/**
 * Masks all email addresses found within a given subject string.
 *
 * This utility searches the input text for any email-like patterns and replaces
 * each one using the {@link maskEmail} function, preserving the rest of the string.
 * It is typically used to sanitize or anonymize email addresses before logging,
 * displaying, or transmitting text content.
 *
 * @param subject - The text that may contain one or more email addresses.
 * @returns A new string with all detected email addresses masked.
 */
export declare const maskSubject: (subject: string) => string;
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