message: Fix Extract.pixels parameter as optional
diff: @@ -181,7 +181,7 @@ export class Extract implements IRendererPlugin
  * to convert. If left empty will use the main renderer
  * @return {Uint8Array} One-dimensional array containing the pixel data of the entire texture
  */
  - public pixels(target: DisplayObject|RenderTexture): Uint8Array
  + public pixels(target?: DisplayObject|RenderTexture): Uint8Array
  {
  const renderer = this.renderer;
  let resolution;
  