export declare function gen(pkg: string, ver: string, { agent, signal, }?: {
    agent?: string | undefined;
    signal?: AbortSignal | undefined;
}): Promise<Response>;
export type Result = Readonly<{
    num: string;
    crate: string;
    checksum: string;
}>;
export declare function crate(pkg: string, ver: string): Promise<Result>;
export declare function crate_task(task: () => Promise<Response>): Promise<Result>;