Pre-alpha version.
(not yet published on npm)
If you want to install & give it a try, clone the repo first & then use the commands below from the cloned directory.

• JupyterLab

For a development install (requires npm version 4 or later), do the following in the repository directory:

npm install
jupyter labextension link .

To rebuild the package and the JupyterLab app:

npm run build
jupyter lab build

Installation and activation for jupyterlab_git python handler package (requires anaconda:python version >=3.6.0):

pip install .
jupyter serverextension enable --py jupyterlab_git

Launch JupyterLab & you will see the new Git buttons on the left side of the window.