Make all product images in WooCommerce 3.3 square and cropped

functions.php

function woo_custom_single_image_size ( $size ) {
  $size['height'] = $size['width'];  
  $size['crop'] = 1;
  return $size;
}

add_filter('woocommerce_get_image_size_single', 'woo_custom_single_image_size', 50, 1);
add_filter('woocommerce_get_image_size_shop_single', 'woo_custom_single_image_size', 50, 1);
add_filter('woocommerce_get_image_size_thumbnail', 'woo_custom_single_image_size', 50, 1);
add_filter('woocommerce_get_image_size_gallery_thumbnail', 'woo_custom_single_image_size', 50, 1);