---
jsApi: true
title: "[F] $_map"

---
```ts
$_map(ctx, target): void
```

Binds the internal representation of a Protobuf map.

## Parameters

| Parameter | Type | Description |
| :------ | :------ | :------ |
| `ctx` | `DecoratorContext` |  |
| `target` | `Model` |  |

## Returns

`void`
