WORK-358
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ID:WORK-358Status:ready

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
claude/mcp-server-verify-4lnxej View source

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Relationships

Implements 1
Branches 2
claude/mcp-server-verify-4lnxej current ready
claude/spec-091-engine-variants donemain done
History 1
  1. 1da59d6
    Created (ready)by bjornolofandersson

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