import { Hostname, Link } from "./url-frontier";
export declare class HostnameHeap {
    #private;
    timeBetweenHostnameFetches: number;
    sleepTime: number;
    insertURL(url: Link, time?: number): void;
    insertHostname(hostname: Hostname, time?: number): void;
    deleteHostname(hostname: Hostname): void;
    has(url: Hostname): boolean;
    next(): Promise<string>;
    return(): Promise<{
        value: undefined;
        done: boolean;
    }>;
    throw(): Promise<{
        value: undefined;
        done: boolean;
    }>;
    [Symbol.asyncIterator](): this;
}
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