This repo was created in order to reproduce the issue reported in: webpack/webpack-dev-server#2781.
First run: yarn install
To see the expected behaviour run: yarn workspace webpack-4 run start (look at the value of WEBPACK_DEV_SERVER printed to the console).
To see the new actual behaviour run: yarn workspace webpack-5 run start (look at the value of WEBPACK_DEV_SERVER printed to the console).