/**
 * @title isString
 * @description 是字符串
 * @param value {unknown}
 * @returns {boolean}
 */
export declare function isString(value: unknown): value is string;
/**
 * @title isJsonString<T>
 * @description 是json字符串, 若是并返回处理后的对象
 * @param val 待判断字符串
 * @returns T | false
 */
export declare function isJsonString<T extends Record<string, unknown>>(val: unknown): T | false;
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