A few tips in order

• restart the terminal
• restart the machine
• reinstall nodejs + then run npm install typescript -g

If it still doesn't work run npm config get prefix to see where npm install -g is putting files (append bin to the output) and make sure that they are in the path (the node js setup does this. Maybe you forgot to tick that option).

Official Installation

The official TypeScript download page lists three ways for the installation, via:

• a npm module
• a NuGet package
• a Visual Studio extension

They present the following install command: npm install typescript --save-dev

Difference

As one of the official ways covers the TypeScript npm module (which can be found here), you can be sure that it provides the latest release, published by the TypeScript team itself.

For a specific Linux distro, the executables are provided, maintained, and published by the team responsible for that distro's package manager. So you may end up with an outdated version of TypeScript .

For example, with Ubuntu you can find all the TypeScript apt packages here.

I had the same problem below procedure worked for me

Update NPM

npm install npm@latest -g

Update typescript

npm -g upgrade typescript

or

npm install typescript@latest -g

now you should see

tsc --version

Version 2.1.5