function formatFilename(filename) {
  // Strip away protocol and domain for compiled files
  const htmlMatch = /^https?:\/\/(.*)\/(.*)/.exec(filename);
  if (htmlMatch && htmlMatch[1] && htmlMatch[2]) {
    return htmlMatch[2];
  }

  // Strip everything before the first directory for source files
  const sourceMatch = /\/.*?([^./]+[/|\\].*)$/.exec(filename);
  if (sourceMatch && sourceMatch[1]) {
    return sourceMatch[1].replace(/\?$/, '');
  }

  // Unknown filename type, use it as is
  return filename;
}
Prettify a filename from error stacks into the desired format.
@param {string} filename The filename to be formatted.
@returns {string} The formatted filename.