jutsu-expo:expo-config

Configure Expo apps by creating an app.config.js or app.config.ts file that reads environment variables and returns different configuration objects based on NODE_ENV or custom conditions. This approach merges static app.json settings with dynamic logic to apply environment-aware values for API endpoints, feature flags, and build metadata.

Yes, Expo supports typed configuration through app.config.ts files. Use TypeScript to define strongly-typed configuration objects, validate settings at build time, and catch configuration errors before deployment. This ensures type safety across static JSON and dynamic environment-aware configurations.

Merge static app.json with dynamic app.config.js/ts by reading the static file, combining it with programmatically-generated values, and exporting the merged object. This allows you to maintain base configuration in JSON while adding environment-specific overrides, plugin configurations, and conditional logic.

Configure EAS builds by defining environment-specific profiles in eas.json and using app.config.ts to read build context variables. This integrates your dynamic Expo configuration with EAS profiles, enabling separate metadata, plugins, and build settings per environment without duplicating configuration.

Define plugins and metadata dynamically in app.config.js/ts by conditionally adding plugin entries and setting app metadata fields based on environment or build context. This lets you enable different native modules and configure app properties like name, version, and icons per build variant.

Environment variables are optional but recommended for Expo configuration. They let you externalize sensitive values like API endpoints and feature flags, keep configuration DRY across environments, and avoid committing environment-specific secrets to your codebase.