import { Mapper_Properties, Mapper_Task_Interface } from "../../core/mapper";
export interface ImageDownloader_MappingType {
    image_target_folder: string;
    image_hugo_path: string;
    filename_property_name: string;
    simulate: boolean;
}
export declare class ImageDownloader_Mapping implements Mapper_Task_Interface {
    protected properties: ImageDownloader_MappingType;
    constructor(properties: ImageDownloader_MappingType);
    perform(mapping_properties: Mapper_Properties): string;
    private static is_valid_url_protocol;
    private static is_valid_url;
    private static download_image;
}