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

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[Home](./index.md) &gt; [@loopback/boot](./boot.md) &gt; [createComponentApplicationBooterBinding](./boot.createcomponentapplicationbooterbinding.md)

## createComponentApplicationBooterBinding() function

Create a binding to register a booter that boots the component application. Bindings that exist in the component application before `boot` are skipped. Locked bindings in the main application will not be overridden.

<b>Signature:</b>

```typescript
export declare function createComponentApplicationBooterBinding(componentApp: Application & Bootable, filter?: BindingFilter): Binding<Booter>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  componentApp | [Application](./core.application.md) &amp; [Bootable](./boot.bootable.md) | The application exposing a component |
|  filter | [BindingFilter](./context.bindingfilter.md) | <i>(Optional)</i> Binding filter to selected bindings to be added |

<b>Returns:</b>

[Binding](./context.binding.md)<!-- -->&lt;[Booter](./boot.booter.md)<!-- -->&gt;