/**
 * Structure validator - validates spec structure and required sections
 *
 * Phase 2: Structure Validation
 * - Must have title (H1 heading)
 * - Must have required sections
 * - No empty required sections
 * - No duplicate section headers at same level
 */
import type { ValidationRule, ValidationResult } from '../utils/validation-framework.js';
import type { SpecInfo } from '../types/index.js';
export interface StructureOptions {
    requiredSections?: string[];
    strict?: boolean;
}
export declare class StructureValidator implements ValidationRule {
    name: string;
    description: string;
    private requiredSections;
    private strict;
    constructor(options?: StructureOptions);
    validate(spec: SpecInfo, content: string): Promise<ValidationResult>;
    /**
     * Extract all headings from markdown content (excluding code blocks)
     */
    private extractHeadings;
    /**
     * Find empty sections (sections with no content until next heading)
     */
    private findEmptySections;
    /**
     * Find duplicate headers at the same level
     */
    private findDuplicateHeaders;
}
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