Get a Jupyter Notebook and JupyterLab compatible widget setup

Install packages

conda install -c conda-forge jupyterlab
conda install -c conda-forge ipywidgets
conda install -c conda-forge cookiecutter

jupyter labextension install @jupyter-widgets/jupyterlab-manager

Setup cookie cutter template

cookiecutter https://github.com/jupyter/widget-cookiecutter.git

  author_name []: Fritz Lekschas
  author_email []:
  github_project_name [jupyter-widget-example]: jlabwidget
  github_organization_name []: flekschas
  python_package_name [jlabwidget]:
  npm_package_name [jlabwidget]:
  npm_package_version [0.1.0]:
  project_short_description [A Custom Jupyter Widget Library]:

Build and install widget

cd ./jlabwidget
python setup.py build
pip install -e .

jupyter nbextension install --py --symlink --sys-prefix jlabwidget
jupyter nbextension enable --py --sys-prefix jlabwidget

jupyter labextension install js

Test the weidget

jupyter notebook

and

jupyter lab

run:

import jlabwidget
jlabwidget.example.HelloWorld()

you should see: Hello World!

Trouble Shooting

Yarn gets stuck trying to resolve a package [JupyterLab v0.32 (should be fixed in v0.33)]:

Install yarn globally: npm install -g yarn.js Symlink the global yarn cli into JupyterLab's staging dir:

mv /Users/<ADJUST>/anaconda3/lib/python3.6/site-packages/jupyterlab/staging/yarn.js /Users/<ADJUST>/anaconda3/lib/python3.6/site-packages/jupyterlab/staging/yarn.1.5.1.js
ln -s /usr/local/lib/node_modules/yarn/lib/cli.js /Users/<ADJUST>/anaconda3/lib/python3.6/site-packages/jupyterlab/staging/yarn.js

Extension file missing:

Make sure your package.json contains a property called jupyterlab that looks like so:
```
"jupyterlab": {
  "extension": "extension-jupyterlab.js"
}
```
And also make sure that this file is part of package.json's files property.