import { TonComment } from "../types";
/**
 * Validates a TON transaction comment (memo).
 *
 * Note: While this function is named `validateMemo` for consistency across
 * coin modules, TON uses a "comment" instead.
 * The validation checks multiple fields, not only text value.
 *
 * @param comment - TON comment object containing text and encryption flag. A missing or
 *   malformed comment is reported invalid rather than throwing, so a bad transaction patch
 *   surfaces as a validation error instead of wedging the send flow.
 * @returns true if the comment is valid, false otherwise
 */
export declare function validateMemo(comment: TonComment | undefined): boolean;
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