import { NDKEvent } from '@nostr-dev-kit/ndk';
export interface CommentEvent {
    id: string;
    pubkey: string;
    content: string;
    created_at: number;
    tags: string[][];
    sig: string;
}
export interface ParsedComment {
    id: string;
    pubkey: string;
    content: string;
    created_at: number;
    replyTo?: string;
    rootUrl?: string;
}
/**
 * Normalize URL for consistent comment identification
 */
export declare function normalizeURL(raw: string): string;
/**
 * Parse Nostr event into comment structure
 */
export declare function parseCommentEvent(event: NDKEvent): ParsedComment | null;
/**
 * Create a comment event for publishing
 */
export declare function createCommentEvent(content: string, pubkey: string, url: string, replyTo?: string): Omit<CommentEvent, 'id' | 'sig'>;
/**
 * Validate if a string is a valid Nostr public key
 */
export declare function isValidPublicKey(pubkey: string): boolean;
/**
 * Validate if a string is a valid Nostr event ID
 */
export declare function isValidEventId(eventId: string): boolean;
/**
 * Truncate public key for display
 */
export declare function truncatePublicKey(pubkey: string, length?: number): string;
/**
 * Format timestamp to relative time
 */
export declare function formatRelativeTime(timestamp: number): string;
/**
 * Sanitize HTML content to prevent XSS
 */
export declare function sanitizeContent(content: string): string;
/**
 * Parse URLs in content and make them clickable
 */
export declare function linkifyContent(content: string): string;
/**
 * Generate a simple hash for content deduplication
 */
export declare function hashContent(content: string, pubkey: string): string;
/**
 * Check if user has a Nostr extension (NIP-07)
 */
export declare function hasNostrExtension(): boolean;
/**
 * Get stored private key from localStorage
 */
export declare function getStoredPrivateKey(): string | null;
/**
 * Store private key in localStorage
 */
export declare function storePrivateKey(privateKey: string): boolean;
/**
 * Validate if a string is a valid private key
 */
export declare function isValidPrivateKey(privateKey: string): boolean;
/**
 * Clear stored private key (for logout functionality)
 */
export declare function clearStoredPrivateKey(): void;
/**
 * Debounce function for rate limiting
 */
export declare function debounce<T extends (...args: any[]) => any>(func: T, wait: number): (...args: Parameters<T>) => void;