VisualRegressionPlugin usage along with Saucelab configuration

[suv12345]

VisualRegressionPlugin is able to take screenshots in local setup .
But when we use it with Saucelab configuration ,tests are not running with webtestrunner.
Please propose appropriate resolution for this problem

[suv12345]

it can work with some changes in screenshot let screenshot = await browser.takeScreenshot();