text: // @flow
  
  import classnames from "classnames";
  
  classnames();
  classnames('a');
  classnames('a', 'b');
  classnames({a: true});
  classnames({a: true}, {b: true});
  classnames('a', {b: true});
  classnames({a: true}, 'b');
  classnames({a: null, b: undefined});
  classnames(undefined);
  classnames(null);
  
  // $ExpectError
  classnames(42);
  