Add TypeScript types for controllers

**Feature request**
It would be great to have serialization for utils.

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

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

The issue does not name files, tests, or an entry point, and its title conflicts with the serialization request. Start by locating the controller types, utils, and configuration handling; clarify the intended serialized output and confirm what tests should establish before implementing anything.

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