import type { MermaidProcessResult } from "./types.js";
/**
 * Find the mmdc binary. Since @mermaid-js/mermaid-cli is a bundled dependency,
 * mmdc is installed alongside md2cf. This function searches:
 *   1. Sibling to the running script (same .bin dir as md2cf)
 *   2. CWD's node_modules/.bin (development / monorepo)
 *   3. Global PATH (fallback)
 *
 * Returns the path to mmdc or null if not found.
 */
export declare function findMmdc(): string | null;
/**
 * Render a mermaid code block to a PNG image using the mmdc CLI.
 * Returns an object with the PNG buffer and filename on success, or an error on failure.
 */
export declare function renderMermaidToPng(mermaidCode: string, index: number, mmdcPath: string): {
    success: true;
    pngBuffer: Buffer;
    filename: string;
} | {
    success: false;
    error: string;
};
/**
 * Check if a markdown string contains any mermaid code blocks.
 */
export declare function hasMermaidBlocks(markdown: string): boolean;
/**
 * Extract mermaid code blocks from markdown, render each to PNG,
 * and replace the blocks with placeholder strings.
 *
 * Placeholders follow the pattern: MERMAID_DIAGRAM_PLACEHOLDER_0, MERMAID_DIAGRAM_PLACEHOLDER_1, etc.
 * Failed renders use: MERMAID_ERROR_PLACEHOLDER_0, etc.
 *
 * Returns the modified markdown and the processed blocks with PNG data.
 */
export declare function processMermaidBlocks(markdown: string, mmdcPath: string): MermaidProcessResult;
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