export declare class DownloaderState {
    activeDownloads: (DownloadProgress | null)[];
    shouldStop: boolean;
    finishedScanning: boolean;
    currentSource: string | null;
    /**
     * Set the "shouldStop" flag on this state and all its relevant children.
     * Once set, all processing should respond and finish gracefully.
     *
     * This should only be called due to user intervention, in the case that they with to terminate an active run.
     */
    stop(): void;
}
export declare class DownloadProgress {
    /**
     * User-friendly description of whatever is happening right now.
     */
    status: string;
    /**
     * The name of the current Handler trying to download.
     */
    handler: string;
    knowsPercent: boolean;
    /**
     * Set internally as a signal to any supported running downloaders, that they should terminate.
     */
    shouldStop: boolean;
    /**
     * A float, representing the percentage complete this download is.
     */
    percent: number;
}