Variables
Const btnSend
btnSend: HTMLButtonElement = document.querySelector("#btnSend")
Const connection
connection: HubConnection = new signalR.HubConnectionBuilder().withUrl("/hub").build()
Const divMessages
divMessages: HTMLDivElement = document.querySelector("#divMessages")
Const tbMessage
tbMessage: HTMLInputElement = document.querySelector("#tbMessage")
Const username
username: number = new Date().getTime()