export interface TravelCallbackInfo {
    keyPath: string;
    depth: number;
    type: string;
    isCircular: boolean;
    isSpreadable: boolean;
    isFirst: boolean;
    isLast: boolean;
}
export type TravelCallback = (key: string, value: any, info?: Partial<TravelCallbackInfo>) => void;
/**
 * 递归遍历一个json
 * @param {Object} json
 * @param {Function} cb callback(key,val,curKeyPath,typeStr,isComplexObj,curDepth,isCircular) and context is parent obj
 * @param {string} rootAlias
 * @param {Boolean} safeMode default is true
 * @returns {Array} keysArr
 */
export declare function travelJson(json: any, cb?: TravelCallback, rootAlias?: string, safeMode?: boolean): string[];