AUR5002

Error Message

AUR5002: invalid config, expecting a function or an object, received {{value}}

Where {{value}} is the type of the invalid parameter passed to the configure method.

Description

This error occurs when HttpClient.configure() is called with a parameter that is neither a function nor a configuration object. The configure method accepts either:

1. A callback function that receives a configuration object

2. A plain configuration object

Common Scenarios

Passing Invalid Types

import { HttpClient } from '@aurelia/fetch-client';

const client = new HttpClient();

// ❌ Wrong: Passing a string
client.configure('invalid'); // Throws AUR5002

// ❌ Wrong: Passing a number  
client.configure(123); // Throws AUR5002

// ❌ Wrong: Passing null/undefined
client.configure(null); // Throws AUR5002

Solutions

1. Use Configuration Callback (Recommended)

// ✅ Correct: Pass a configuration function
client.configure(config => {
  return config
    .withBaseUrl('https://api.example.com')
    .withDefaults({
      headers: { 'Content-Type': 'application/json' }
    });
});

2. Use Configuration Object

// ✅ Correct: Pass a configuration object
const configObject = {
  baseUrl: 'https://api.example.com',
  defaults: {
    headers: { 'Content-Type': 'application/json' }
  }
};

client.configure(configObject);

Debugging Tips

1. Check Parameter Type: Ensure you're passing a function or object

2. Verify Syntax: Make sure callback syntax is correct

3. TypeScript: Use TypeScript to catch type errors at compile time