type EmailNormalizationOptions = {
    gmailAlias?: boolean;
};
/**
 * Trim, strip invisible chars, collapse ASCII whitespace, NFC, lowercase — storage + lookup.
 */
declare function normalizeEmail(input: string, options?: EmailNormalizationOptions): string;
declare function normalizeGmailAliasEmail(input: string, options?: EmailNormalizationOptions): string | null;

export { type EmailNormalizationOptions, normalizeEmail, normalizeGmailAliasEmail };
