[native_assets] Use `hook/build.dart` instead of `build.dart`

[juliansteenbakker]

Is there an existing issue for this?

• I have searched the existing issues
• I have read the guide to filing a bug

Steps to reproduce

1. upgrade to flutter 3.16
2. run flutter build ios

This only happens on my local app, not on an empty app.

I don't know why this happens. The --enable-native-assets is only available on the master channel, so it does not work on stable. However app building was fine with version 3.13 of flutter. What is causing this message?

I have tried:

• pod deintegrate and pod install
• flutter clean

Other OS'es seem to work, like macOS or Android.

Expected results

Build successfull

Actual results

Running Xcode build...
Xcode archive done. 53,8s
Failed to build iOS app
Error (Xcode): Target native_assets failed: Exception: Package(s) x require the native assets feature to be enabled. Enable using flutter config --enable-native-assets.

Logs

Logs

Archiving com.x.x...
Automatically signing iOS for device deployment using specified development team in Xcode project: x
Running pod install...                                              4,8s
Running Xcode build...                                                  
Xcode archive done.                                         53,8s
Failed to build iOS app
Error (Xcode): Target native_assets failed: Exception: Package(s) x require the native assets feature to be enabled. Enable using `flutter config --enable-native-assets`.

Flutter Doctor output

Doctor output

[✓] Flutter (Channel stable, 3.16.0, on macOS 14.1.1 23B81 darwin-x64, locale nl-NL)
    • Flutter version 3.16.0 on channel stable at /usr/local/Caskroom/flutter/2.10.4/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision db7ef5bf9f (5 days ago), 2023-11-15 11:25:44 -0800
    • Engine revision 74d16627b9
    • Dart version 3.2.0
    • DevTools version 2.28.2

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.1)
    • Android SDK at /Users/julian/Library/Android/sdk
    • Platform android-34, build-tools 33.0.1
    • Java binary at: /Users/julian/Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.0.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 15A507
    • CocoaPods version 1.14.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.3)
    • Android Studio at /Users/julian/Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)

[✓] VS Code (version 1.84.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension can be installed from:
      🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (4 available)
    • SM F926B (mobile)   • RFCR812ZT6L                              • android-arm64  • Android 13 (API 33)
    • iPhone (3) (mobile) • 9b4d7d982f89bd9a36ad4cef025328faa9254d59 • ios            • iOS 12.5.7 16H81
    • macOS (desktop)     • macos                                    • darwin-x64     • macOS 14.1.1 23B81 darwin-x64
    • Chrome (web)        • chrome                                   • web-javascript • Google Chrome 119.0.6045.159
    ! Error: Browsing on the local area network for iPad van Julian (2). Ensure the device is unlocked and attached with a cable or associated with the same local area network as this Mac.
      The device must be opted into Developer Mode to connect wirelessly. (code -27)
    ! Error: Browsing on the local area network for iPhone van Robin. Ensure the device is unlocked and attached with a cable or associated with the same local area network as this Mac.
      The device must be opted into Developer Mode to connect wirelessly. (code -27)

[✓] Network resources
    • All expected network resources are available.

• No issues found!

[hellohuanlin]

cc @dcharkes

[dcharkes]

The error message comes from an experimental feature we're working on:

• ☂️ Build hooks & Code assets #129757

This message should only trigger if there is a top-level build.dart file in either your app or one of your apps dependencies. Is there such a file present? The package name should tell you for which package it tried to run build.dart.

If that is not the case, could you try deleting files/code from your project until you get to an empty app (which you report working)? Maybe this will help triaging what is causing this.

[juliansteenbakker]

You are right, i have both a build.dart and build.yaml file present, because it is required by swagger_dart_code_generator. When i remove these files the problem is fixed. However, i still need to use the package.

[dcharkes]

That is unfortunate, we did a survey of build.dart use as a top-level file name and didn't find any uses earlier. I have filed dart-lang/sdk#54111 to make the build.dart file name configurable in Dart (and if the configuration is not provided, don't run native assets).

We'll keep this issue open to do the same in Flutter.

Side note: swagger_dart_code_generator maybe should also consider making the file name configurable, it might conflict with more things than native assets.

[dcharkes]

(One hacky workaround: Ensure that the build.dart also conforms to the native assets protocol, and just outputs no assets, and enable the feature.)

[dcharkes]

You are right, i have both a build.dart and build.yaml file present, because it is required by swagger_dart_code_generator. When i remove these files the problem is fixed. However, i still need to use the package.

@juliansteenbakker I see that epam-cross-platform-lab/swagger-dart-code-generator#681 was closed. Since so far this has been the only use of build.dart conflicting, we're considering whether it would be possible to keep build.dart for native assets and have swagger migrate instead. I don't know enough about the code generator project. I don't see any mention of a build.dart in the swagger documentation, could you elaborate on why the build.dart is needed?