import type { FlatReqFilter } from "./query-optimizer";
import type { NostrEvent, ReqFilter } from "./nostr";
export declare function findTag(e: NostrEvent, tag: string): string | undefined;
export declare function findWholeTag(e: NostrEvent, tag: string): string[] | undefined;
export declare function reqFilterEq(a: FlatReqFilter | ReqFilter, b: FlatReqFilter | ReqFilter): boolean;
export declare function flatFilterEq(a: FlatReqFilter, b: FlatReqFilter): boolean;
export declare const UrlRegex: RegExp;
export declare function splitByUrl(str: string): string[];
/**
 * Image file extensions
 */
export declare const ImageExtensions: string[];
/**
 * Audio file extensions
 */
export declare const AudioExtensions: string[];
/**
 * Video file extensions
 */
export declare const VideoExtensions: string[];
/**
 * Converts a file extension into mime type string
 */
export declare function extensionToMime(e: string): string | undefined;
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