import { type ReactNode } from 'react';
import type { BaseProps, DataSourceItem, NormalizedObjectItem, ObjectItem } from './types';
/**
 * util module
 */
/**
 * 是否是单选模式
 * @param mode - 模式
 * @returns is single mode
 */
export declare function isSingle(mode?: string | null): boolean;
/**
 * 在 Select 中，认为 null 和 undefined 都是空值
 * @param n - any object
 * @returns n is null or undefined
 */
export declare function isNull(n?: unknown): n is null | undefined;
/**
 * 将字符串中的正则表达式关键字符添加转义
 * @param str - 字符串
 * @returns
 */
export declare function escapeForReg(str: string): string;
/**
 * filter by key
 * @param key - filter key
 * @param item - item object
 * @returns it's filtered
 */
export declare function filter(key: string | number, item: ObjectItem): boolean;
/**
 * loop map
 * @param dataSource - 数据源
 * @param callback - 回调
 */
export declare function loopMap(dataSource: NormalizedObjectItem[], callback: (option: NormalizedObjectItem) => NormalizedObjectItem | undefined | null | false): NormalizedObjectItem[];
/**
 * Parse dataSource from MenuItem
 * @param children - children
 * @param deep - recursion deep level
 */
export declare function parseDataSourceFromChildren(children: ReactNode, deep?: number): NormalizedObjectItem[];
export declare function isObjectDataSourceItem(item: DataSourceItem): item is ObjectItem;
/**
 * Normalize dataSource
 * @param dataSource - dataSource
 * @param deep -  recursion deep level
 * ----
 * value priority: value \> 'index'
 * label priority: label \> 'value' \> 'index'
 * disabled: disabled === true
 */
export declare function normalizeDataSource(dataSource: DataSourceItem[], deep?: number, showDataSourceChildren?: boolean): NormalizedObjectItem[];
/**
 * Get flatten dataSource
 * @param dataSource - structured dataSource
 */
export declare function flattingDataSource(dataSource: NormalizedObjectItem[]): NormalizedObjectItem[];
export declare function filterDataSource(dataSource: NormalizedObjectItem[] | undefined, key: string | number | undefined | null, filter: (key: string | number, item: NormalizedObjectItem) => boolean, addonKey?: boolean): NormalizedObjectItem[];
/**
 * compute valueDataSource by new value
 * @param value - 数据
 * @param mapValueDS - 上个 value 的缓存数据 value =\> \{value,label\} 的映射关系表
 * @param mapMenuDS - 通过 dataSource 建立 value =\> \{value,label\} 的映射关系表
 * @returns value: [value]; valueDS: [\{value,label\}]; mapValueDS: \{value: \{value,label\}\}
 */
export declare function getValueDataSource(value: BaseProps['value'], mapValueDS?: Record<string, ObjectItem>, mapMenuDS?: Record<string, ObjectItem>): {
    value?: ObjectItem['value'][] | ObjectItem['value'];
    valueDS?: ObjectItem | ObjectItem[];
    mapValueDS?: Record<string, ObjectItem>;
};
/**
 * Get Selected key from value
 * @param value - structured dataSource
 * @returns
 */
export declare function valueToSelectKey(value: DataSourceItem): ObjectItem['value'];
/**
 * Generate group key
 * @param index - index
 * @param itemValueSet - item value set
 * @returns group key
 */
export declare function generateGroupKey(index: number, itemValueSet: Set<string>): string;