biome.jsonc

{
  "$schema": "./node_modules/@biomejs/biome/configuration_schema.json",
  "extends": ["ultracite/core", "ultracite/next"],
  "overrides": [
    {
      // Vitest 4 requires `function` (not arrow) for constructor mocks called with `new`
      "includes": ["src/__tests__/**"],
      "linter": {
        "rules": {
          "complexity": {
            "useArrowFunction": "off"
          }
        }
      }
    }
  ],
  "linter": {
    "rules": {
      "style": {
        // PascalCase is standard for React components
        "useFilenamingConvention": "off"
      },
      "complexity": {
        // Allow higher complexity for complex map component setup logic
        "noExcessiveCognitiveComplexity": {
          "level": "warn",
          "options": {
            "maxAllowedComplexity": 65
          }
        },
        // forEach is acceptable in test setup
        "noForEach": "warn",
        // Banned types are needed for mock setup
        "noBannedTypes": "off"
      },
      "performance": {
        // Barrel files are standard for library exports
        "noBarrelFile": "off"
      },
      "suspicious": {
        // Array index keys are acceptable when items are not reordered
        "noArrayIndexKey": "warn",
        // Iterator callback return is acceptable in test setup
        "useIterableCallbackReturn": "warn"
      }
    }
  }
}