User Authentication Service

Build a user authentication service that supports user registration and login with email/password credentials.

Requirements

Implement the following functionality:

1. User Registration

   • Create a function that accepts an email and password
   • Register the user in the authentication system
   • Return the user data and session information upon successful registration
   • Handle any errors that may occur during registration

2. User Login

   • Create a function that accepts an email and password
   • Authenticate the user with the provided credentials
   • Return the user data and session information upon successful login
   • Handle any errors that may occur during login

3. Session Retrieval

   • Create a function that retrieves the current authenticated user's session
   • Return the session data if available, or null if no active session exists

4. User Sign Out

   • Create a function that signs out the current user
   • End the user's session

Technical Details

• The authentication service should be initialized with a URL and API key
• All functions should return structured responses that include both data and error information
• Handle edge cases such as invalid credentials, existing users, and network errors

Dependencies { .dependencies }

@supabase/supabase-js { .dependency }

Provides authentication and backend services support.

Test Cases

Test 1: User Registration { .test }

File: auth.test.ts

Input:

email: "newuser@example.com"
password: "SecurePass123!"

Expected behavior:

• The registration function should successfully create a new user
• Should return a response containing user data (with at least an email field)
• Should return a response containing session data (with at least an access token)

Test 2: User Login { .test }

File: auth.test.ts

Input:

email: "existinguser@example.com"
password: "MyPassword456!"

Expected behavior:

• The login function should successfully authenticate the user
• Should return a response containing user data
• Should return a response containing session data with access token

Test 3: Invalid Login { .test }

File: auth.test.ts

Input:

email: "user@example.com"
password: "WrongPassword"

Expected behavior:

• The login function should handle the error gracefully
• Should return a response with an error indicating invalid credentials
• Should not return user or session data

Notes

• You do not need to set up a real backend - focus on implementing the client-side authentication logic
• Ensure all functions handle errors appropriately and return consistent response structures
• The implementation should be straightforward for someone familiar with authentication libraries