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FUI5004: Required companion component is missing from the region

moderate

A region contains a component that the composition policy requires to be paired with a companion that is absent.

Details

diagnostic
{
  "code": "FUI5004",
  "ruleId": "composition/co-occurrence",
  "category": "Composition",
  "defaultSeverity": "moderate",
  "lifecycle": "experimental",
  "fixAvailable": false,
  "evidenceRequired": true
}

Guidance

Add the required companion component to the region, or remove the component that triggers the requirement. The validated case is an action group: a primary Button should be accompanied by a secondary Button — an outline or cancel action — so a committing action always offers a clear alternative.

This rule is region-scoped and policy-driven: the requirement applies per container (such as one ButtonGroup) and is satisfied as soon as a matching companion is present in the same region. Only statically-resolved props are considered, so a dynamic variant is never treated as the missing companion.