This demo is a full stack example that demonstrates how to use Trigger.dev Realtime to build a CSV Uploader with live progress updates. The frontend is a Next.js app that allows users to upload a CSV file, which is then processed in the background using Trigger.dev tasks. The progress of the task is streamed back to the frontend in real-time using Trigger.dev Realtime.

• A Next.js app with Trigger.dev for the background tasks.
• UploadThing to handle CSV file uploads
• Trigger.dev Realtime to stream updates to the frontend.
• Uses Bun as the JavaScript runtime and package manager for improved performance.

1. After cloning the repo, run bun install to install the dependencies.
2. Copy the .env.example file to .env and fill in the required environment variables. If you haven't already, sign up for a free Trigger.dev account here and create a new project.
3. Copy the project ref from the Trigger.dev dashboard and and add it to the trigger.config.ts file.
4. Run the Next.js server with bun run dev.
5. In a separate terminal, run the Trigger.dev dev CLI command with bun run trigger:dev (it may ask you to authorize the CLI if you haven't already).

Now you should be able to visit http://localhost:3000 and see the app running. Upload a CSV file and watch the progress bar update in real-time!

• View the Trigger.dev task code in the src/trigger/csv.ts file.
• The parent task csvValidator downloads the CSV file, parses it, and then splits the rows into multiple batches. It then does a batch.triggerAndWait to distribute the work the handleCSVRow task.
• The handleCSVRow task "simulates" checking the row for a valid email address and then updates the progress of the parent task using metadata.parent. See the Trigger.dev docs for more information on how to use the metadata.parent object.
• The useRealtimeCSVValidator hook in the src/hooks/useRealtimeCSVValidator.ts file handles the call to useRealtimeRun to get the progress of the parent task.
• The CSVProcessor component in the src/components/CSVProcessor.tsx file handles the file upload and displays the progress bar, and uses the useRealtimeCSVValidator hook to get the progress updates.

To learn more about Trigger.dev Realtime, take a look at the following resources:

• Trigger.dev Documentation - learn about Trigger.dev and its features.
• Metadata docs - learn about the Run Metadata feature of Trigger.dev.
• Batch Trigger docs - learn about the Batch Trigger feature of Trigger.dev.
• Realtime docs - learn about the Realtime feature of Trigger.dev.
• React hooks - learn about the React hooks provided by Trigger.dev.