/**
 * Returns initials from the first two words of a name. Returns "X" for invalid input.
 *
 * @param name - The full name string.
 * @returns Initials of the first two words, or "X" if invalid.
 *
 * Example:
 * getInitialsFromName("John Doe") -> "JD"
 * getInitialsFromName("Jane") -> "J"
 * getInitialsFromName("") -> "X"
 */
export declare const getInitialsFromName: (name: string) => string | null;
/**
 * Limits the full name to the first two words. Returns null for invalid input.
 *
 * @param fullName - The full name string to be limited.
 * @returns The first two words of the full name, or null if invalid.
 *
 * Example:
 * limitFullName("John Doe Smith") -> "John Doe"
 * limitFullName("Jane") -> "Jane"
 * limitFullName("") -> null
 */
export declare const limitFullName: (fullName: string) => string | null;