---
id: fast-foundation.injectable
title: Injectable type
hide_title: true
---
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[@microsoft/fast-foundation](./fast-foundation.md) &gt; [Injectable](./fast-foundation.injectable.md)

## Injectable type

A class that declares constructor injected dependencies through a static "inject" field array of keys.

<b>Signature:</b>

```typescript
export declare type Injectable<T = {}> = Constructable<T> & {
    inject?: Key[];
};
```