Helper function to determine if the Order CSV Export uses a one row per item format (even custom formats)

sv-wc-csv-export-one-row-per-item-check.php

<?php

/**
 * Helper function to check the export format
 *
 * @param \WC_Customer_Order_CSV_Export_Generator $csv_generator the generator instance
 * @return bool - true if this is a one row per item format
 */
function sv_wc_csv_export_is_one_row( $csv_generator ) {
	
	$one_row_per_item = false;
	
	if ( version_compare( wc_customer_order_csv_export()->get_version(), '4.0.0', '<' ) ) {
		// pre 4.0 compatibility
		$one_row_per_item = ( 'default_one_row_per_item' === $csv_generator->order_format || 'legacy_one_row_per_item' === $csv_generator->order_format );
	} elseif ( isset( $csv_generator->format_definition ) ) {
		// post 4.0 (4.0.3+)
		$one_row_per_item = 'item' === $csv_generator->format_definition['row_type'];
	}
	
	return $one_row_per_item;
}