1_types.ts

// boolean (true / false)
let isOpen: boolean
isOpen: true

// string ('foo', "foo", `foo`)
let message: string
message: `foo ${isOpen}`

// number (int, float, hex, binary)
let total: number
total = 0xff0

// array (type[])
let items: string[] 
items = ["foo", "bar"]

let values: Array<number>
values = [1, 2, 3]

// tuple (array que sei as quantidades de intens e os tipos)
let title: [number, string]
title = [1, "foo"]

// enum
enum Colors {
  white = '#fff',
  black = '#000'
}

// any (qualquer coisa)
let coisa: any
coisa = [1] 

// void (vazio)
function logger(): void {
  console.log('foo')
}

// null/undefined
type Bla = string | undefined

// never
function error(): never {
  throw new Error('error');
}

// object ()
let cart: object
cart = {
  name: 'Chevrolet',
  color: 'red'
}

// Type Inference
let message2 = "mensagem definida"
message2 = 'string nova'

window.addEventListener('click', (e) => {
  console.log(e.button);
})