---
lang: en
title: 'API docs: core.extensionfor'
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.extensionfor.html
---

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

## extensionFor() function

A factory function to create binding template for extensions of the given extension point

**Signature:**

```typescript
export declare function extensionFor(...extensionPointNames: string[]): BindingTemplate;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

extensionPointNames


</td><td markdown="1">

string\[\]


</td><td markdown="1">

Names of the extension point


</td></tr>
</tbody></table>

**Returns:**

[BindingTemplate](./context.bindingtemplate.md)