npm install -g devkit on windows

[sous-studio]

npm install -g devkit on windows

`C:\Users\User1\AppData\Roaming\npm\devkit -> C:\Users\User1\AppData\Roaming\npm\node_modules\devkit\src\devkit.js

devkit@3.1.3 postinstall C:\Users\User1\AppData\Roaming\npm\node_modules\devkit
sh scripts/postinstall.sh

'sh' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! Windows_NT 10.0.14393
npm ERR! argv "C:\Program Files\nodejs\node.exe" "C:\Users\User1\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js" "install" "-g" "devkit"
npm ERR! node v7.4.0
npm ERR! npm v4.1.1
npm ERR! code ELIFECYCLE

npm ERR! devkit@3.1.3 postinstall: sh scripts/postinstall.sh
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the devkit@3.1.3 postinstall script 'sh scripts/postinstall.sh'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the devkit package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! sh scripts/postinstall.sh
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs devkit
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls devkit
npm ERR! There is likely additional logging output above.

C:>devkit
'sh' is not recognized as an internal or external command,
operable program or batch file.`

[pandanautinspace]

Probably late, but -
The Windows Install Instructions say to run all the commands from git bash. Seems like you were using normal command prompt.