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First, make sure you have installed TypeScript globally on your system using the command npm install -g typescript.

Next, navigate to the root directory of your TypeScript project and open a terminal window.

Run the tsc --watch command in the terminal to compile your TypeScript files and watch for changes.

Open a new terminal window and navigate to the directory where your server code is located.

Start your server by running the appropriate server command. This will depend on your server framework and configuration. For example, if you're using Node.js and Express, you can start your server with the command node app.js or npm start.

Leave both terminal windows open and running in the background. Any changes you make to your TypeScript files will be automatically compiled and saved, and your server will stay up and running.

Test your application by accessing it in a web browser or through an API testing tool like Postman.