1. Create a new file at the root of the project called .env.development;
2. Go to your firebase console for your app and download the google-services.json and copy it in the root of your project and remove it from .gitignore
3. Add the following lines with values from your cognito app client for your development environment:

EXPO_PUBLIC_AWS_REGION={{value}} EXPO_PUBLIC_USER_POOL_ID={{value}} EXPO_PUBLIC_USER_POOL_CLIENT_ID={{value}} EXPO_PUBLIC_AWS_DOMAIN={{value}}

4. Create a new build either a local build with npx expo prebuild --platform <platform> or a new eas build to be downloaded: eas build --platform all --profile development. Using the prebuild value since it's not an eas build it will require us to have also the environment variables from the eas.json in the .env.development created at point 1.
5. Run the the app in development mode: npm run start

1. Create a new file at the root of the project called .env.test;
2. Check if the google-services.json is present in the secrets (eas secret:list), otherwise go to your firebase console for your app and download the google-services.json and copy it in the root of your project
3. Add the following lines with values from your cognito app client for your test environment:

EXPO_PUBLIC_AWS_REGION={{value}} EXPO_PUBLIC_USER_POOL_ID={{value}} EXPO_PUBLIC_USER_POOL_CLIENT_ID={{value}} EXPO_PUBLIC_AWS_DOMAIN={{value}}

4. Update your eas secrets with the values from your .env file with eas secret:push --scope project --env-file ./.env.test
5. Create a new eas build eas build --platform all --profile preview
6. Download the build from expo.dev.
7. Start testing :)

1. Create a new file at the root of the project called .env.production;
2. Check if the google-services.json is present in the secrets (eas secret:list), otherwise go to your firebase console for your app and download the google-services.json and copy it in the root of your project. If not present in secrets push it.
3. Add the following lines with values from your cognito app client for your production environment:

EXPO_PUBLIC_AWS_REGION={{value}} EXPO_PUBLIC_USER_POOL_ID={{value}} EXPO_PUBLIC_USER_POOL_CLIENT_ID={{value}} EXPO_PUBLIC_AWS_DOMAIN={{value}}

4. Update your eas secrets with the values from your .env file with eas secret:push --scope project --env-file ./.env.production
5. Update buildNumber and versionCode from your app.json file and commit them.
6. Create a new eas build eas build --platform all --profile production
7. Upload the build through Testflight/Stores

1. Environment variables values precedence
2. Local build
3. Prebuild