/**
 * Change Detector - Identifies content changes between page versions
 *
 * Useful for:
 * - Detecting when government websites update their content
 * - Flagging stale knowledge base entries
 * - Tracking regulatory changes
 */
export interface ContentFingerprint {
    hash: string;
    textLength: number;
    wordCount: number;
    structureHash: string;
    timestamp: number;
}
export interface ContentChange {
    type: 'added' | 'removed' | 'modified';
    section?: string;
    oldValue?: string;
    newValue?: string;
    significance: 'low' | 'medium' | 'high';
}
export interface ChangeReport {
    hasChanges: boolean;
    overallSignificance: 'none' | 'low' | 'medium' | 'high';
    changes: ContentChange[];
    oldFingerprint: ContentFingerprint;
    newFingerprint: ContentFingerprint;
    summary: string;
}
/**
 * Create a fingerprint of content for comparison
 */
export declare function createFingerprint(content: string): ContentFingerprint;
/**
 * Compare two fingerprints for quick change detection
 */
export declare function hasContentChanged(oldFingerprint: ContentFingerprint, newFingerprint: ContentFingerprint): boolean;
/**
 * Get significance of changes based on fingerprint comparison
 */
export declare function getChangeSignificance(oldFingerprint: ContentFingerprint, newFingerprint: ContentFingerprint): 'none' | 'low' | 'medium' | 'high';
/**
 * Detailed comparison between two content versions
 */
export declare function compareContent(oldContent: string, newContent: string): ChangeReport;
/**
 * Extract key numbers/values from content for comparison
 * Useful for detecting threshold changes
 */
export declare function extractKeyValues(content: string): Map<string, string>;
/**
 * Compare key values between two versions
 */
export declare function compareKeyValues(oldContent: string, newContent: string): {
    changed: boolean;
    differences: {
        type: string;
        old: string;
        new: string;
    }[];
};
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