize: ComputedRef<number>;
}
export declare function useTreeData<TRecord extends Record<string, unknown> = Record<string, unknown>>(options: UseTreeDataOptions<TRecord>): UseTreeDataReturn<TRecord>;
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