def update_all(app, env):
    """During development, if CSS/JS has changed, all files should be re-written,
    to load the correct resources.
    """
    if (
        app.config.html_theme_options.get("theme_dev_mode", False)
        and env.book_theme_resources_changed
    ):
        return list(env.all_docs.keys())
During development, if CSS/JS has changed, all files should be re-written,
    to load the correct resources.
    
docs/source/_theme/__init__.py