react-scripts 3.3.0 doesn't work in development mode on IE or edge due to WebSocket constructor

Created by: WieserSoftware

When loaded into the browser, it throws a syntax error to the console on this line:

webpackHotDevClient line 60

// Connect to WebpackDevServer via a socket. var connection = new WebSocket(

I'm guessing this is because the constructor is not supported on edge or IE. Is there a polyfill to work around this?