import { Buffer } from 'node:buffer';
import { ChunkStream } from './chunkstream';
declare interface BitmapInfo {
  width: number
  height: number
  interlace: boolean
  bpp: number
  depth: 1 | 2 | 4 | 8 | 16
}
/**
 * Interface for FilterAsync events
 */
declare interface FilterAsyncEvents {
  complete: (data: Buffer) => void
  error: (error: Error) => void
}
/**
 * Asynchronous filter processor for PNG data
 * Extends ChunkStream to handle streaming data processing
 */
export declare class FilterAsync extends ChunkStream {
  constructor(bitmapInfo: BitmapInfo);
  emit<K extends keyof FilterAsyncEvents>(event: K, ...args: Parameters<FilterAsyncEvents[K]>): boolean;
  on<K extends keyof FilterAsyncEvents>(event: K, listener: FilterAsyncEvents[K]): this;
  once<K extends keyof FilterAsyncEvents>(event: K, listener: FilterAsyncEvents[K]): this;
}
// Default export for backward compatibility
export default FilterAsync;