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Unity-SerializeReferenceExtensions — AGENTS.md

Project overview

This repository provides editor tooling for Unity's [SerializeReference], including SubclassSelector to pick concrete implementations of interfaces / abstract types in the Inspector.

Primary risk area: type discovery & filtering (what types appear in the selector).

Repository layout

  • Repository URL: https://github.com/mackysoft/Unity-SerializeReferenceExtensions
  • Package source: Assets/MackySoft/MackySoft.SerializeReferenceExtensions
  • Editor code: .../Editor/**
  • Tests: .../Tests/**

Unity compatibility (critical)

  • Minimum supported Unity: 2021.3 (baseline for development/testing).
  • Unity 2023.2+ has enhanced generic type support (variance, etc.). Changes must not break 2021.3 behavior and guarded by UNITY_2023_2_OR_NEWER.

CI (GitHub Actions)

Use Unity CLI through .github/actions/setup-unity.

  • Run EditMode tests when Unity source, assets, project settings, or the test setup changes. Documentation-only changes can skip Unity tests.
  • Run tests on Linux.
  • Always report the final Verification check on pull requests. It passes only when change detection succeeds and all required EditMode matrix jobs succeed, or Unity tests are not required and are skipped.
  • Build the example player for Linux 64-bit and export the package only in the Release workflow.
  • Release accepts a version tag, updates package.json through the MackySoft Release GitHub App, and builds that exact commit. Configure RELEASE_BOT_APP_ID, RELEASE_BOT_PRIVATE_KEY, and the App's bypass for the pull request rule before releasing.
  • Run a Unity matrix that includes:
    • 2021.3.x (minimum baseline)
    • 2023.2+ (generic/variance feature gate)

How to run tests locally

EditMode

Run tests through Unity CLI (which manages batch mode):

unity --non-interactive test . --editor-version 2021.3.45f2 \
  --mode EditMode --output Logs/TestResults/editmode.xml --timeout 900 \
  -- -nographics -logFile Logs/editmode.log

Repeat with --editor-version 2023.2.22f1 for the generic/variance feature gate.

Architecture guardrails

  • Runtime surface area should remain minimal (mainly attributes / data structures).
  • Editor implementation (PropertyDrawer/UI/type search) must stay under Editor/.
  • Avoid introducing UnityEditor references into Runtime assemblies.

Coding conventions

  • Prefer UnityEditor.TypeCache for type discovery. Avoid full AppDomain scans unless necessary.
  • Keep allocations low in IMGUI paths (e.g., OnGUI).
  • Keep public API stable; if changing type filtering behavior, add/adjust tests.
  • As a general rule, you should follow the restrictions on SerializeReference in Unity's official documentation.