# NodePart

Represents a dynamic insertion point within the node structure (e.g. `<div>${content}</div>`).

## Signatures

```ts
export declare class NodePart {
    readonly _tag = "node";
    readonly index: number;
    constructor(index: number);
}
```

## Why

A node part is a bounded structural range, allowing local reconciliation and
arbitrary DOM output without a wrapper element.

## Ownership and lifetime

The AST stores only the value index; the part's child Scope owns live output.

## Constructor

Creates a structural part for one interpolation index.

## Constructor: Why

Parser tooling records exact producer paths.

## Constructor: Ownership and lifetime

Stores only the index.

## Property: _tag

Node-part discriminant.

## Property: _tag: Why

Selects bounded structural rendering.

## Property: _tag: Ownership and lifetime

Immutable AST metadata.

## Property: index

The index of the value in the interpolation array.

## Property: index: Why

Selects the producer for this exact dynamic range.

## Property: index: Ownership and lifetime

Immutable index; the mounted range owns its producer Scope.

## Examples

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

const part = new NodePart(0)
```