Add TypeScript types for store

**Feature request**
It would be great to have filtering for helpers.

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

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

The issue names no files, tests, or entry points. Start by locating the store and configuration handling, then trace how helpers are selected; done means a documented enable_filtering option defaults to false and filtering works for production deployments.

Written by the indexing model from the issue text.