import { ExternalAttachment, ExternalAttachmentFactoryOptions } from './external';
import { PhotoAttachment, IPhotoAttachmentPayload } from './photo';
import { AttachmentType, kSerializeData } from '../../utils/constants';
declare const kPhoto: unique symbol;
export interface ILinkAttachmentPayload {
    title: string;
    caption?: string;
    description?: string;
    url: string;
    product?: {
        price: object;
    };
    button?: {
        title: string;
        action: {
            type: string;
            url: string;
        };
    };
    photo?: IPhotoAttachmentPayload;
}
export type LinkAttachmentOptions = ExternalAttachmentFactoryOptions<ILinkAttachmentPayload>;
export declare class LinkAttachment extends ExternalAttachment<ILinkAttachmentPayload, AttachmentType.LINK | 'link'> {
    protected [kPhoto]: PhotoAttachment | undefined;
    /**
     * Constructor
     */
    constructor(options: LinkAttachmentOptions);
    /**
     * Checks for the presence of a photo in a link
     */
    get hasPhoto(): boolean;
    /**
     * Returns the title
     */
    get title(): string;
    /**
     * Returns the title
     */
    get caption(): string | undefined;
    /**
     * Returns the description
     */
    get description(): string | undefined;
    /**
     * Returns the URL of the link
     */
    get url(): string;
    /**
     * Returns the product
     */
    get product(): ILinkAttachmentPayload['product'] | undefined;
    /**
     * Returns the button
     */
    get button(): ILinkAttachmentPayload['button'] | undefined;
    /**
     * Returns the photo
     */
    get photo(): PhotoAttachment | undefined;
    /**
     * Returns the custom data
     */
    [kSerializeData](): object;
}
export {};