code: function LGraphTextureChannels() {
              this.addInput("Texture", "Texture");
  
              this.addOutput("R", "Texture");
              this.addOutput("G", "Texture");
              this.addOutput("B", "Texture");
              this.addOutput("A", "Texture");
  
              this.properties = { use_luminance: true };
              if (!LGraphTextureChannels._shader) {
                  LGraphTextureChannels._shader = new GL.Shader(
                      Shader.SCREEN_VERTEX_SHADER,
                      LGraphTextureChannels.pixel_shader
                  );
              }
          }
docs: Texture Channels *****************************************