kuru-kuru/.codesandbox/tasks.json

{
  // These tasks will run in order when initializing your CodeSandbox project.
  "setupTasks": [],

  // These tasks can be run from CodeSandbox. Running one will open a log in the app.
  "tasks": {
    "deno task start": {
      "name": "deno task start",
      "command": "deno task start",
      "runAtStart": true,
      "preview": {
        "port": 8000
      }
    }
  }
}