import stream from 'stream';

/**
 * Base image encoder class. An ImageEncoder receives a 8-bit grayscale
 * image from Buffer and writes common image file data (e.g., PNG)
 * into a given stream.
 */
export default abstract class ImageEncoder {
  protected config: any = null;

  constructor(config?: any) {
    this.config = config || null;
  }

  public mimeType(): string {
    return 'image/png';
  }

  public abstract write(
    image: Buffer,
    width: number,
    height: number
  ): Promise<stream.Readable>;
}