{
  "context": "This criteria evaluates how well the engineer uses Jest's transform system to create a custom TypeScript transformer that preserves source maps through the transformation pipeline. The focus is on correct usage of transformer APIs, source map generation, and integration with Jest's configuration system.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Transformer interface implementation",
      "description": "Implements the process() function with the correct signature accepting sourceText, sourcePath, and options parameters, returning a TransformedSource object",
      "max_score": 20
    },
    {
      "name": "TypeScript compilation",
      "description": "Uses TypeScript's transpileModule() or similar API to compile TypeScript source code to JavaScript, configuring the compiler with appropriate options",
      "max_score": 15
    },
    {
      "name": "Source map generation",
      "description": "Configures TypeScript compiler with sourceMap: true or similar option to generate source maps during transformation",
      "max_score": 20
    },
    {
      "name": "Source map preservation",
      "description": "Returns the source map in the TransformedSource result object, ensuring it's in the correct format (map property containing the source map string or object)",
      "max_score": 20
    },
    {
      "name": "Jest configuration",
      "description": "Creates or modifies jest.config.js/ts to use the custom transformer via the transform configuration option, mapping .ts files to the transformer module",
      "max_score": 15
    },
    {
      "name": "Cache key implementation",
      "description": "Implements getCacheKey() function to enable Jest's transformation caching, incorporating relevant factors like source content, file path, and transformer options",
      "max_score": 10
    }
  ]
}