gistfile1.txt

const sku = 'swg_stepped_pricing_test';

const getWindowSwg = (context = window) => {
  // eslint-disable-next-line compat/compat
  return new Promise((resolve, _reject) => {
    // SWG (global): represents an array of handlers that are called back
    // with a reference to the Subscriptions API once the library is loaded.
    // eslint-disable-next-line no-param-reassign
    (context.SWG = context.SWG || []).push((swg) => resolve(swg));
  });
};

getWindowSwg().then((swgClient) => {
      swgClient.subscribe(sku);
    });