Add TypeScript types for middleware

**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.

Start by locating the middleware components and their existing error-handling code. Review how current errors are produced and where TypeScript types are defined. Done should include middleware types and more descriptive component error messages, but the issue does not identify specific files or tests.

Written by the indexing model from the issue text.