{
  "context": "This criteria evaluates how well an engineer uses @babel/core's plugin lifecycle hooks (pre, post, manipulateOptions) to implement a Babel plugin that tracks transformation statistics and modifies parser configuration.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "pre() hook implementation",
      "description": "Uses the pre() lifecycle hook to initialize the statistics tracking object before AST traversal begins. The statistics object should be stored in a way accessible to the visitor methods.",
      "max_score": 25
    },
    {
      "name": "post() hook implementation",
      "description": "Uses the post() lifecycle hook to attach statistics to file.metadata.transformStats after AST traversal completes. Should properly check the trackStats option before attaching metadata.",
      "max_score": 25
    },
    {
      "name": "manipulateOptions() hook implementation",
      "description": "Uses the manipulateOptions(opts, parserOpts) lifecycle hook to modify parserOpts.plugins to include 'jsx' for enabling JSX parsing. This should be done before parsing begins.",
      "max_score": 25
    },
    {
      "name": "Visitor pattern usage",
      "description": "Implements visitor methods (FunctionDeclaration and ArrowFunctionExpression) to count occurrences during AST traversal. Properly increments counters in the statistics object initialized in pre().",
      "max_score": 20
    },
    {
      "name": "Plugin structure",
      "description": "Returns a proper plugin object from the plugin function with the correct structure containing visitor object and lifecycle hook methods (pre, post, manipulateOptions).",
      "max_score": 5
    }
  ]
}