# BooleanPartNode

Represents a dynamic boolean attribute (e.g. `?disabled="${isDisabled}"`).

## Signatures

```ts
export declare class BooleanPartNode {
    readonly _tag: "boolean-part";
    readonly name: string;
    readonly index: number;
    constructor(name: string, index: number);
}
```

## Why

Truth values add or remove the native attribute rather than stringify it.

## Ownership and lifetime

The part owns no Attr; its render Scope owns the retained updater.

## Constructor

Creates dynamic boolean-attribute syntax.

## Property: _tag

Dynamic-boolean discriminant.

## Property: _tag: Why

Selects native attribute presence toggling.

## Property: _tag: Ownership and lifetime

Immutable AST metadata.

## Property: index

Interpolation index controlling presence.

## Property: index: Why

Locates the boolean producer without tree traversal.

## Property: index: Ownership and lifetime

Immutable scalar metadata; the render Scope owns the producer.

## Property: name

Native boolean attribute name.

## Property: name: Why

Identifies the exact attribute updated by the part.

## Property: name: Ownership and lifetime

Retained string metadata.

## Examples

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

const part = new BooleanPartNode("disabled", 0)
```