code: function getFilepathFromUrl (u) {
  	const nu = normalizeUrl(u, {removeTrailingSlash: true});
  	return getPathnameFromUrl(nu).substring(1);
  }
docs: Returns relative path from given url
  Example: http://example.com/some/path/file.js => some/path/file.js
  @param {string} u - url
  @returns {string} path