Add TypeScript types for parsers

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

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

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

The issue names parsers and hooks but does not identify files, tests, or an entry point. Start by locating the parser and hook implementations and their current error-handling tests; clarify whether the completed work is TypeScript type coverage, more descriptive errors, or both before changing code.

Written by the indexing model from the issue text.