1. Analyze the TypeScript code for errors and `any` types.
2. Identify the root cause of type issues.
3. Design a type-safe solution using advanced TypeScript features.
4. Implement the solution, replacing `any` with specific types.
5. Write comprehensive type tests to validate the solution.
6. Verify that the code compiles without errors and has full IntelliSense support.
7. Document the changes and explain the type theory behind the solution.