Introduction¶

What is TypeScript?¶

It is a superset of JavaScript programming language that has the concept of static typing to the core feature of JavaScript. This is a big deal because JavaScript is and always has been a dynamic language. TypeScript does not run directly on the browser as JavaScript run, we have to compile the TypeScript file to the JavaScript then it will work as usual.

Dynamic vs. Static¶

DYNAMIC	STATIC
Types	Types
Duck Typing	Static Typing
Forgiving	Rigid
Great for web browser object modal	Promotes stability and maintainability

Example¶

Duck Typing¶

{
   name: "duck",
   quack: function() {}

   function sayQuack(target)
   {
      target.quack();
   }
}

Static Typing¶

class Duck
{
   public string name;
   public void quack(){}
}

Linux Installation¶

Install Node.js

If you install Node.js, NPM will be automatically installed.

Install the latest version

dev@dev:~$ sudo apt update
dev@dev:~$ sudo apt install nodejs
dev@dev:~$ node -v
v10.19.0

Install specific version

dev@dev:~$ sudo apt update
dev@dev:~$ curl -fsSL https://deb.nodesource.com/setup_16.x | sudo -E bash -
dev@dev:~$ sudo apt-get install -y nodejs
v10.19.0

Remove Node.js and NPM

dev@dev:~$ sudo npm cache clean -f
dev@dev:~$ sudo apt-get remove nodejs
dev@dev:~$ sudo apt-get remove npm

Go to /etc/apt/sources.list.d and remove any node list if you have. Then do an update

dev@dev:~$ sudo apt-get update

Check for any .npm or .node folder in your home folder and delete those. This will give you the location

dev@dev:~$ which node
/usr/bin/node

Install NPM

dev@dev:~$ sudo apt install npm

Install TypeScript

dev@dev:~$ sudo npm install -g typescript
dev@dev:~$ tsc
Version 4.6.3
tsc: The TypeScript Compiler - Version 4.6.3