@loopback/docs/site/apidocs/core.extensions.md

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---
lang: en
title: 'API docs: core.extensions'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/core
permalink: /doc/en/lb4/apidocs.core.extensions.html
---

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [extensions](./core.extensions.md)

## extensions namespace

<b>Signature:</b>

```typescript
export declare namespace extensions 
```

## Functions

|  Function | Description |
|  --- | --- |
|  [list(extensionPointName, metadata)](./core.extensions.list.md) | Inject an array of resolved extension instances for the extension point. The list is a snapshot of registered extensions when the injection is fulfilled. Extensions added or removed afterward won't impact the list. |
|  [view(extensionPointName, metadata)](./core.extensions.view.md) | Inject a <code>ContextView</code> for extensions of the extension point. The view can then be listened on events such as <code>bind</code>, <code>unbind</code>, or <code>refresh</code> to react on changes of extensions. |