Test that the TypeScript is installed correctly by typing tsc -v in to your terminal or command prompt. You should see the TypeScript version print out to the screen. For help on possible arguments you can type tsc -h or just tsc .

How do I find the TypeScript version?

Go to: C:\Program Files (x86)\Microsoft SDKs\TypeScript, there you see directories of type 0.9, 1.0 1.1. Enter the high number that you have (in this case 1.1) Copy the directory and run in CMD the command tsc -v, you get the version.

How do I update TypeScript to latest version?

Try npm install -g typescript@latest . You can also use npm update instead of install, without the latest modifier. This will install the latest typescript version if not already installed, otherwise it will update the current installation to the latest version.