How to use the intern.default.config function in intern

"use strict";
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const intern = require("intern").default;
const { assert } = intern.getPlugin("chai");
const { registerSuite } = intern.getInterface("object");
const FunctionalHelpers = require("./lib/helpers.js");
const path = require("path");

var cwd = intern.config.basePath;
var VALID_IMAGE_PATH = path.join(cwd, "tests/fixtures", "green_square.png");
// DETAILS_STRING is a URL encoded object, stringified to JSON.
var DETAILS_STRING =
  '{"gfx.webrender.all"%3Afalse%2C"gfx.webrender.blob-images"%3A2%2C"gfx.webrender.enabled"%3Afalse%2C"image.mem.shared"%3A2%2C"layout.css.servo.enabled"%3Atrue}';

var url = function(path) {
  return intern.config.siteRoot + path;
};

registerSuite("Reporting (non-auth)", {
  tests: {
    "Submit buttons are disabled"() {
      return FunctionalHelpers.openPage(
        this,
        url("/issues/new"),
        ".js-report-buttons"

var url = function(path) {
  return intern.config.siteRoot + path;
};

var url = function(path) {
  return intern.config.siteRoot + path;
};

var url = function(path, params) {
  var fullUrl =
    params !== undefined
      ? intern.config.siteRoot + path + params
      : intern.config.siteRoot + path;
  return fullUrl;
};

var url = function(path) {
  return intern.config.siteRoot + path;
};

var url = function(path) {
  return intern.config.siteRoot + path;
};

var url = function(path) {
  return intern.config.siteRoot + path;
};

var url = function(path) {
  return intern.config.siteRoot + path;
};

var url = function(path) {
  return intern.config.siteRoot + path;
};

var url = function(path) {
  return intern.config.siteRoot + path;
};