---
description: File-structure conventions for design-system components
globs: app/components/**/*.{ts,tsx}
alwaysApply: false
---

# Component file structure

## Split-file pattern (default)

Anything in `app/components/controls/**` and `app/components/utility/**` uses
a **4-file split**, one folder per component:

```
app/components/controls/<Name>/
  <Name>.types.ts        // Public Props + internal ViewProps
  <Name>.view.tsx        // "use client"; pure render; exports memo(view)
  <Name>.container.tsx   // "use client"; memo; prop normalization & logic
  index.tsx              // re-exports default + public types
```

**Container** (`<Name>.container.tsx`):

- Marked `"use client"`.
- Receives `<Name>Props`; computes derived state (clamps, ids, bounds, prop
  defaults) and bound event handlers.
- Renders `<<Name>View />`. Containers do **not** translate prop casing —
  enum props are lowercase end-to-end (see `component-props.mdc`).
- Default export: `memo(<Name>Container)` with `.displayName = "<Name>"`.
- Carries the Figma docstring (`Figma: "<Path>" (<node-id>)`).

**View** (`<Name>.view.tsx`):

- Marked `"use client"`.
- Pure render of `<Name>ViewProps`. No data fetching, no derived business
  logic, no enum casing translation.
- Default export: `memo(<Name>View)` with `.displayName = "<Name>View"`.

**Types** (`<Name>.types.ts`):

- Export `<Name>Props` (consumer-facing).
- Export `<Name>ViewProps` (the shape the view consumes — typically a
  resolved superset of `<Name>Props`).
- Export any locally-defined value types (`<Name>SizeValue`, etc.) sourced
  from the matching `*_OPTIONS` array in `lib/propNormalization.ts`.

**Index** (`index.tsx`):

```typescript
export { default } from "./<Name>.container";
export type { <Name>Props } from "./<Name>.types";
```

## Small presentational packages (buttons)

`app/components/buttons/<Name>/` holds **`index.tsx`** plus **`<Name>.tsx`**
(the **`Button`**, **`InlineTextButton`** packages today). Promote to the full
container/view/types split when state or logic outgrows a single module (like **`controls/TextInput`**).

## `cards/` packages

Prefer the **container / view / types** layout for **`Selection/`**, **`CardStack/`**, **`Rule/`**,
**`Icon/`**, **`Mini/`**, **`TemplateReviewCard/`**. **`Step/`** keeps a single
**`<Name>.tsx`** next to **`index.tsx`** until complexity justifies a split.

## `modals/` packages

Use the same **container / view / types** split where those files exist (**`Alert`**, **`Create`**, **`Dialog`**, **`Login`**, **`Tooltip`**, **`ModalHeader`**, **`ModalFooter`**).

## `navigation/` packages

Use the **container / view / types** split + per-package **`index.tsx`** for **`Top/`**, **`CreateFlowTopNav/`**, **`CreateFlowFooter/`**, **`NavigationItem/`**, **`Link/`**, **`MenuItem/`**. **`TopWithPathname.tsx`** lives inside **`Top/`** as the pathname + session wrapper.

**Root-level** **`Menu.tsx`**, **`Footer.tsx`**, **`ConditionalNavigation.tsx`**, and **`ConditionalNavigationClient.tsx`** sit beside those folders—no bucket-level barrel. Figma **Navigation / Menu** maps to **`Menu`** + **`MenuItem`** (see **`docs/figma-component-registry.md`**, Navigation conventions) and **`routes.mdc`** for shell behavior.

## `progress/` packages

Use the **container / view / types** split + **`index.tsx`** for **`Stepper/`** and **`ProportionBar/`** (same shape as **`controls/`**). See **`docs/figma-component-registry.md`** — **Progress conventions** for Figma **Progress** vs **Control / Proportion**.

## `sections/` packages

Section-level compositions are **mixed**: many folders use **`container` / `view` / `types`** (**`FeatureGrid/`**, **`QuoteBlock/`**, …), while **`ContentBanner.tsx`** and **`SectionNumber.tsx`** are **single modules** at the bucket root. Prefer the **split** for **new** composites; see **`docs/figma-component-registry.md`** — **Sections conventions**. **`SectionHeader/`** lives under **`type/`** (Figma Type / SectionHeader). Published rule typography body **`CommunityRule/`** lives under **`type/`** (see **Type conventions**).

## `type/` packages

**`type/`** is mostly **`container` / `view` / `types`** + **`index.tsx`** (**`HeaderLockup/`**, **`ContentLockup/`**, **`NumberedList/`**, **`InputLabel/`**). **`SectionHeader/`** is a small presentational package (**`SectionHeader.tsx`** + **`index.tsx`**) for the Figma Type SectionHeader lockup. **`CommunityRule/`**, **`Section/`**, and **`TextBlock/`** are **view + types** packages (Community Rule document tree). See **`docs/figma-component-registry.md`** — **Type conventions**.

## No package-level barrels

Do **not** add **`app/components/<bucket>/index.tsx`** that re-exports every
sibling under that bucket (there is no `buttons/index.tsx` or `asset/index.tsx`).
Import **`…/buttons/Button`**, **`…/asset/icon`**, **`…/asset/Logo`**, etc.—same
mental model everywhere.

**Per-component** **`index.tsx`** entrypoints (**`Logo/index.tsx`**, **`controls/TextInput/index.tsx`**, …) stay as documented above—aggregating an entire **`buttons/`** or **`asset/`** tier in one file does not.

## Wrapper / group components

Related composites live in a **sibling folder**, not inside the base
component's folder — mirror `CheckboxGroup/` ↔ `Checkbox/`,
`IncrementerBlock/` ↔ `Incrementer/`, etc. Each gets its own 4-file split.
Consumers import from the folder's `index.tsx`.
