Webdriverio: How can I force the incognito mode in chrome, or private mode in firefox?

[s7dhansh]

I am not sure where to give the options. Any help would be great.

[s7dhansh]

Found it:

var options = {
    desiredCapabilities: {
        browserName: "chrome",
        chromeOptions: {
            args: ["incognito"]
        }
    }
};