React-native removed when use npm install

I don't understand why my npm make that and i'm new with react-native.

Here is the description of my "bug" on Windows 10 :

I can use react-native command for run android or create react-native app like that react-native init TestApp

When i go into my app folder with cd TestApp and i run react-native link or other react-native command everythings work fine.

But if i install a new package like fbsdk with npm like that npm install react-native-fbsdk --save i saw after installation this message :

added 1 package and removed 639 packages in 22.207s

And after that, if i would like use react-native command i have this message :

Command link unrecognized. Make sure that you have run npm install and that you are inside a react-native project.

For this message, i have entered react-native link command.

You know why npm remove all my packages ?

via Shinix