how to exit all async command in deno task?

{
  "tasks": {
    "dev-server": "deno run --watch --allow-read --allow-net --allow-env dev.ts",
    "dev-client": "deno run -A --unstable --node-modules-dir npm:vite",
    "dev": "deno task dev-client & deno task dev-server"
  }

}