/**
 * Converts a string to title case.
 *
 * @param text - The input string.
 * @returns The string converted to title case.
 */
declare function titleCase(text: string): string;
/**
 * Generates a random string based on the provided seed, length, and character set.
 *
 * @param seed - The seed value used for generating the random string.
 * @param length - The length of the random string to be generated.
 * @param charSet - The character set from which the random string will be composed.
 * @returns The randomly generated string.
 */
declare function generateRandomString(seed: string, length: number, charSet: string): string;
/**
 * Generate a full name by combining first name and last name.
 *
 * @param firstName - The first name (optional).
 * @param lastName - The last name (optional).
 * @returns The full name as a string.
 */
declare function fullName(firstName?: string, lastName?: string): string;
/**
 * Trims leading and trailing whitespace from a string.
 *
 * @param text - The string to trim.
 * @returns The trimmed string, or `null` if the input string is empty or `null`.
 */
declare function trimString(text?: string): string;
/**
 * Checks if the given data is a valid JSON string.
 *
 * @param data - The data to be checked.
 * @returns A boolean indicating whether the data is a valid JSON string.
 */
declare function isJSON(data: any): boolean;
/**
 * Checks if a value is a string.
 *
 * @param value - The value to check.
 * @returns Returns `true` if the value is a string, `false` otherwise.
 */
declare function isString(value: any): boolean;
/**
 * Determines whether the provided value is a string and is empty.
 *
 * @param value - The value to check.
 * @returns `true` if the value is a string and is empty (`''`), otherwise `false`.
 *
 * @remarks
 * This function first checks if the value is a string using `isString`, and then verifies that it is an empty string.
 *
 * @example
 * ```typescript
 * isEmptyString(""); // true
 * isEmptyString("hello"); // false
 * isEmptyString(null); // false
 * ```
 */
declare function isEmptyString(value: any): boolean;
export { fullName, generateRandomString, isJSON, isString, titleCase, trimString, isEmptyString };