install warn

[YvonneD]

When I install webpack with npm install -g generator-react-webpack npm install -g generator-react-webpack somthing is wrong

npm WARN deprecated formatio@1.2.0: This package is unmaintained. Use @sinonjs/formatio instead

spawn-sync@1.0.15 postinstall C:\Users\Yvonne\AppData\Roaming\npm\node_modules\generator-react-webpack\node_modules\spawn-sync
node postinstall

• generator-react-webpack@3.3.4
  added 345 packages from 592 contributors in 15.073s

What happend here.How can I fix it an install correctly.Thanks

[YvonneD]

I found substitude here https://github.com/sinonjs/formatio/ But seems like not mature. No ideas now