Add TypeScript types for utils

**Problem**
When working with store, 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 utilities and store code mentioned in the issue, then inspect how types and error messages are currently handled. Confirm the expected TypeScript coverage and descriptive error cases with the existing project conventions; done means the requested utility types are present and store errors provide more debugging context.

Written by the indexing model from the issue text.