A specific Bun version is currently required for the dev command to work. This is due to a bug with IPC. Please use Bun version 1.1.24 or lower: curl -fsSL https://bun.sh/install | bash -s -- bun-v1.1.24
We now have experimental support for Bun. This guide will show you have to setup Trigger.dev in your existing Bun project, test an example task, and view the run.

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Prerequisites

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Initial setup

1

Run the CLI `init` command

The easiest way to get started is to use the CLI. It will add Trigger.dev to your existing project, create a /trigger folder and give you an example task.Run this command in the root of your project to get started:
npx trigger.dev@latest init --runtime bun
It will do a few things:
  1. Log you into the CLI if you’re not already logged in.
  2. Create a trigger.config.ts file in the root of your project.
  3. Ask where you’d like to create the /trigger directory.
  4. Create the /src/trigger directory with an example task, /src/trigger/example.[ts/js].
Install the “Hello World” example task when prompted. We’ll use this task to test the setup.
2

Update example.ts to use Bun

Open the /src/trigger/example.ts file and replace the contents with the following:
example.ts
import { Database } from "bun:sqlite";
import { task } from "@trigger.dev/sdk/v3";

export const bunTask = task({
  id: "bun-task",
  run: async (payload: { query: string }) => {
    const db = new Database(":memory:");
    const query = db.query("select 'Hello world' as message;");
    console.log(query.get()); // => { message: "Hello world" }

    return {
      message: "Query executed",
    };
  },
});
3

Run the CLI `dev` command

The CLI dev command runs a server for your tasks. It watches for changes in your /trigger directory and communicates with the Trigger.dev platform to register your tasks, perform runs, and send data back and forth.It can also update your @trigger.dev/* packages to prevent version mismatches and failed deploys. You will always be prompted first.
npx trigger.dev@latest dev
4

Perform a test run using the dashboard

The CLI dev command spits out various useful URLs. Right now we want to visit the Test page .You should see our Example task in the list , select it. Most tasks have a “payload” which you enter in the JSON editor , but our example task doesn’t need any input.Press the “Run test” button .Test page
5

View your run

Congratulations, you should see the run page which will live reload showing you the current state of the run.Run pageIf you go back to your terminal you’ll see that the dev command also shows the task status and links to the run log.Terminal showing completed run

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Known issues

  • Certain OpenTelemetry instrumentation will not work with Bun, because Bun does not support Node’s register hook. This means that some libraries that rely on this hook will not work with Bun.