# ClassNamePartNode

Represents a dynamic class name part (e.g. `class="${classes}"`).

## Signatures

```ts
export declare class ClassNamePartNode {
    readonly _tag: "className-part";
    readonly index: number;
    constructor(index: number);
}
```

## Why

Class collections have dedicated normalization while preserving unrelated
classes owned by external code.

## Ownership and lifetime

The part owns only an index; the mounted part owns its local class contribution.

## Constructor

Creates dynamic class syntax.

## Property: _tag

Dynamic-class discriminant.

## Property: _tag: Why

Selects class normalization without replacing external classes.

## Property: _tag: Ownership and lifetime

Immutable AST metadata.

## Property: index

Interpolation index producing class values.

## Property: index: Why

Locates the producer for one retained class contribution.

## Property: index: Ownership and lifetime

Immutable scalar metadata; the render Scope owns the producer.

## Examples

```ts
import { ClassNamePartNode } from "@typed/template/Template"

const part = new ClassNamePartNode(0)
```