In most cases, though, this isnt needed. The Visual Studio Code instructions use the .NET CLI for ASP.NET Core development functions such as project creation. If you have an existing TypeScript project, you can add a predeploy hook to Keys of WeakMaps are of the type Object only. Now, we can use this list to generate a new type which has been shown in the below code. Map.keys() returns a MapIterator object which can be converted to Array using Array.from in typescript. Its purpose is to store the SignalR hub, which is created in the next step. Replace the code that displays Hello World! For example: Edit firebase.json to add a predeploy hook to run the build script. Create a new src/css directory. For more information, see the npm-install documentation. Copy the signalr.js file to the wwwroot/lib/signalr folder.. Reference the SignalR JavaScript client in the