app.json / app.config.js

The app.json & app.config.js files are used to configure your React Native / Expo project.

Ignite has already configured several things for us:

• App Icons - configured for iOS, Android, and Web. Check out App Icon Generators to update your App Icon.
• Splash Screen colors and images - configured for iOS, Android, and Web. Check out Splash Screen Generators to update your Splash Screen.
• Expo plugins for things like localization and splash screens

See Expo's Documentation on App.json Configuration for more details.