outputs. To access this extensibility, you should write a custom JupyterLab extension. If you would

like trigger some behavior in response to the user executing some code in a notebook, you can output a custom

mimetype (:ref:`rendermime`). We currently don't allow access to the JupyterLab

API from theJavsacript renderer, because this would tie the kernel and the notebook output to JupyterLab

API from theJavascript renderer, because this would tie the kernel and the notebook output to JupyterLab

and make it hard for other frontends to support it.

If you have comments or suggestions on changes here, please comment on `this issue<https://github.com/jupyterlab/jupyterlab/issues/4623>`__.