{
  "context": "This criteria evaluates how well the engineer uses the @emotion/unitless package to implement type-safe CSS property validation. The focus is on correct usage of the unitless lookup object, proper type guards with type narrowing, and effective property checking patterns.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Import unitless object",
      "description": "Correctly imports the default export from '@emotion/unitless' package (e.g., `import unitless from '@emotion/unitless'`)",
      "max_score": 10
    },
    {
      "name": "Type guard implementation",
      "description": "Implements isUnitlessProperty as a proper TypeScript type guard using `property is keyof typeof unitless` return type and checks `property in unitless` and/or `unitless[property] === 1`",
      "max_score": 25
    },
    {
      "name": "Unitless lookup usage",
      "description": "Uses the unitless object for property lookups by checking if `unitless[property] === 1` or `unitless[property] !== 1` to determine if properties are unitless",
      "max_score": 20
    },
    {
      "name": "Type narrowing application",
      "description": "Applies the type guard to enable TypeScript type narrowing, using constructs like `property as keyof typeof unitless` or leveraging the type guard's return type for type-safe access",
      "max_score": 15
    },
    {
      "name": "Property checking patterns",
      "description": "Uses `in` operator or direct property access patterns with the unitless object (e.g., `property in unitless`, `unitless[property]`, or `unitless.hasOwnProperty(property)`) to check property existence",
      "max_score": 15
    },
    {
      "name": "Conditional logic with unitless",
      "description": "Implements conditional logic that branches based on whether `unitless[property] === 1` to differentiate between unitless and unit-requiring properties in formatStyleValue",
      "max_score": 15
    }
  ]
}