Add TypeScript types for utils

**Feature request**
It would be great to have compression for validation.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_compression` with default `false`.

Start by locating the utils code and the configuration entry point; the payload does not name specific files or tests. Clarify whether the requested TypeScript types concern the utils or the compression option, then verify that compression defaults to false and that the documented production use case is covered.

Written by the indexing model from the issue text.