declare module 'pixelmatch' {
  function pixelmatch(
    img1: Buffer | Uint8Array,
    img2: Buffer | Uint8Array,
    output: Buffer | Uint8Array | null,
    width: number,
    height: number,
    options?: {
      threshold?: number;
      includeAA?: boolean;
      alpha?: number;
      aaColor?: [number, number, number];
      diffColor?: [number, number, number];
      diffColorAlt?: [number, number, number];
      diffMask?: boolean;
    }
  ): number;
  export = pixelmatch;
  export default pixelmatch;
}