import { ParseMode } from '../tools/markdownConverter.js';
/**
 * Markdown Splitter Utility
 * Splits large markdown documents into chunks to avoid Telegram API length limits
 *
 * Strategy:
 * 1. Convert markdown to target format (HTML or MarkdownV2) to get real size
 * 2. If >= 4000 chars (Telegram's 4096 limit - 96 safety margin), split the markdown
 * 3. Find split points (---, #-headers, or newlines)
 * 4. Add page numbers (1/5, 2/5, etc.)
 */
export interface SplitMarkdownResult {
    chunks: string[];
    isSplit: boolean;
    originalLength: number;
    actualHtmlLength: number;
    chunkCount: number;
}
/**
 * Split markdown into chunks considering actual converted size
 * @param markdown Original markdown text
 * @param parseMode Target format for size measurement (default: 'HTML')
 * @returns Split result with chunks and metadata
 */
export declare function splitMarkdown(markdown: string, parseMode?: ParseMode): SplitMarkdownResult;
/**
 * Add page numbers to chunks
 * e.g., "Content here\n\n---\n**(1/5)**"
 */
export declare function addPageNumbers(chunks: string[]): string[];
/**
 * Prepare markdown chunks for sequential sending
 * Includes splitting, page numbering, and validation
 */
export declare function prepareMarkdownChunks(markdown: string, parseMode?: ParseMode): string[];
/**
 * Calculate delay for sending (in milliseconds)
 * Telegram rate limiting: avoid sending too fast
 */
export declare function getSequentialSendDelay(): number;