default_plugin_repro

A sample repro to reproduce the following error message:

Package amplify_secure_storage:linux references amplify_secure_storage_dart:linux as the default plugin, but the
package does not exist.
Ask the maintainers of amplify_secure_storage to either avoid referencing a default implementation via `platforms:
linux: default_package: amplify_secure_storage_dart` or create a plugin named amplify_secure_storage_dart.


Package amplify_secure_storage:windows references amplify_secure_storage_dart:windows as the default plugin, but the
package does not exist.
Ask the maintainers of amplify_secure_storage to either avoid referencing a default implementation via `platforms:
windows: default_package: amplify_secure_storage_dart` or create a plugin named amplify_secure_storage_dart.

Repo Steps

1. Clone repro
2. Checkout Flutter master channel, flutter channel master
   1. Error is present atleast between >=3.24.0-1.0.pre.151 >3.24.0-1.0.pre.180
3. Run $ flutter pub get.
4. Error should be present. App will also fail to compile.
   1. Alternative: switch to Flutter stable channel and dependencies resolve along with the app compiling.

Context

The Amplify Secure Storage plugin uses the current documented method of defining a endorsed package using the key: default_package.

amplify_secure_storage pubspec.yaml

flutter:
  plugin:
    platforms:
      android:
        package: com.amazonaws.amplify.amplify_secure_storage
        pluginClass: AmplifySecureStoragePlugin
      ios:
        pluginClass: AmplifySecureStoragePlugin
      macos:
        pluginClass: AmplifySecureStoragePlugin
      windows:
        default_package: amplify_secure_storage_dart
      linux:
        default_package: amplify_secure_storage_dart
      web:
        default_package: amplify_secure_storage_dart

This is no longer a valid method on the Master channel. This appears to be a bug related to the introduction of feat: Support overriding native endorsed plugins #137040. As of now, no documentation has been updated or proposed around not using default_package. Reference in-flight docs.

Acknowledging the error message says to use pluginClass or dartPluginClass, doing so does resolve the error. However, it is unclear why the previous method is no longer valid.

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For reference: amplify_secure_storage_dart pubspec.yaml