import { AbstractImage } from './AbstractImage.ts';
export declare class Picture extends AbstractImage<HTMLPictureElement> {
    static nativeName: string;
    constructor();
    private possibleImgExtension;
    static get observedAttributes(): string[];
    get loading(): string;
    set loading(value: string);
    get alt(): string;
    set alt(value: string);
    get src(): string;
    set src(value: string);
    get $imgEl(): HTMLImageElement;
    attributeChangedCallback(attrName: string, oldValue: string, newValue: string): void;
    removeSrc(): void;
    imgExists(imgUrl: string): Promise<boolean>;
    transformImgPath(imgName: string, imgExtension: string, breakpoint: string): Promise<string>;
    addImg(imgPath: string, alt: string, loading: string): void;
    addSrcset(imgPath: string, media: string): void;
    addSrc(value: string, alt: string, loading: string): Promise<void>;
    updateLoading(loading: string): void;
    updateAlt(alt: string): void;
}