import type { LayoutBlockish } from '../LayoutBlockish';
import type { TextObject } from '../TextObject';
import type { ContextBlock } from './ContextBlock';
type Image = {
    url: string;
    dimensions?: {
        width: number;
        height: number;
    };
};
export type PreviewBlockBase = LayoutBlockish<{
    type: 'preview';
    title: TextObject[];
    description: TextObject[];
    footer?: ContextBlock;
}>;
export type PreviewBlockWithThumb = PreviewBlockBase & {
    thumb: Image;
};
export type PreviewBlockWithPreview = PreviewBlockBase & {
    preview: Image;
    externalUrl?: string;
    oembedUrl?: string;
    thumb: undefined;
};
export type PreviewBlock = PreviewBlockBase | PreviewBlockWithThumb | PreviewBlockWithPreview;
export declare const isPreviewBlockWithThumb: (previewBlock: PreviewBlock) => previewBlock is PreviewBlockWithThumb;
export declare const isPreviewBlockWithPreview: (previewBlock: PreviewBlock) => previewBlock is PreviewBlockWithPreview;
export {};
//# sourceMappingURL=PreviewBlock.d.ts.map