nomad/ui/app/utils/add-to-path.js

// Adds a string to the end of a URL path while being mindful of query params
export default function addToPath(url, extension = '') {
  const [path, params] = url.split('?');
  let newUrl = `${path}${extension}`;

  if (params) {
    newUrl += `?${params}`;
  }

  return newUrl;
}