functions.php

<?php
add_filter(
  'page_template_hierarchy',
  function( $templates ) {
    $add = [];
    
    if ( is_cart() ) {
      $add[] = 'resources/views/layout/cart.php';
    }
    
    if ( is_checkout() ) {
      $add[] = 'resources/views/layout/checkout.php';
    }
    
    // Prepend any found templates.
    if ( ! empty( $add ) ) {
      $templates = array_merge( $add, $templates );
    }
    
    return $templates;
  }
);