"yarn build" html-webpack-plugin + @cypress/webpack-dev-server

$ ./node_modules/.bin/vue-cli-service build --mode prod --verbose
...
All browser targets in the browserslist configuration have supported ES module.
Therefore we don't build two separate bundles for differential loading.

✔  Building for prod...

ERROR  Error: Cannot find module 'html-webpack-plugin'
    Require stack:
    - <redacted>/node_modules/@vue/cli-service/lib/config/app.js
    - <redacted>/node_modules/@vue/cli-service/lib/Service.js
    - <redacted>/node_modules/@vue/cli-service/bin/vue-cli-service.js
...