/**
 * Resize an image to fit within maxWidth x maxHeight while preserving aspect ratio.
 */
export declare function resizeImage(dataUrl: string, maxWidth?: number, maxHeight?: number, quality?: number, format?: string): Promise<string>;
/**
 * Rotate an image by the given degrees (90, 180, 270).
 */
export declare function rotateImage(dataUrl: string, degrees: number, format?: string, quality?: number): Promise<string>;
/**
 * Flip an image horizontally or vertically.
 */
export declare function flipImage(dataUrl: string, direction: 'horizontal' | 'vertical', format?: string, quality?: number): Promise<string>;
/**
 * Crop an image to the specified rectangle.
 */
export declare function cropImage(dataUrl: string, x: number, y: number, width: number, height: number, format?: string, quality?: number): Promise<string>;
/**
 * Adjust brightness of an image (-100 to 100).
 */
export declare function adjustBrightness(dataUrl: string, amount: number, format?: string, quality?: number): Promise<string>;
/**
 * Adjust contrast of an image (-100 to 100).
 */
export declare function adjustContrast(dataUrl: string, amount: number, format?: string, quality?: number): Promise<string>;
/**
 * Convert a data URL to a Blob.
 */
export declare function dataUrlToBlob(dataUrl: string): Blob;
/**
 * Convert a File/Blob to a data URL.
 */
export declare function fileToDataUrl(file: File | Blob): Promise<string>;
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