[JuroUhlar]

• Option B spike: unflattened Event oneOf wrapper (EventDevice | EventEdge, discriminator source).
• Event.UnmarshalJSON inserts source=device when the key is absent (same as koala eventsource.HydrateMissing). Never rewrites source:edge or an existing source.
• Isolated hydrate test in test/eventhydrate (the rest of test/ still does not compile on this spike).
• Do not merge. Option C (flat Event, optional source) is PR 102.

Discussion point: hydrate in UnmarshalJSON

Stock codegen returns nil (both pointers unset) when source is missing. This post-generate edit rematerializes the JSON with source: device so EventDevice required-field checks pass and the device pointer is set.

Known issue: CI will fail

Examples and tests that read event.Identification are expected not to compile. That is the spike.

[github-actions]

⚠️ Template files and generated files are not in-sync.

Following files do not match corresponding templates:
internal/openapi/.openapi-generator-ignore internal/openapi/event_source.go internal/openapi/model_event.go models.go

To fix this warning, make sure template files are up-to-date, and generate files by running the following command:

./bin/openapi-codegen-docker.sh

[github-actions]

⚠️ This PR doesn't contain any changesets. If there are user-facing changes, don't forget to run:

pnpm exec changeset

to create a changeset.

[github-actions]

Wrong commit message format detected

We use Semantic Commit Messages in our project.

Warning
Probably you forgot to activate local git hooks.

Run the next command in the project root to activate local hooks:

sh ./install_hooks.sh

More info you can find in job logs

Commitlint Errors

Commit: 6fcf7cc `chore: SPIKE Event oneOf discriminated union

INTER-2457. Regenerated Event as a oneOf wrapper to show the compile break. Do not merge.`
Errors:

• subject must not be sentence-case, start-case, pascal-case, upper-case

---

[JuroUhlar]

This was a prototype done as part of a spike. Closing now, still usable as a reference during the production implementation.