/**
 * Quadrant Chart Parser
 *
 * Parses Mermaid quadrant chart syntax into an AST using the vendored JISON parser.
 */
import type { QuadrantAST } from '../types/quadrant.js';
/**
 * Check if input is a quadrant chart
 */
export declare function isQuadrantDiagram(input: string): boolean;
/**
 * Parse quadrant chart syntax into an AST
 * @param input - Mermaid quadrant chart syntax
 * @returns The parsed AST
 */
export declare function parseQuadrant(input: string): QuadrantAST;
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