/**
 * Horizontal half-cropping of rendered page images, used when a physical
 * spread page is rasterized but only one logical half is wanted (spread
 * screenshot generation).
 *
 * Node-only by design: rasterization consumers (cleanComposer screenshot
 * conversion, the screenshot operation) run in Node. The browser build never
 * reaches this code path because spread splitting targets server-side
 * publishing pipelines.
 */
export interface CroppedImageResult {
    width: number;
    height: number;
    /** Data URL (image/jpeg) of the cropped half. */
    base64: string;
}
/**
 * Crop the left or right half of a rendered page image.
 *
 * @param dataUrl Source image as a data URL (any image MIME node-canvas can decode)
 * @param half Which half of the image to keep
 * @returns The cropped half re-encoded as JPEG, with its dimensions
 * @throws When executed outside Node (no node-canvas available)
 */
export declare function cropImageHalf(dataUrl: string, half: 'left' | 'right'): Promise<CroppedImageResult>;
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