stats.warningsFilter is not respected

[LazarusX]

I am using stats.warningsFilter to suppress known warnings, and would like to use this plugin to fail on future unknown warnings. However, it looks like stats.warningsFilter is not respected by this plugin. Known warnings don't show up in console any more but webpack still exit with return code 1.

[AustinMatherne]

Hi @LazarusX. I'm not actively using this plugin. PRs are welcome though!