declare namespace PIXI.extras {
    /**
     * @class
     * @extends PIXI.Shader
     * @memberof PIXI.extras
     * @param gl {PIXI.Shader} The WebGL shader manager this shader works for.
     * @param tilingMode {number} 0 for default, 1 for simple tiling, 2 for tiling
     */
    class OverlayShader extends PIXI.extras.PictureShader {
        constructor(gl: WebGLRenderingContext, tilingMode: number);
    }
}