Huge size difference between app bundles build by pure react native & expo bare workflow

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I have build two app bundles for same application by pure react native (version 0.66) and expo bare workflow (expo eject, expo version: 42.0.1, react-native version: 0.63.4 )

Build by App bundle size (mb)
Pure react native 29
Expo bare (eject) 14

There is a huge size difference (15 mb) between two app bundles.

When I looked into app bundles for my device I found that config.arm64_v8a.apk has two different sizes.

Build by config.arm64_v8a.apk(mb) base.apk(mb)
Pure react native 18.2 12.2
Expo bare (eject) 11.5 12.7

I couldn't find out why config.arm64_v8a.apk has two file sizes in these two flows.

Why expo bare workflow app bundle is so small ? Is this because currently expo use react-native 0.63.4 or does expo has some additional app bundle size reducing method(s) ?

Thank you.

expo react-native
2 Answers

Expo has recently published a blog post about app bundling.

bundle sizes are also smaller by about 18% in “Hello World” apps. This is because many libraries are already shipped in an optimal format, and by needlessly transforming them with a random Babel cocktail, we increase the size, but only a little bit, and everywhere.

I think it's an interesting read (and good source!) for what you're looking for: https://blog.expo.dev/drastically-faster-bundling-in-react-native-a54f268e0ed1

user_133713230

Put android:extractNativeLibs="true" into the AndroidManifest.xml under application tag

user_61914490
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