import { IntoUndefined, SetDataEvent, UnsetDataEvent } from '@vunk/core/shared/types';
/**
 *
 * @param obj 数据源
 * @param k 取值的 key
 * @param intoUndefined 若在取值的过程中发现当前取得的值是一个 undefined，那么会调用此函数
 * @param safe 若为 true, 若当前取得的值是一个 undefined或null，那么会直接返回
 * @returns
 */
export declare const getValue: (obj: any, k: any, intoUndefined?: IntoUndefined, safe?: boolean) => any;
export declare const setData: (obj: any, e: SetDataEvent) => void;
export declare const unsetData: (obj: any, e: UnsetDataEvent) => void;
export declare const defaultIntoUndefined: IntoUndefined;
/**
 * setData with defaultIntoUndefined
 * @param obj
 * @param e
 */
export declare const ensetData: (obj: any, e: SetDataEvent) => void;