Web assets (CSS/JS/Fonts)#

This theme includes several web assets to ease development and design. The configuration for our asset compilation is in webpack.config.js.

Compile and bundle assets#

When assets are compiled, static versions are placed in various places in the theme’s static folder:

src/pydata_sphinx_theme/theme/pydata_sphinx_theme/static

For many assets, a <hash> is generated and appended to the end of its reference in the HTML templates of the theme. This ensures the correct asset versions are served when viewers return to your site after upgrading the theme.

To compile the assets and bundle them with the theme, run this command:

$ nox -s compile

Styles (SCSS) and Scripts (JS)#

There are two relevant places for CSS/JS assets:

  • src/pydata_sphinx_theme/assets/styles has source files for SCSS assets. These will be compiled to CSS.

  • src/pydata_sphinx_theme/assets/scripts has source files for JS assets. These will be compiled to JS and import several vendored libraries (like Bootstrap).

  • src/pydata_sphinx_theme/theme/pydata_sphinx_theme/static has compiled versions of these assets (e.g. CSS files). This folder is not tracked in .git history, but it is bundled with the theme’s distribution.

Vendored scripts#

We vendor several packages in addition to our own CSS and JS. For example, Bootstrap, JQuery, and Popper. This is configured in the webpack.config.js file, and imported in the respective SCSS or JS file in our assets folder.

FontAwesome icons#

Three “styles” of the FontAwesome 6 Free icon font are used for icon links and admonitions, and is the only vendored font.

  • It is managed as a dependency in package.json

  • Copied directly into the site statics at compilation, including licenses

  • Partially preloaded to reduce flicker and artifacts of early icon renders

  • Configured in webpack.config.js

Jinja macros#

Our Webpack build generates a collection of Jinja macros in the static/webpack-macros.html file.

These macros are imported in the main layout.html file, and then inserted at various places in the page to link the static assets.

Some of the assets are “preloaded”, meaning that the browser begins requesting these resources before they’re actually needed. In particular, our JavaScript assets are preloaded in <head>, and the scripts are actually loaded at the end of <body>.