{
  "context": "This criteria evaluates how well the engineer uses the mixin-deep package to implement recursive merging behavior, specifically testing their understanding of when and how to use mixin-deep's recursive merging strategy for deeply nested configuration objects.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Uses mixin-deep",
      "description": "The solution imports and uses the mixin-deep package (via require or import) rather than implementing custom merging logic",
      "max_score": 30
    },
    {
      "name": "Correct function call",
      "description": "Calls mixinDeep with appropriate arguments to merge defaultConfig and userConfig in the correct order (ensuring user config overrides defaults)",
      "max_score": 25
    },
    {
      "name": "Non-mutating merge",
      "description": "Uses an empty object {} as the first argument to mixinDeep to create a new merged object without mutating the original defaultConfig or userConfig objects",
      "max_score": 25
    },
    {
      "name": "Proper return value",
      "description": "Returns the result of the mixinDeep call as the merged configuration object",
      "max_score": 20
    }
  ]
}