# @json-render/codegen

Utilities for generating code from UI trees.

## Tree Traversal

### traverseSpec

Walk the UI spec depth-first.

```typescript
function traverseSpec(
  spec: Spec,
  visitor: TreeVisitor,
  startKey?: string
): void

interface TreeVisitor {
  (element: UIElement, key: string, depth: number, parent: UIElement | null): void;
}
```

### collectUsedComponents

Get all unique component types used in a spec.

```typescript
function collectUsedComponents(spec: Spec): Set<string>

// Example
const components = collectUsedComponents(spec);
// Set { 'Card', 'Metric', 'Chart' }
```

### collectStatePaths

Get all state paths referenced in props (statePath, bindPath, etc.).

```typescript
function collectStatePaths(spec: Spec): Set<string>

// Example
const paths = collectStatePaths(spec);
// Set { 'analytics/revenue', 'analytics/customers' }
```

### collectActions

Get all action names used in the spec.

```typescript
function collectActions(spec: Spec): Set<string>

// Example
const actions = collectActions(spec);
// Set { 'submit_form', 'refresh_data' }
```

## Serialization

### serializePropValue

Serialize a single value to a code string.

```typescript
function serializePropValue(
  value: unknown,
  options?: SerializeOptions
): { value: string; needsBraces: boolean }

// Examples
serializePropValue("hello")
// { value: '"hello"', needsBraces: false }

serializePropValue(42)
// { value: '42', needsBraces: true }

serializePropValue({ $state: '/user/name' })
// { value: '{ $state: "/user/name" }', needsBraces: true }
```

### serializeProps

Serialize a props object to a JSX attributes string.

```typescript
function serializeProps(
  props: Record<string, unknown>,
  options?: SerializeOptions
): string

// Example
serializeProps({ title: 'Dashboard', columns: 3, disabled: true })
// 'title="Dashboard" columns={3} disabled'
```

### escapeString

Escape a string for use in code.

```typescript
function escapeString(
  str: string,
  quotes?: 'single' | 'double'
): string
```

## Types

### GeneratedFile

```typescript
interface GeneratedFile {
  /** File path relative to project root */
  path: string;
  /** File contents */
  content: string;
}
```

### CodeGenerator

```typescript
interface CodeGenerator {
  /** Generate files from a UI spec */
  generate(spec: Spec): GeneratedFile[];
}
```

### SerializeOptions

```typescript
interface SerializeOptions {
  /** Quote style for strings */
  quotes?: 'single' | 'double';
  /** Indent for objects/arrays */
  indent?: number;
}
```