Add TypeScript types for config

**Problem**
When working with parsers, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

Start by locating the parser and its configuration entry points, then inspect how configuration types and parser errors are currently represented. Clarify whether the completed work is adding TypeScript config types, improving parser error detail, or both, and verify the chosen behavior with the project’s existing checks.

Written by the indexing model from the issue text.