import type IImageHelperRequest from './IImageHelperRequest';
/**
 * ImageHelper exposes the ability to convert a SharePoint url to an optimized thumbnail url.
 * @public
 */
export declare class ImageHelper {
    /**
     * Convert a url to a file or page on SharePoint into an optimized image url.
     *
     * @param request - IImageHelperRequest for the bundled parameters.
     *
     * @remarks
     * - If width and height are provided, then the resulting image will be scaled to the minimum of the width or height.
     * - The url will be most performant if only a width is provided. If a height is provided, the image will take longer to download due to the scaling.
     * - Only use this url at rendering time. It may contain an expiration token. Continue to use the original file's url for serialization.
     *
     * @returns A full url string for the image of the file. If no optimized url can be created (i.e. an external url or an unsupported file type),
     * the original sourceUrl is returned.
     *
     * @public
     */
    static convertToImageUrl(request: IImageHelperRequest): string;
}
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