/**
 * Sankey Diagram Parser
 *
 * Parses Mermaid sankey diagram syntax into an AST using the vendored JISON parser.
 */
import type { SankeyAST } from '../types/sankey.js';
/**
 * Check if input is a sankey diagram
 */
export declare function isSankeyDiagram(input: string): boolean;
/**
 * Parse sankey diagram syntax into an AST
 * @param input - Mermaid sankey diagram syntax
 * @returns The parsed AST
 */
export declare function parseSankey(input: string): SankeyAST;
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