export declare const is_array: (target: any) => boolean;
export declare const is_number: (target: any) => boolean;
export declare const is_string: (target: any) => boolean;
export declare const is_object: (target: any) => boolean;
export declare function get_img_src_or_url(str?: string): string;
export declare function get_image_natural_wh(url: string): Promise<{
    width: number;
    height: number;
}>;
export declare function network_url_replace_to_root_url(raw_url: string, has_line?: boolean): string;