Jest Testing

In Node.js, App Config might work without any configuration.

For Webpack projects, it might be a little more complicated, because you don't call loadConfig first. App Config is fairly easy to mock in Jest.

jest.mock('@app-config/main', () => { const config = { externalApiUrl: 'http://localhost:3002', }; return { __esModule: true, config, default: config, }; }); 

You can use manual mocks (opens new window) as well, which might be more convenient.