How to disable optimize warnings in webpack 2

reactjs warnings karma-runner webpack-2

Based on logs, there are two types of warnings

WARNING ... size limit - in order to fix it add to webpack.config option performance
```
performance: {  hints: false}
```
Recommended disable hints in development mode however enable in production mode
WARNING There are multiple modules with names that only differ in casing. - seems this warning related to Windows OS, there is issue on github where discussed this problem

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