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function make_before_block_visitor( $hooked_blocks, $context ) {
	/**
	 * Injects hooked blocks before the given block, injects the `theme` attribute into Template Part blocks, and returns the serialized markup.
	 *
	 * If the current block is a Template Part block, inject the `theme` attribute.
	 * Furthermore, prepend the markup for any blocks hooked `before` the given block and as its parent's
	 * `first_child`, respectively, to the serialized markup for the given block.
	 *
	 * @param array $block        The block to inject the theme attribute into, and hooked blocks before. Passed by reference.
	 * @param array $parent_block The parent block of the given block. Passed by reference. Default null.
	 * @param array $prev         The previous sibling block of the given block. Default null.
	 * @return string The serialized markup for the given block, with the markup for any hooked blocks prepended to it.
	 */
	return function ( &$block, &$parent_block = null, $prev = null ) use ( $hooked_blocks, $context ) {
		_inject_theme_attribute_in_template_part_block( $block );

		$markup = '';

		if ( $parent_block && ! $prev ) {
			// Candidate for first-child insertion.
			$relative_position  = 'first_child';
			$anchor_block_type  = $parent_block['blockName'];
			$hooked_block_types = isset( $hooked_blocks[ $anchor_block_type ][ $relative_position ] )
				? $hooked_blocks[ $anchor_block_type ][ $relative_position ]
				: array();

			/**
			 * Filters the list of hooked block types for a given anchor block type and relative position.
			 *
			 * @since 6.4.0
			 *
			 * @param string[]                $hooked_block_types  The list of hooked block types.
			 * @param string                  $relative_position   The relative position of the hooked blocks.
			 *                                                     Can be one of 'before', 'after', 'first_child', or 'last_child'.
			 * @param string                  $anchor_block_type   The anchor block type.
			 * @param WP_Block_Template|array $context             The block template, template part, or pattern that the anchor block belongs to.
			 */
			$hooked_block_types = apply_filters( 'hooked_block_types', $hooked_block_types, $relative_position, $anchor_block_type, $context );
			foreach ( $hooked_block_types as $hooked_block_type ) {
				$markup .= get_comment_delimited_block_content( $hooked_block_type, array(), '' );
			}
		}

		$relative_position  = 'before';
		$anchor_block_type  = $block['blockName'];
		$hooked_block_types = isset( $hooked_blocks[ $anchor_block_type ][ $relative_position ] )
			? $hooked_blocks[ $anchor_block_type ][ $relative_position ]
			: array();

		/** This filter is documented in wp-includes/blocks.php */
		$hooked_block_types = apply_filters( 'hooked_block_types', $hooked_block_types, $relative_position, $anchor_block_type, $context );
		foreach ( $hooked_block_types as $hooked_block_type ) {
			$markup .= get_comment_delimited_block_content( $hooked_block_type, array(), '' );
		}

		return $markup;
	};
}