webpack-dev-server reloading issue

The repository is created to demonstrate a potential bug in the latest version of webpack-dev-server (v3.4.1 at the time of writing). This version ignores changes in node_modules, and does not trigger a new compilation. Whereas, when the webpack-dev-server dependency is pinned to 3.3.1, it works.

Steps to reproduce

1. Clone this repo.
2. Do npm i in the main folder. Main has a dependency on the service package, included in main via a direct tarball dependency to service/service-1.0.0.tgz.
3. Do npm start in main. This should start the webpack-dev-server.
4. Go to main/node_modules/service/index.js, and make some change.
5. The webpack-dev-server does not trigger a build.

You may stop the process, pin the webpack-dev-server to 3.3.1, and repeat the the process to verify that the earlier version worked.

Link to the issue: webpack/webpack-dev-server#1934