I looks like the orderWarnings flag added in #108 was removed somewhere between 3.1.3 and 4.0.2.
I'm seeings lots of
WARNING in chunk <chunkName> [extract-css-chunks-webpack-plugin]
Conflicting order between:
* css <modulePath>
* css <modulePath>
webpack/mini-css-extract-plugin#250 (comment)
Was this a deliberate choice?