Create variable in Typescript

variables.ts

let currencyFormat:string = "NGN" // 

let currencyAmount:number = 450

let isCompleted:boolean = true

let transactionHistory:number[] = [1, 2, 3, 4, 5, 6] 

let username:any = "1234" 

let thirdPartyIntegration: unknown = "https://response.true"