Expo Application Services (EAS): The Cloud Toolchain for React Native
EAS provides hosted builds, submissions, and updates for Expo and React Native projects. Use eas build for installable binaries, eas submit for store uploads, and eas update only for compatible JavaScript or asset changes.
EAS is a set of hosted delivery services. EAS Build creates Android and iOS binaries; EAS Submit uploads a build to store consoles; EAS Update distributes compatible JavaScript and asset changes through expo-updates.
Example
After installing EAS CLI, signing in and configuring the project, these commands build, submit and publish an update. Each is a separate action; store uploads still need review before public release.
eas build --platform all
eas submit --platform android
eas update --branch productionUse npx expo start for local development.
Watch out for
EAS Update cannot replace a store build when native code, native dependencies, or the runtime changes. Configure runtime compatibility and a rollout strategy first. EAS is useful for Expo and existing React Native projects, but it is not mandatory when another build or CI pipeline meets the need.
Interview question
When is it most appropriate to use Expo Application Services (EAS)?
- a.During the initial phase of development to quickly prototype UI components in Expo Go.
- b.For managing project dependencies and installing native modules directly on your local machine.
- c.To start a local development server and debug JavaScript code on a simulator or device.
- d.When preparing a production-ready build for app store submission or pushing over-the-air updates.Correct
Why? this is the answer
EAS is designed for production workflows, handling cloud builds, app store submissions, and over-the-air updates for React Native apps. It is explicitly stated as distinct from local development tools like the `expo` CLI, which are used for prototyping and running local development servers.
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