WORK-358
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ID:WORK-358Status:done

Engine config variants: RuneConfig.variants type + axis validation

Add the variants field to RuneConfig — modifier-keyed config deltas — and validate at config load that every variant axis is a declared modifier. This is the foundational type + validation layer for engine config variants.

Priority:criticalComplexity:moderateMilestone:v0.20.0Source:SPEC-091
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Criteria completion

Criteria completion: 3 of 3 (100%) checked; tracking started on Jun 9, no incremental history yet0%25%50%75%100%Jun 9Jun 15

Tracking started Jun 9 — check back for trends.

Relationships

Implements 1
Branches 3
main current done
claude/mcp-server-verify-4lnxej readyclaude/spec-091-engine-variants donemain done

Acceptance Criteria

  • RuneConfig.variants?: Record<modifier, Record<value, Partial<RuneConfig>>> exists in packages/transform/src/types.ts.
  • A variants axis with no matching modifiers entry is a config error at load.
  • A delta may override assembly/decoration fields (layout/structure/styles/contentWrapper/staticModifiers/autoLabel/editHints) but not identity fields (block/modifier axes/sections keys); the allow-list is enforced.

Approach

Mirror the CVA/Tailwind-variants shape but drop the predicate DSL and defaultVariants — the axis is an existing modifier. See SPEC-091 §1, §4.

References

  • SPEC-091

Resolution

Completed: 2026-06-09

Branch: claude/spec-091-engine-variants

What was done

  • Added RuneConfig.variants?: Record<axis, Record<value, Partial<RuneConfig>>> to packages/transform/src/types.ts.
  • packages/transform/src/validate.ts: every variant axis must be a declared modifier (config error otherwise); deltas may not override identity fields (block/modifiers/sections/variants).
  • Tests in packages/transform/test/variants.test.ts cover both invariants.

Notes

  • Identity protection is enforced as a denylist of the named identity fields, matching the AC.