import { default as NDK } from '@nostr-dev-kit/ndk';
import { Theme } from './types';
export declare const decodeNpub: (npub: string) => string;
/**
 * Convert hex pubkey to npub
 */
export declare function hexToNpub(hex: string): string;
export declare const decodeNip19Entity: (entity: string) => any;
export declare function maskNPub(npubString?: string, length?: number): string;
export type Stats = {
    likes: number;
    reposts: number;
    zaps: number;
    replies: number;
};
export declare function getPostStats(ndk: NDK, postId: string): Promise<Stats>;
export declare function parseRelays(relaysAttr: string | null): string[];
export declare function parseTheme(themeAttr: string | null): Theme;
export declare function parseBooleanAttribute(attr: string | null): boolean;
export declare function escapeHtml(text: string): string;
export declare function isValidUrl(url: string): boolean;
export declare function isValidRelayUrl(url: string): boolean;
export declare function isValidHex(hex: string): boolean;
export declare function validateNpub(npub: string): boolean;
export declare function validateNip05(nip05: string): boolean;
export declare function validateNoteId(noteId: string): boolean;
export declare function validateEventId(eventId: string): boolean;
export declare function copyToClipboard(text: string): Promise<void>;
/**
 * Get the first value of a tag by tag name
 * @param tags Array of tag arrays from NDKEvent
 * @param tagName The tag name to search for (e.g., 'd', 'title')
 * @param index Index of the tag occurrence (0 for first)
 * @returns The tag value or undefined if not found
 */
export declare function getTagValue(tags: string[][], tagName: string, index?: number): string | undefined;
/**
 * Get all values for a tag by tag name
 * @param tags Array of tag arrays from NDKEvent
 * @param tagName The tag name to search for (e.g., 't', 'relays')
 * @returns Array of all values for the tag (excluding the tag name itself)
 */
export declare function getTagValues(tags: string[][], tagName: string): string[];
/**
 * Parse a timestamp string to a number
 * @param value String value to parse
 * @returns Unix timestamp as number, or undefined if invalid
 */
export declare function parseTimestamp(value: string | undefined): number | undefined;
/**
 * Parse a number string to a number
 * @param value String value to parse
 * @returns Number or undefined if invalid
 */
export declare function parseNumber(value: string | undefined): number | undefined;
/**
 * Format timestamp as relative time (e.g., "2 mins ago", "1 month ago")
 * @param ts Timestamp in seconds
 * @returns Formatted relative time string
 */
export declare function formatRelativeTime(ts: number): string;