type IHumpObject = Record<string, any> | Array<any>;
/**
 * 将对象中的key由下划线专为驼峰
 *
 * @param {object} obj - 对象
 * @returns {object} 转化后的对象
 *
 * @example
 * const obj = {
 *   a_a: 'a',
 *   b_b: [
 *     {
 *       bb_b: 'b',
 *     },
 *   ],
 *   c: {
 *     dd_d: 'd',
 *     e: {
 *       ee_e: 'e',
 *     },
 *   },
 * };
 *
 * toHumpObj(obj);
 * // { aA: 'a', bB: [ { bbB: 'b' } ], c: { ddD: 'd', e: { eeE: 'e' } } }
 */
export declare function toHumpObj(obj: IHumpObject, cache?: WeakMap<object, any>): object;
/**
 * 将属性混合到目标对象中
 * @param {object} to 目标对象
 * @param {object} from 原始对象
 * @returns 处理后的对象
 *
 * @example
 * const a = { name: 'lee' }
 * const b = { age: 3 }
 * extend(a, b)
 *
 * console.log(a)
 *
 * // => { name: 'lee', age: 3 }
 */
export declare function extend(to: Record<string, any>, from: Record<string, any>): object;
export {};