# extendArrayMetadata

**Kind:** Function

**Source:** [`packages/common/utils/extend-metadata.util.ts`](https://github.com/nestjs/nest/blob/master/packages/common/utils/extend-metadata.util.ts#L1)

**Part of:** [Common](subsystem-packages-common)

## Signature

```ts
function extendArrayMetadata(key: string, metadata: T, target: Function)
```

## Parameters

| Name | Type |
|---|---|
| `key` | `string` |
| `metadata` | `T` |
| `target` | `Function` |