function _assertAndSanitizeOptions(options) {

  options.tmpdir = _getTmpDir(options);

  const tmpDir = options.tmpdir;

  /* istanbul ignore else */
  if (!_isUndefined(options.name))
    _assertIsRelative(options.name, 'name', tmpDir);
  /* istanbul ignore else */
  if (!_isUndefined(options.dir))
    _assertIsRelative(options.dir, 'dir', tmpDir);
  /* istanbul ignore else */
  if (!_isUndefined(options.template)) {
    _assertIsRelative(options.template, 'template', tmpDir);
    if (!options.template.match(TEMPLATE_PATTERN))
      throw new Error(`Invalid template, found "${options.template}".`);
  }
  /* istanbul ignore else */
  if (!_isUndefined(options.tries) && isNaN(options.tries) || options.tries < 0)
    throw new Error(`Invalid tries, found "${options.tries}".`);

  // if a name was specified we will try once
  options.tries = _isUndefined(options.name) ? options.tries || DEFAULT_TRIES : 1;
  options.keep = !!options.keep;
  options.detachDescriptor = !!options.detachDescriptor;
  options.discardDescriptor = !!options.discardDescriptor;
  options.unsafeCleanup = !!options.unsafeCleanup;

  // sanitize dir, also keep (multiple) blanks if the user, purportedly sane, requests us to
  options.dir = _isUndefined(options.dir) ? '' : path.relative(tmpDir, _resolvePath(options.dir, tmpDir));
  options.template = _isUndefined(options.template) ? undefined : path.relative(tmpDir, _resolvePath(options.template, tmpDir));
  // sanitize further if template is relative to options.dir
  options.template = _isBlank(options.template) ? undefined : path.relative(options.dir, options.template);

  // for completeness' sake only, also keep (multiple) blanks if the user, purportedly sane, requests us to
  options.name = _isUndefined(options.name) ? undefined : options.name;
  options.prefix = _isUndefined(options.prefix) ? '' : options.prefix;
  options.postfix = _isUndefined(options.postfix) ? '' : options.postfix;
}
Asserts whether the specified options are valid, also sanitizes options and provides sane defaults for missing
options.

@param {Options} options
@private