Version 4.8.5 introduces a new console error on every file unit tested with jest

### Description

Whereas before, my unit test suite would pass without errors or warnings, simply by upgrading my version from 4.8.4 to 4.8.5, I get the following console error on every file:


### Expected behavior
No error as with version 4.8.4, since I haven't touched any files, other thank package.json.

### Actual behavior

### Environment

React Hot Loader version: 4.8.5

Run these commands in the project folder and fill in their results:

1. `node -v`: 11.1.0
2. `npm -v`: 6.9.0

Then, specify:

1. Operating system: Osx
2. Browser and version: Chrome, 74