import type { AgentDiagramData } from '../../types/diagram.js';
/**
 * Parse mermaid source into an `AgentDiagramData`. Supports `flowchart`/`graph`
 * (with subgraphs and the full shape vocabulary) and `erDiagram`. The optional
 * `title:` from a YAML frontmatter block is honored.
 */
export declare function mermaidToDiagram(source: string): AgentDiagramData;
/** Extract the first ```mermaid fenced block from markdown, or null if none. */
export declare function extractMermaidFromMarkdown(markdown: string): string | null;
/**
 * Parse markdown: route its first ```mermaid``` fence through {@link mermaidToDiagram}.
 * Throws if the markdown carries no mermaid block.
 */
export declare function markdownToDiagram(markdown: string): AgentDiagramData;