Barrelsby must not export colocated test mock helpers

Problem

A shared React hook test helper lived beside real hook source at:

packages/toc/src/react/hooks/tocHookMocks.ts

Because it sat in normal source, pnpm brl treated it like runtime code and generated:

export * from './tocHookMocks';

inside the public hooks barrel.

That is garbage. Mock helpers are not package API.

Root cause

The helper was not under __tests__ and did not use a test suffix, so the existing barrel exclusions had no reason to ignore it.

Barrelsby did exactly what it was told: export every normal source file in that folder.

Fix

Move the helper under __tests__ and update the specs to import it from there:

packages/toc/src/react/hooks/__tests__/tocHookMocks.ts

Then rerun pnpm --filter @platejs/toc brl so the generated barrel drops the bogus export.

Verification

These checks passed:

pnpm --filter @platejs/toc brl
bun test packages/toc/src/react/hooks/useContentController.spec.tsx packages/toc/src/react/hooks/useContentObserver.spec.tsx packages/toc/src/react/hooks/useTocElement.spec.tsx packages/toc/src/react/hooks/useTocSideBar.spec.tsx
pnpm install
pnpm turbo build --filter=./packages/toc
pnpm turbo typecheck --filter=./packages/toc
pnpm lint:fix

Prevention

If a file exists only to help specs, keep it under __tests__ or give it a test-only suffix.

Do not colocate shared mocks beside runtime hooks unless you want barrelsby to ship your test junk to users.