/** One ```` ```mermaid ```` block of a markdown document. */
export interface MermaidBlock {
    /** Block content, dedented by the fence indentation; no trailing newline. */
    text: string;
    /** 1-based line of the first content line (the line after the opening fence) in the document. */
    line: number;
    /** Number of leading spaces removed from every content line — the column offset of the block. */
    column: number;
    /** Info string of the opening fence: `mermaid`, `mermaid title="Order"`, … */
    info: string;
}
/** A `MermaidBlock` that declares a machine (`%% @machine <id>`). */
export interface StatechartBlock extends MermaidBlock {
    /** Id of the declaration; absent when the directive carries no valid name (the parser reports it). */
    machineId?: string;
    /** 1-based line of the `%% @machine` line in the document. */
    machineLine: number;
}
/** Every ```` ```mermaid ```` block of the document, in source order. */
export declare function extractMermaidBlocks(markdown: string): MermaidBlock[];
/**
 * The mermaid blocks that declare a machine, in source order. Throws when two
 * blocks declare the same id — the document could not be addressed by name.
 */
export declare function findStatechartBlocks(markdown: string): StatechartBlock[];
/** The requested machine, or the first one when `machine` is absent. Throws when the document has nothing to offer. */
export declare function selectStatechartBlock(blocks: readonly StatechartBlock[], machine?: string): StatechartBlock;