Represent nullable and optional fields distinctly in clients
An omitted patch field is serialized as null and clears a partner record.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- TypeScript · Serialization
Estimated field mix
- Developer tooling60%
- API design40%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional partner platform publishes TypeScript clients. Generator upgrades create noisy diffs, occasional runtime mismatches, and uncertainty about which schema was packaged.
Setup prerequisites
- Create a small public API schema and two local mock server versions; use a temporary local package registry or archive files.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Model omitted and explicit null independently.
- Omit undefined values during serialization.
- Preserve null only where the schema allows it.
Implementation constraints
- Avoid broad type assertions that erase schema distinctions.
Verification to include
- Patch one field without clearing another.
- Reject null for a non-nullable field.
Deliverables
- Serialization correction.
Rollout and recovery
Release as a reviewed compatibility fix; restore the prior artifact if unrelated payloads change.
Value of the work
For the engineer: Practice reproducible generation, compatibility reviews, and package provenance.
For the team: Reduce partner integration surprises with reviewable clients and recoverable releases.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.