[SEVERE] mockito:mockBuilder - The getter 'isDartCoreObject' was called on null

[gmcdowell]

overview

• unable to run flutter packages pub run build_runner build --delete-conflicting-outputs
• isolated to use of loggy package [I have migrated this pkg to null-safety as part of trouble-shoot efforts - see pubspec.yaml]

how to replicate

• i have put together a demo repo for ease of replication
• once cloned & pub get, try running cmd flutter packages pub run build_runner build --delete-conflicting-outputs --verbose - output should point to package:mockito/src/builder.dart line737:26
• from there i'm at a bit of a loss, so any guidance appreciated.

flutter doctor
`
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel dev, 2.1.0-10.0.pre, on macOS 11.2.2 20D80 darwin-x64, locale en-NZ)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[✓] Xcode - develop for iOS and macOS
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.1)
[✓] IntelliJ IDEA Ultimate Edition (version 2020.3.2)
[✓] VS Code (version 1.53.2)
[✓] Connected device (2 available)

• No issues found!
`

[gmcdowell]

reciprocal link to loggy repo issue to keep all in loop.

[srawlins]

Thank so much for the repro! I'll investigate this in the next 24 hours.

[srawlins]

I can reproduce this. It has to do with the superclass mixing in a mixin. I've mailed a fix internally. Hope to release a fix to pub soon.

[srawlins]

Fixed in 5.0.1