import { Block } from '../../protocols/blocks';
import { ImageCover } from '../../protocols/page-props';
export declare class PageBlockToCoverImageSource {
    private readonly _pageBlock;
    constructor(pageBlock: Block);
    toImageCover(): Promise<ImageCover | null>;
    private _isImageURL;
    private getImageAuthenticatedSrc;
    private _pageCoverPositionToPositionCenter;
}