/**
 * utility functions to determine whether file type supports preview.
 * and return the preview image url based on the file url
 */
/**
 * @internal
 */
export declare class PreviewHelper {
    static readonly RESOLUTION: string;
    static readonly GUID_SITE: string;
    static readonly GUID_WEB: string;
    static readonly GUID_FILE: string;
    static readonly PATH: string;
    static readonly EXT: string;
    static readonly ORIGINAL_WIDTH: string;
    static readonly ORIGINAL_HEIGHT: string;
    static readonly WIDTH: string;
    static readonly WIDTH_SHORT: string;
    static readonly HEIGHT_SHORT: string;
    static readonly VIEWPORT_LEFT: string;
    static readonly VIEWPORT_TOP: string;
    static readonly VIEWPORT_WIDTH: string;
    static readonly VIEWPORT_HEIGHT: string;
    static readonly CALLER_STACK: string;
    static readonly INPUT_FORMAT: string;
    static readonly DOCID: string;
    static readonly PREVIEW_HANDLER_PATH: string;
    static readonly VIDEO_EXTENSIONS: ReadonlyArray<string>;
    static readonly IMAGE_EXTENSIONS: ReadonlyArray<string>;
    /**
     * Returns true if the filetype is supported for preview.
     */
    static hasThumbnailOrFileTypeSupportsPreview(fileType: string | undefined, thumbnail: string | undefined): boolean;
    /**
     * Returns preview image URL for supported file extensions using getPreview.aspx service
     * Must be given unencoded strings
     */
    static getPreviewImageUrl(fileType: string | undefined, thumbnail: string | undefined, baseUrl: string, path: string | undefined, siteId: string | undefined, webId: string | undefined, uniqueId: string | undefined, width?: number, isBannerImageUrl?: boolean, callerId?: string, originalWidth?: number, originalHeight?: number): string;
    private static _generateGetPreviewImageUrl;
}
//# sourceMappingURL=PreviewHelper.d.ts.map