WP - Rewrites

mask-theme-files.php

function mask_theme_files_urls() {
  $theme_name = next(explode('/themes/', get_stylesheet_directory()));
 
  global $wp_rewrite;
  $new_non_wp_rules = array(
    'css/(.*)'       => 'wp-content/themes/'. $theme_name . '/css/$1',
    'js/(.*)'        => 'wp-content/themes/'. $theme_name . '/js/$1',
    'images/wordpress-urls-rewrite/(.*)'    => 'wp-content/themes/'. $theme_name . '/images/wordpress-urls-rewrite/$1',
  );
  $wp_rewrite->non_wp_rules += $new_non_wp_rules;
}

add_action('generate_rewrite_rules', 'mask_theme_files_urls');