how to setup a headless environment for nightwatch.js

nightwatch_headless.js

// The environment below is named 'headless' and is located in our nightwatch.conf.js file.
"headless": {
      "desiredCapabilities": {
        "chromeOptions": {
          "args": [
                "headless", // This is the line that tells nightwatch to run in a headless mode
          ],
            },
            "browserName": "chrome",
        "javascriptEnabled": true 
  }
}