Is there a way to execute commands in Typescript, just like we do in Javascript with Shelljs Library?
You can use any javascript library in typescript, so shelljs should work too.
Typescript is a so called superset of javascript, which means it adds functionality to the javascript language. Therefore: all valid javascript is valid typescript (but not the other way around).
Install shelljs:
npm install --save shelljs
For extra convenience, you can add the @types for shelljs:
npm install --save @types/shelljs
Maybe you should take a look at Angular Universal, which runs server-side.