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Basic

Primitive Types​

number
string 
boolean
null
undefined
void
any
never
unknown

Object Types​

object
array
function
tuple
enum

Variable Types​

let myStr: string;
let myVal: string = "Hello!";

let myNum: number;
let myNum: number = 9;

let myBool: boolean;
let myBool: boolean = true;

Type inference​

let myStr = "test";
//typescript will know that it is of type string

let myNum = 888;
//typescript will know that it is of type number 

let myBool = false;
//typescript will know that it is of type boolean

Any​

//if you do no infer and do no define, by default, variable will be of type any
let mydata;

//typescript will not complain if you assign any text number of boolean to it
let myAny: any = "Hello";
myAny = 98;
myAny = true;