TypeError: autodiscover_tasks() requires at least 2 arguments (1 given) with Celery - TypeScript

If you are encountering the "TypeError: autodiscover_tasks() requires at least 2 arguments (1 given)" error message while using Celery with TypeScript, this guide will help you understand and resolve the issue.

What is Celery?

Celery is an asynchronous task and message passing library that enables distributed processing in Python. It allows you to run tasks asynchronously across different workers and supports various message brokers like RabbitMQ, Redis, etc. Celery is widely used for handling background tasks, scheduling periodic tasks, and integrating with web frameworks.

Understanding the Error

The error message "TypeError: autodiscover_tasks() requires at least 2 arguments (1 given)" typically occurs when using Celery in conjunction with Django or some other framework. This error suggests that the autodiscover_tasks function is being called with an insufficient number of arguments.

The autodiscover_tasks function is used to automatically discover and register tasks in your application. It requires at least two arguments: a module path and a namespace. The module path specifies where to search for task modules, while the namespace provides a unique identifier for the tasks.

Solution

To fix the "TypeError: autodiscover_tasks() requires at least 2 arguments (1 given)" error, make sure you are passing both the module path and namespace to the autodiscover_tasks function correctly.

Here's an example of how to call autodiscover_tasks in your TypeScript code:

import * as celery from 'celery-ts';

const app = celery.createCeleryApp('<broker_url>');
app.autodiscoverTasks('path.to.tasks', 'task_namespace');

In the above code, replace <broker_url> with the URL of your chosen message broker (e.g., RabbitMQ, Redis). Then, provide the correct module path and namespace for your tasks.

Make sure you have the celery-ts package installed in your TypeScript project. You can install it using npm or yarn:

npm install celery-ts

or

yarn add celery-ts

Additional Tips

• Verify that your task modules are placed in the correct folder or package path specified in the autodiscover_tasks function.
• Double-check the spelling and syntax of the module path and namespace.
• Ensure that you have the required dependencies installed (e.g., Django, Celery, celery-ts).
• If you are using Django, make sure you have the necessary Django settings configured for Celery to work correctly.

By following these suggestions, you should be able to resolve the "TypeError: autodiscover_tasks() requires at least 2 arguments (1 given)" error and successfully utilize Celery with TypeScript.