export interface DiagramEdge {
    from: string;
    to: string;
    label?: string;
}
export interface DiagramIR {
    /** section heading the diagram lives under (null = preamble) */
    section: string | null;
    kind: string;
    known: boolean;
    nodes: string[];
    edges: DiagramEdge[];
    source: string;
}
export declare const KNOWN_KINDS: Set<string>;
export declare function diagramKind(source: string): string;
export declare function parseMermaid(source: string, section: string | null): DiagramIR;
/** Extract ```mermaid fences from a section's markdown (fence-aware upstream). */
export declare function extractMermaidBlocks(md: string): string[];