utils.js

function normalizePath(path, stripTrailing) {
  if (path === '\\' || path === '/') {
    return '/';
  }

  const len = path.length;

  if (len <= 1) {
    return path;
  }

  // ensure that win32 namespaces has two leading slashes, so that the path is
  // handled properly by the win32 version of path.parse() after being normalized
  // https://msdn.microsoft.com/library/windows/desktop/aa365247(v=vs.85).aspx#namespaces
  let prefix = '';

  if (len > 4 && path[3] === '\\') {
    // eslint-disable-next-line prefer-destructuring
    const ch = path[2];

    if ((ch === '?' || ch === '.') && path.slice(0, 2) === '\\\\') {
      // eslint-disable-next-line no-param-reassign
      path = path.slice(2);
      prefix = '//';
    }
  }

  const segs = path.split(/[/\\]+/);

  if (stripTrailing !== false && segs[segs.length - 1] === '') {
    segs.pop();
  }

  return prefix + segs.join('/');
}

// eslint-disable-next-line import/prefer-default-export
export { normalizePath };