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