/**
 * Feishu message `content`: how an authored body becomes one, and how big one
 * may be.
 *
 * A reply is an interactive card holding one `markdown` element with the
 * authored Markdown as written. A card is the presentation because the
 * client shows card text in its compact size; a native post shows the same
 * text larger. Card Markdown renders the authored `<at user_id="…">Name</at>`
 * mention tag as it is, so nothing here rewrites the body.
 *
 * The only reason a body is ever cut is size. The budget is measured on the
 * serialized `content` string, JSON escaping included, because that is what
 * the platform receives.
 */
/**
 * The serialized-content budget for one message, under the platform's
 * documented 30 KB ceiling. One budget covers rendered and raw cards alike:
 * they are the same `content` field.
 */
export declare const FEISHU_MESSAGE_CONTENT_SAFE_BYTES: number;
/**
 * Serialize one authored body into the card contents to send, in order. The
 * whole body is tried first: a body that fits is one message no matter how
 * many Markdown blocks it holds.
 */
export declare function cardContents(body: string): string[];
export declare function assertMessageContentFits(content: string): void;
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