//For Windows users
//Error - npm : The term 'npm' is not recognized as the name of a cmdlet
1 - Open Controll Panel -> User Accounts -> Change my environment variables (on the left menu)
2 - On the first section "User variables for ..." select the row "Path" and then click "Edit"
3 - Add a new system variable by clicking on "New", intoduce the following value at the row "C:\Program Files\nodejs"
4 - Then Ok -> Ok, and you are ready!
Tip: Close your command line and open a new one before trying to run npm.

Just add:
;C:\Program Files\nodejs\
To the end of your Path variable on the "User variable" section of the Environment Variables on the System Properties.
After that, reopen your command prompt and type
npm
This should work.

Restart your vscode.
If the problem still persists like me: Restarting your computer should fix it.

First Install Node.js
After you can access this command