/**
 * cfcs
 * Copyright (c) 2022-present NAVER Corp.
 * MIT license
 */
/**
 * @hidden
 */
export declare function keys<T extends Record<string, any>>(obj: T): Array<keyof T>;
/**
 * @hidden
 */
export declare function camelize(str: string): string;
/**
 * @hidden
 */
export declare function isString(val: any): val is string;
/**
 * @hidden
 */
export declare function isObject(val: any): val is object;
/**
 * @hidden
 */
export declare function isFunction(val: any): val is Function;