import { Buffer } from 'node:buffer';
/**
 * Packs pixel data using PNG filtering
 * @param pxData - Input pixel data
 * @param width - Image width
 * @param height - Image height
 * @param options - Filtering options
 * @param bpp - Bytes per pixel
 * @returns Filtered data buffer
 */
export declare function packFilter(pxData: Buffer, width: number, height: number, options: FilterPackOptions, bpp: number): Buffer;
/**
 * Options for PNG filter packing
 */
declare interface FilterPackOptions {
  filterType?: number | number[]
  bitDepth?: number
}
declare type FilterFunction = (
  pxData: Buffer,
  pxPos: number,
  byteWidth: number,
  rawData: Buffer,
  rawPos: number,
  bpp: number
) => void;
declare type FilterSumFunction = (
  pxData: Buffer,
  pxPos: number,
  byteWidth: number,
  bpp: number
) => number;
// Default export for backward compatibility
export default packFilter;