widget-ts-cookiecutter

A cookiecutter template for a custom Jupyter widget project.

What is widget-ts-cookiecutter?

With widget-ts-cookiecutter you can create a custom Jupyter interactive widget project with sensible defaults. widget-ts-cookiecutter helps custom widget authors get started with best practices for the packaging and distribution of a custom Jupyter interactive widget library.

Usage

Install cookiecutter:

pip install cookiecutter

After installing cookiecutter, use widget-ts-cookiecutter:

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

As widget-ts-cookiecutter runs, you will be asked for basic information about your custom Jupyter widget project. You will be prompted for the following information:

• author_name: your name or the name of your organization,
• author_email: your project's contact email,
• github_project_name: name of your custom Jupyter widget's GitHub repository,
• github_organization_name: name of your custom Jupyter widget's GitHub user or organization,
• python_package_name: name of the Python "back-end" package used in your custom widget.
• npm_package_name: name for the npm "front-end" package holding the JavaScript implementation used in your custom widget.
• npm_package_version: initial version of the npm package.
• project_short_description : a short description for your project that will be used for both the "back-end" and "front-end" packages.

After this, you will have a directory containing files used for creating a custom Jupyter widget. To check that eveything is set up as it should be, you should run the tests:

Create a dev environment:

conda create -n {{ cookiecutter.python_package_name }}-dev -c conda-forge nodejs yarn python jupyterlab
conda activate {{ cookiecutter.python_package_name }}-dev

Install the python. This will also build the TS package.

# First install the python package. This will also build the JS packages.
pip install -e ".[test, examples]"

# Run the python tests. This should not give you a few sucessful example tests
py.test

# Run the JS tests. This should again, only give TODO errors (Expected 'Value' to equal 'Expected value'):
yarn test

When developing your extensions, you need to manually enable your extensions with the notebook / lab frontend. For lab, this is done by the command:

jupyter labextension develop --overwrite .

For classic notebook, you can run:

jupyter nbextension install --sys-prefix --symlink --overwrite --py <your python package name>
jupyter nbextension enable --sys-prefix --py <your python package name>

Note that the --symlink flag doesn't work on Windows, so you will here have to run the install command every time that you rebuild your extension. For certain installations you might also need another flag instead of --sys-prefix, but we won't cover the meaning of those flags here.

Every time you make a change in the TypeScript code, you will need to rebuild it then refresh the browser page:

yarn run build

How to see your changes

Typescript:

If you use JupyterLab to develop then you can watch the source directory and run JupyterLab at the same time in different terminals to watch for changes in the extension's source and automatically rebuild the widget.

# Watch the source directory in one terminal, automatically rebuilding when needed
yarn run watch
# Run JupyterLab in another terminal
jupyter lab

After a change wait for the build to finish and then refresh your browser and the changes should take effect.

Python:

If you make a change to the python code then you will need to restart the notebook kernel to have it take effect.

Releasing your initial packages:

• Add tests
• Ensure tests pass locally and on CI. Check that the coverage is reasonable.
• Make a release commit, where you remove the , 'dev' entry in _version.py.
• Update the version in package.json
• Relase the npm packages:

  npm login
  npm publish

• Install publish dependencies:

pip install build twine

• Build the assets and publish

  python -m build .
  twine check dist/*
  twine upload dist/*

• Tag the release commit (git tag <python package version identifier>)
• Update the version in _version.py, and put it back to dev (e.g. 0.1.0 -> 0.2.0.dev). Update the versions of the npm packages (without publishing).
• Commit the changes.
• git push and git push --tags.