1. @DomName('WebGLRenderingContext.isRenderbuffer')
  2. @DocsEditable()
bool isRenderbuffer(Renderbuffer renderbuffer)

Source 

@DomName('WebGLRenderingContext.isRenderbuffer')
@DocsEditable()
bool isRenderbuffer(Renderbuffer renderbuffer) =>
    _blink.BlinkWebGLRenderingContext.instance
        .isRenderbuffer_Callback_1_(this, renderbuffer);