This runs a server on your machine that can execute Trigger.dev tasks: 
npx trigger.dev@beta dev
You will see in the terminal that the server is running and listening for requests. When you run a task, you will see it in the terminal along with a link to view it in the dashboard. It is worth noting that each task runs in a separate Node process. This means that if you have a long-running task, it will not block other tasks from running.

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Options

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Attaching a local debugger

You can use the --debugger flag to run the server in debug mode. This will allow you to attach a debugger to the server and debug your tasks. 
npx trigger.dev@beta dev --debugger