functions.php

<?php

function boilerplate_load_assets()
{
  wp_enqueue_script('ourmainjs', get_theme_file_uri('/build/index.js'), array('wp-element'), '1.0', true);
  wp_enqueue_style('ourmaincss', get_theme_file_uri('/build/index.css'));
}

add_action('wp_enqueue_scripts', 'boilerplate_load_assets');
// Registro de Menus
register_nav_menus(
  array(
    'main_menu' => 'Main Menu',
    'footer_menu' => 'Footer Menu'

  )
);

function boilerplate_add_support()
{
  add_theme_support('title-tag');
  add_theme_support('post-thumbnails');
}

add_action('after_setup_theme', 'boilerplate_add_support');


/* ADICIONA CLASSES AOS MENUS */
function add_menu_link_class($atts, $item, $args)
{
  if (property_exists($args, 'link_class')) {
    $atts['class'] = $args->link_class;
  }
  return $atts;
}
add_filter('nav_menu_link_attributes', 'add_menu_link_class', 1, 3);

function add_menu_list_item_class($classes, $item, $args)
{
  if (property_exists($args, 'list_item_class')) {
    $classes[] = $args->list_item_class;
  }
  return $classes;
}
add_filter('nav_menu_css_class', 'add_menu_list_item_class', 1, 3);