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