Add TypeScript types for utils

**Problem**
When working with components, 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 utils and components but no files, entry points, or tests. First clarify whether the goal is adding TypeScript types or improving component error messages, then locate the relevant utils code and existing tests. Done should mean the agreed scope is implemented and its behavior is covered by the appropriate checks.

Written by the indexing model from the issue text.