{#
/**
* @file
* Theme override to navigate books.
*
* Presented under nodes that are a part of book outlines.
*
* Available variables:
* - tree: The immediate children of the current node rendered as an unordered
* list.
* - current_depth: Depth of the current node within the book outline. Provided
* for context.
* - prev_url: URL to the previous node.
* - prev_title: Title of the previous node.
* - parent_url: URL to the parent node.
* - parent_title: Title of the parent node. Not printed by default. Provided
* as an option.
* - next_url: URL to the next node.
* - next_title: Title of the next node.
* - has_links: Flags TRUE whenever the previous, parent or next data has a
* value.
* - book_id: The book ID of the current outline being viewed. Same as the node
* ID containing the entire outline. Provided for context.
* - book_url: The book/node URL of the current outline being viewed. Provided
* as an option. Not used by default.
* - book_title: The book/node title of the current outline being viewed.
*
* @see template_preprocess_book_navigation()
*/
#}
{{ attach_library('classy/book-navigation') }}
{% if tree or has_links %}
{% endif %}