\n\nQuick Guide: EAS (Expo Application Services) handles cloud builds, OTA updates, and app store submission. Use build profiles in
\neas.jsonto separate development/preview/production builds. Use EAS Update with runtime version fingerprinting for safe OTA deploys. Use--environmentflag (SDK 55+) instead of--channelwhen publishing updates. Let EAS manage credentials unless you have enterprise requirements.
<critical_requirements>
\n\n\nAll code must follow project conventions in CLAUDE.md (kebab-case, named exports, import ordering,
\nimport type, named constants)
(You MUST use the --environment flag with eas update on SDK 55+ projects -- the --channel flag is replaced)
(You MUST set runtimeVersion with \"fingerprint\" policy for projects with native dependencies -- mismatched runtime versions crash apps on OTA update)
(You MUST use EAS Secrets for sensitive values -- NEVER put API keys or tokens in eas.json env blocks or EXPO_PUBLIC_ variables)
(You MUST run eas build from the app directory in monorepos -- NOT from the repository root)
</critical_requirements>
\nAuto-detection: EAS Build, EAS Update, EAS Submit, eas.json, eas build, eas update, eas submit, eas credentials, eas secret, EAS Workflows, build profiles, OTA updates, runtime version, fingerprint policy, app store submission, code signing, eas-cli
\nWhen to use:
\nKey patterns covered:
\neas.json build profiles with inheritance (extends)autoIncrement and appVersionSourceWhen NOT to use:
\nnpx expo run:ios/android without EASDetailed Resources:
\n<red_flags>
\nHigh Priority Issues:
\n--channel on SDK 55+ projects -- replaced by --environment flag; old flag no longer worksruntimeVersion in app config -- OTA updates fail silently or crash on incompatible buildseas.json env blocks -- config is committed to version control; use EAS Secrets insteadeas build from monorepo root -- must run from the app directory (apps/mobile/, not repo root)autoIncrement for production -- Android versionCode must strictly increase; Play Store rejects same or lower valuesMedium Priority Issues:
\ndistribution: \"store\" for preview builds -- use \"internal\" for ad hoc/internal distributionresourceClass -- default may be slow for large projects; \"medium\" or \"large\" speeds up builds--non-interactive in CI -- EAS prompts for input by default; CI pipelines hang without this flag--auto-submit when build + submit are always paired -- saves a manual step and avoids submitting the wrong buildGotchas & Edge Cases:
\nfingerprint policy can be too aggressive -- may flag changes that don't affect native code, forcing unnecessary rebuildseas credentialsautoIncrement: \"version\" vs \"buildNumber\" -- \"version\" bumps the user-visible version string; \"buildNumber\" bumps the internal build number onlyappVersionSource: \"remote\" requires paid plan -- tracks versions server-side; free tier must manage locallybuildType: \"apk\" is for testing only -- Play Store requires \"app-bundle\" (AAB) for production submissionsextends depth limit is 5 levels -- circular dependencies cause build errorsdevelopment-device profile with \"simulator\": false</red_flags>
\n<critical_reminders>
\n\n\nAll code must follow project conventions in CLAUDE.md
\n
(You MUST use the --environment flag with eas update on SDK 55+ projects -- the --channel flag is replaced)
(You MUST set runtimeVersion with \"fingerprint\" policy for projects with native dependencies -- mismatched runtime versions crash apps on OTA update)
(You MUST use EAS Secrets for sensitive values -- NEVER put API keys or tokens in eas.json env blocks or EXPO_PUBLIC_ variables)
(You MUST run eas build from the app directory in monorepos -- NOT from the repository root)
Failure to follow these rules will cause OTA update crashes, credential exposure, and build failures.
\n</critical_reminders>
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