expo-native-dependency-hash - Simplified native dependency tracking for React Native

expo-native-dependency-hash strives to make it easier to keep track of when the native dependencies of a Expo (or React Native) project has changed. It does so by (1) detecting native modules in node_modules and (2) generating a hash based on those package names and versions. It provides these commands:

• expo-app-verify [rootDir] Check if hash has changed, good for CI and git hooks
• expo-app-update [rootDir] Update hash representing this apps native dependencies
• library-verify [rootDir] Check if hash has changed, fails if it has, good for CI and git hooks
• library-update [rootDir] Updates the hash based on the native files in the project
• list [rootDir] Lists all native dependency identities of an app
• hash [rootDir] Returns the hash for piping

Note: This was previously called expo-native-dependency-hash, but with the 2.0 release it was renamed to expo-native-dependency-hash to better reflect its purpose.

Recipes

Update your runtimeVersion automatically when native dependencies has changed

Run expo-native-dependency-hash on postinstall to always keep it up to date:

{
    "scripts": {
        "postinstall": "expo-native-dependency-hash expo-app-update"
    }
}

This will automatically update your runtimeVersion in your app.json. So when native dependencies has changed in your project, you'll get a new runtimeVersion to easily target the right binary with your OTA updates.

Verify that your runtimeVersion is up to date

Run expo-native-dependency-hash expo-app-verify in a CI or git hook to verify that your runtimeVersion is up to date. This will fail if it's not up to date.

OTA updates / Expo release channels

Use one release channel per hash to get predictability in your OTA updates.

expo publish --release-channel `expo-native-dependency-hash hash`

or

expo publish --release-channel `cat .expo-native-dependency-hashrc`

Generate a new Native Client when native dependencies has changed

Generate new native builds automatically when it's needed.

A simple example of how it can be done with GitHub Actions and EAS Build:

      - name: Get Hash
        run: echo "HASH=`npx expo-native-dependency-hash hash`" >> $GITHUB_ENV

      # Check if there has exists a build for this native hash
      - name: Matching Native Builds
        run: echo "MATCHING_BUILDS=`npx eas-cli@latest build:list --platform=ios --status=finished | grep -c $HASH`" >> $GITHUB_ENV

      # Publish bundle if there is already a Native Build for this hash out there:
      - name: Expo Publish
        id: expo-publish
        if: ${{ env.MATCHING_BUILDS > 0 }}
        run: eas update

      # Build new Native Client if there are no
      - name: EAS Build
        id: eas-build
        if: ${{ env.MATCHING_BUILDS == 0 }}
        run: npx eas-cli@latest build --platform ios --non-interactive --no-wait

• There are obviously edge cases in this simple implementation; we could check per platform and for builds that are in progress so we don't build duplicates etc..

What is included in the hash

We detect native modules by looking for ios and/or android folders in each package. Please post an issue (PRs are welcome :) for any false positives/negatives you might find! To see whether everything looks right you can use expo-native-dependency-hash list for a full list of libraries that we detect as being native. The hash is by default a-native-module@1.0.0 but if setting the nativeDependencyHash prop in package.json the libraries indicate whether a new version requires a new native build, then the hash will look like a-native-module@the-specified-native-hash.

If there is an app.json (as used by Expo) present some of its contents will also be included in the generated hash (see androidPropsToHash, iosPropsToHash and expoPropsToHash in index.js for an up-to-date-list).

If you have a native or bare project the contents of your iOS and Android folder is also hashed (any change, even a whitespace change, will result in a new hash).