Add TypeScript types for data

**Description**
Currently middleware lacks proper compression support.

**Proposed solution**
Add configurable compression with sensible defaults.

**Priority**: Low/Medium

Start by locating the middleware and the data definitions referenced by the issue, then check how middleware options are currently configured. The issue does not name files or tests, so confirm whether the intended change is TypeScript declarations, compression support, or both. Done means the requested types and configurable compression with sensible defaults are covered.

Written by the indexing model from the issue text.