text: import isRelativeUrl from 'is-relative-url';
  
  isRelativeUrl('any-string');
  (isRelativeUrl('any-string'): boolean);
  
  // $FlowExpectedError
  isRelativeUrl(4);
  
  // $FlowExpectedError
  isRelativeUrl({});
  
  // $FlowExpectedError
  isRelativeUrl();
  
  // $FlowExpectedError
  isRelativeUrl(null);
  
  // $FlowExpectedError
  (isRelativeUrl('any-string'): number);
  