import * as React from 'react';
import type { TranslationBundle } from '@jupyterlab/translation';
/**
 * The file extensions registered as the xtralab image diff provider.
 */
export declare const IMAGE_DIFF_EXTENSIONS: string[];
/**
 * The `data:` MIME subtype for a path xtralab renders as an image, or
 * `null` when the path is not a supported raster image.
 */
export declare function imageDataType(path: string): string | null;
interface IImageDiffViewProps {
    /**
     * Base64 of the reference (old) revision; empty when added.
     */
    reference: string;
    /**
     * Base64 of the challenger (new) revision; empty when deleted.
     */
    challenger: string;
    /**
     * MIME subtype from {@link imageDataType}.
     */
    fileType: string;
    /**
     * Translation bundle for user-facing strings.
     */
    trans: TranslationBundle;
}
/**
 * The image comparison surface: a segmented mode selector (reusing the
 * diff segmented-control styling so it matches the Notebook/JSON toggle)
 * plus the selected 2-up / swipe / onion-skin view.
 */
export declare function ImageDiffView(props: IImageDiffViewProps): React.ReactElement;
export {};