基本类型

基于 js 原始类型

/* boolean */
let boolean1: boolean = true
let boolean2: boolean = false

/* number */
let number1: number = 1
let number2: number = 5.3
let number3: number = -10

/* string */
let string1: string = 'hi'
let string2: string = 'hi'
let string3: string = `hi`

/* null */
let null1: null = null
/* undefined */
let undefined1: undefined = undefined

// bigint
let bigint1: bigint = 12n
let bigint2: bigint = BigInt(12)

/* Symbol */
let symbol1: Symbol = Symbol()