/**
 * 文字列かどうかを判定する
 * Check if data is a string
 * @param data Data to check
 * @returns True if data is a string
 */
export declare const isString: (data: unknown) => data is string;
/**
 * 文字列かどうかを判定する(配列)
 * Check if data is a string[]
 * @param data Data to check
 * @returns True if data is a string[]
 */
export declare const isStrings: (data: unknown) => data is string[];