Support using environment variables to customize the app's behaviour, as documented by Expo. Environment variables must be set in various locations depending on the workflow: development must run as part of expo npm command, builds must be present in appropriate channels in eas.json, and updates must be present as env variables. Variables can be accessed either in app.config.ts or from the expo-constants library (can use optional env.config.ts file wrapper).
Changes
Pass environment variables to builds in eas.json
Investigate passing environment variables in development
Access environment variables in env.config.ts (with defaults)
Investigate and document how to support env vars in updates
Description
Support using environment variables to customize the app's behaviour, as documented by Expo. Environment variables must be set in various locations depending on the workflow: development must run as part of
exponpm command, builds must be present in appropriate channels ineas.json, and updates must be present as env variables. Variables can be accessed either inapp.config.tsor from theexpo-constantslibrary (can use optionalenv.config.tsfile wrapper).Changes
eas.jsonenv.config.ts(with defaults)