mochapack: [Bug] Not able to get --watch to work in examples/debug-webpack4 (or my own project)

• [ x ] I’d be willing to submit the fix (if I knew how to fix it…)

Describe the bug

I recently tried to switch over a code-base that was using mocha-webpack to use mochapack. I noticed --watch stopped working when I made the switch. In order to double check that the problem wasn’t our usage, I cloned the mochapack repo and ran the test loop…all tests passed (including the watch test)…

However, I then opened up the examples/debug-webpack4 folder and ran the test loop in watch mode. Making changes to the index.test.js file did not cause the test loop to re-run.

Now maybe the example just hasn’t been updated to account for some change, or maybe there is an actual bug - I’m not really sure.

To Reproduce

1. checkout master (git sha 7d0cbaff91b4f0b91b3e27afb342a92bea567df3 at time of filing)
2. Run cd examples/debug-webpack4 && npm i && npm run test:watch
3. Observe that test loop runs successfully and waits
4. Open up the file examples/debug-webpack4/src/__tests__/index.test.js and make a change to it
5. Observe that the test loop DOES NOT re-run.

Environment if relevant (please complete the following information):

• OS: OSX 10.14.16
• Node version: 11.9.0
• Mochapack version: git sha 7d0cbaff91b4f0b91b3e27afb342a92bea567df3 (master at time of filing