How to Safely Manage EAS Update Channels and Runtime Versions in Expo Apps

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Introducing EAS Update to an Expo app allows JavaScript and image changes to be delivered over-the-air, bypassing app store review cycles. The setup uses three channels — development, preview, and production — each mapped to specific build targets and API environments in eas.json. Runtime versioning is handled via the appVersion policy, ensuring updates are only delivered to binaries sharing the same app version and native configuration. A preview channel using the production API lets teams validate OTA updates under real data conditions before pushing to production. Changes involving native libraries, SDK upgrades, or plugin modifications still require a full store build, making it essential to distinguish OTA-safe changes from those that need new binaries.

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