Remove building wp_template_parts variation call for frontend

src/wp-admin/includes/post.php

@@ -2317,6 +2317,11 @@ function get_block_editor_server_block_settings() {
 
 			$blocks[ $block_name ][ $key ] = $block_type->{ $field };
 		}
+
+		// If the block has a variations callback, call it and add the variations to the block.
+		if ( is_callable( $block_type->variations ) ) {
+			$blocks[ $block_name ]['variations'] = call_user_func( $block_type->variations );
+		}
 	}
 
 	return $blocks;

src/wp-includes/blocks/navigation-link.php

@@ -323,12 +323,11 @@ function build_variation_for_navigation_link( $entity, $kind ) {
 }
 
 /**
- * Register the navigation link block.
+ * Returns an array of variations for the navigation link block.
  *
- * @uses render_block_core_navigation()
- * @throws WP_Error An WP_Error exception parsing the block definition.
+ * @return array
  */
-function register_block_core_navigation_link() {
+function build_navigation_link_block_variations() {
 	$post_types = get_post_types( array( 'show_in_nav_menus' => true ), 'objects' );
 	$taxonomies = get_taxonomies( array( 'show_in_nav_menus' => true ), 'objects' );
 
@@ -359,12 +358,21 @@ function register_block_core_navigation_link() {
 			}
 		}
 	}
+	return array_merge( $built_ins, $variations );
+}
 
+/**
+ * Register the navigation link block.
+ *
+ * @uses render_block_core_navigation()
+ * @throws WP_Error An WP_Error exception parsing the block definition.
+ */
+function register_block_core_navigation_link() {
 	register_block_type_from_metadata(
 		__DIR__ . '/navigation-link',
 		array(
 			'render_callback' => 'render_block_core_navigation_link',
-			'variations'      => array_merge( $built_ins, $variations ),
+			'variations'      => 'build_navigation_link_block_variations',
 		)
 	);
 }

src/wp-includes/blocks/post-terms.php

@@ -59,9 +59,11 @@ function render_block_core_post_terms( $attributes, $content, $block ) {
 }
 
 /**
- * Registers the `core/post-terms` block on the server.
+ * Returns the available variations for the `core/post-terms` block.
+ *
+ * @return array The available variations for the block.
  */
-function register_block_core_post_terms() {
+function build_post_term_block_variations() {
 	$taxonomies = get_taxonomies(
 		array(
 			'publicly_queryable' => true,
@@ -102,12 +104,18 @@ function register_block_core_post_terms() {
 			$custom_variations[] = $variation;
 		}
 	}
+	return array_merge( $built_ins, $custom_variations );
+}
 
+/**
+ * Registers the `core/post-terms` block on the server.
+ */
+function register_block_core_post_terms() {
 	register_block_type_from_metadata(
 		__DIR__ . '/post-terms',
 		array(
 			'render_callback' => 'render_block_core_post_terms',
-			'variations'      => array_merge( $built_ins, $custom_variations ),
+			'variations'      => 'build_post_term_block_variations',
 		)
 	);
 }

src/wp-includes/blocks/template-part.php

@@ -276,7 +276,7 @@ function register_block_core_template_part() {
 		__DIR__ . '/template-part',
 		array(
 			'render_callback' => 'render_block_core_template_part',
-			'variations'      => build_template_part_block_variations(),
+			'variations'      => 'build_template_part_block_variations',
 		)
 	);
 }

src/wp-includes/class-wp-block-type.php

@@ -113,7 +113,8 @@ class WP_Block_Type {
 	 * Block variations.
 	 *
 	 * @since 5.8.0
-	 * @var array[]
+	 * @since 6.5.0 Added callback support.
+	 * @var callable|array[]
 	 */
 	public $variations = array();
 

src/wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php

@@ -292,7 +292,6 @@ public function prepare_item_for_response( $item, $request ) {
 				'view_script_handles',
 				'editor_style_handles',
 				'style_handles',
-				'variations',
 				'block_hooks',
 			),
 			$deprecated_fields
@@ -314,6 +313,14 @@ public function prepare_item_for_response( $item, $request ) {
 			}
 		}
 
+		if ( rest_is_field_included( 'variations', $fields ) ) {
+			$field = $block_type->variations;
+			if ( is_callable( $block_type->variations ) ) {
+				$field = call_user_func( $block_type->variations );
+			}
+			$data['variations'] = rest_sanitize_value_from_schema( $field, $schema['properties']['variations'] );
+		}
+
 		if ( rest_is_field_included( 'styles', $fields ) ) {
 			$styles         = $this->style_registry->get_registered_styles_for_block( $block_type->name );
 			$styles         = array_values( $styles );