Woocommerce hide other shipments if free shipment

wc-hide-shipments-if-free.php

<?php
	if ( ! defined( 'WPINC' ) ) {
		die;
	}

	if ( !class_exists( 'HideShipmentsIfFree' ) ) {
		class HideShipmentsIfFree {

			function activate() {
				add_action( 'woocommerce_package_rates', array( $this, 'hide_shipments_if_free' ), 100 );
			}

			function hide_shipments_if_free( $rates ) {
				$free = array();
				foreach ( $rates as $rate_id => $rate ) {
					if ( 'free_shipping' === $rate->method_id ) {
						$free[ $rate_id ] = $rate;
						break;
					}
				}
				return ! empty( $free ) ? $free : $rates;
			}
		}

		$hide_shipments = new HideShipmentsIfFree();
		$hide_shipments->activate();
	}