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Turn on R8 minify and resource shrinking for Android release builds - #117
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Play Console flags the release for DEX code optimisation/obfuscation below its threshold. expo-build-properties now sets enableMinifyInReleaseBuilds and enableShrinkResourcesInReleaseBuilds; keep rules go in android.extraProguardRules.
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What / why
Play Console flags release 19 (2.0.0): "DEX code optimisation is below our threshold, Obfuscation (1%)", fix by Feb 2027. The generated
android/app/build.gradledefaultsandroid.enableMinifyInReleaseBuildsto false and app.json never set it, so release builds shipped unshrunk, unobfuscated bytecode.app.json:expo-build-properties>androidgainsenableMinifyInReleaseBuildsandenableShrinkResourcesInReleaseBuilds.plugins/build-properties.test.ts: asserts both.CLAUDE.md: gotcha line (R8 is on; release-only ClassNotFound/NoSuchMethod gets a keep rule inextraProguardRules, never turn minify off; mapping ships in the AAB).Android only. iOS has no equivalent requirement; the JS bundle is Hermes bytecode and unaffected.
Note: the Expo template uses
proguard-android.txt(-dontoptimize), so R8 shrinks and renames but does not optimise. Play only flags the Obfuscation category, which renaming fixes; switching to the optimize profile is a possible follow-up.Verification
Gate green (tsc, lint, format, jest 409 suites / 4949 tests).
Live on a Pixel 6a, release APK built from this branch (side-by-side
app.audiosilo.dev):minifyReleaseWithR8, 95.5% of classes renamed; APK 50.9 MB vs 63.8 MB unminified (about 20% smaller).Pairs with KodeStar/audiosilo-docs (fix/android-r8-minify).