I am building a GatsbyJS site which is essentially a React site that builds out to static files.    In my build process, I am getting an error in my ThrowPropsPlugin.js   The specific error is: WebpackError: TypeError: Cannot read property 'defaultView' of undefined   Here's a screenshot of the part of code...     In the actual file... this code is under the    VelocityTracker section.   I'm guessing this error is happening b