--- /dev/null
+{#
+/**
+ * @file
+ * Default theme implementation for displaying a tablesort indicator.
+ *
+ * Available variables:
+ * - style: Either 'asc' or 'desc', indicating the sorting direction.
+ *
+ * @ingroup themeable
+ */
+#}
+{%
+ set classes = [
+ 'tablesort',
+ 'tablesort--' ~ style,
+ ]
+%}
+<span{{ attributes.addClass(classes) }}>
+ <span class="visually-hidden">
+ {% if style == 'asc' -%}
+ {{ 'Sort ascending'|t }}
+ {% else -%}
+ {{ 'Sort descending'|t }}
+ {% endif %}
+ </span>
+</span>