import { type Operation } from "effection";
export interface Downloader extends Operation<void> {
    download(spec: string, context?: URL): Operation<void>;
}
export interface DownloaderOptions {
    host: URL;
    base: URL;
    outdir: string;
    strict?: boolean;
    concurrency?: number;
    retries?: number;
}
export type DownloadResult = {
    ok: true;
    bytes: number;
} | {
    ok: false;
    url: string;
    referrer: string;
    error: Error;
};
export declare const DownloadApi: import("@effectionx/context-api").Api<{
    download(downloader: Downloader, opts: DownloaderOptions, source: URL, referrer: URL): Operation<DownloadResult>;
}>;
export declare function useDownloader(opts: DownloaderOptions): Operation<Downloader>;
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