wp-using-signalr-core-with-typescript-and-webpack-in-an-asp-net-core-2-1-web-application-12.ts3

const connection = new signalR.HubConnectionBuilder()
    .withUrl("/hub")
    .build();

connection.start().catch(err => document.write(err));

connection.on("messageReceived", (username: string, message: string) => {
    let m = document.createElement("div");

    m.innerHTML = `<div class="message__author">${username}</div><div>${message}</div>`;

    divMessages.appendChild(m);
    divMessages.scrollTop = divMessages.scrollHeight;
});