import { default as NDK, NDKEvent, NDKFilter, NostrEvent } from '@nostr-dev-kit/ndk';
import { Site, StoreObject } from '.';

export declare function isBlossomUrl(u: string): boolean;
export declare function findImeta(event: NostrEvent, u: string): import('@nostr-dev-kit/ndk').NDKTag | undefined;
export declare function findMimeType(event: NostrEvent, u: string): string | null | undefined;
export declare function isImageUrl(u: string, event?: NostrEvent): boolean | "" | null | undefined;
export declare function isVideoUrl(u: string, event?: NostrEvent): boolean | "" | null | undefined;
export declare function isAudioUrl(u: string, event?: NostrEvent): boolean | "" | null | undefined;
export interface PromiseQueueCb {
    cb: (...args: any[]) => Promise<void>;
    args: any[];
}
export declare class PromiseQueue {
    queue: PromiseQueueCb[];
    constructor();
    appender(cb: (...cbArgs: any[]) => Promise<void>): (...apArgs: any[]) => void;
    execute(): Promise<void>;
}
export declare function parseRelayEvents(events: Set<NDKEvent>): Map<string, {
    writeRelays: string[];
    readRelays: string[];
}>;
export declare function prepareRelays(pubkeyRelays: Map<string, {
    writeRelays: string[];
    readRelays: string[];
}>, maxRelaysPerPubkey: number, addFallback?: boolean): {
    write: string[];
    read: string[];
};
export declare function fetchRelays(ndk: NDK, pubkeys: string[], maxRelaysPerPubkey?: number, addFallback?: boolean): Promise<{
    events: NDKEvent[];
    write: string[];
    read: string[];
}>;
export declare function fetchOutboxRelays(ndk: NDK, pubkeys: string[]): Promise<string[]>;
export declare function fetchInboxRelays(ndk: NDK, pubkeys: string[]): Promise<string[]>;
export declare function fetchEvents(ndk: NDK, filters: NDKFilter | NDKFilter[], relays: string[], timeoutMs?: number): Promise<Set<NDKEvent>>;
export declare function fetchEvent(ndk: NDK, filters: NDKFilter | NDKFilter[], relays: string[], timeoutMs?: number): Promise<NDKEvent | undefined>;
export declare function getRelativeUrlPrefix(o: StoreObject): "post/" | "tag/" | "author/";
export declare function getUrlMediaMime(u: string): "" | "image/png" | "image/gif" | "image/webp" | "image/svg+xml" | "image/jpeg" | "video/mp4" | "video/x-msvideo" | "video/mpeg" | "video/x-matroska" | "video/quicktime" | "video/webm" | "video/ogg" | "image/tiff" | "audio/mpeg" | "audio/aac" | "audio/ogg" | "audio/wav" | "audio/webm";
export declare function isEqualContentSettings(a: Site, b: Site): boolean;
export declare function ensureNumber(v: any | undefined): number | undefined;
export declare function normalizeRelayUrl(r: string): string | undefined;
export declare function hintsToRelays(relayHints: string[]): string[];
export declare function fetchBlossom(url: string): Promise<Response>;
export declare function fetchSiteFile(ndk: NDK, naddr: string, name: string, relays: string[]): Promise<NDKEvent | undefined>;