/**
 * Spam detection helper for email addresses.
 * Detects artificially generated email addresses using linguistic heuristics.
 */
/**
 * Checks if an email address appears to be spam/generated.
 *
 * Spam characteristics detected:
 * - Unusually long local part (16+ characters before @)
 * - Low vowel ratio (< 35%) - real words typically have higher vowel density
 * - High uppercase ratio (> 30%) - indicating random capitalization
 * - High consonant cluster ratio - many consecutive consonants
 * - Repeated character patterns (e.g., "aaaa", "xxx")
 * - Random-looking character sequences
 *
 * @param email - The email address to validate
 * @returns true if the email appears to be spam, false otherwise
 *
 * @example
 * isSpamEmail("FalDxivcRyvFRbMU@example.com") // true
 * isSpamEmail("john.doe@example.com") // false
 */
export declare function isSpamEmail(email: string): boolean;
/**
 * Checks if an email address local part appears to be spam/generated.
 * This is an alias for isSpamEmail with a more descriptive name.
 *
 * @param email - The email address to validate
 * @returns true if the email local part appears to be spam, false otherwise
 */
export declare function isSpamEmailLocalPart(email: string): boolean;