How i can to customize testRunner from testcafe framework?

I have my testRunner for tests.
But the problem is -> how i can add the browser resolution in test 

runner, because i don't want to add this to my tests. Thanks for help.

      runner
        .src(testFiles)
        .browsers('chrome')
        .reporter('html', stream)
        .run()
        .then(failedCount => {
          console.log(failedCount);
          testcafe.close();