Cursor rule

1---
2description: Keep registry base and radix trees in sync when editing shared UI
3globs: apps/v4/registry/bases/**/*
4alwaysApply: false
5---
6 
7# Registry bases: Base UI ↔ Radix parity
8 
9`apps/v4/registry/bases/base` and `apps/v4/registry/bases/radix` are **parallel registries**. Anything that exists in both trees for the same purpose (preview blocks, mirrored examples, shared card layouts, etc.) **must stay in sync**.
10 
11## When editing
12 
13- If you change a file under **`bases/base/...`**, apply the **same behavioral and visual change** to the matching path under **`bases/radix/...`** (and the reverse).
14- Only diverge where APIs differ (e.g. import paths like `@/registry/bases/base/ui/*` vs `@/registry/bases/radix/ui/*`, or Base UI vs Radix component props).
15- Do **not** update only one side unless the user explicitly asks for a single-base change.
16 
17## Typical mirrored paths
18 
19- `blocks/preview/**` — preview cards and blocks
20- Parallel `ui/*` components when both exist for the same component
21 
22After edits, briefly confirm both trees were updated (or state why one side is intentionally unchanged).
23