@loopback/docs/site/apidocs/boot.datasourcebooter._constructor_.md

Documentation for LoopBack 4

---
lang: en
title: 'API docs: boot.datasourcebooter._constructor_'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/boot
permalink: /doc/en/lb4/apidocs.boot.datasourcebooter._constructor_.html
---

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[Home](./index.md) &gt; [@loopback/boot](./boot.md) &gt; [DataSourceBooter](./boot.datasourcebooter.md) &gt; [(constructor)](./boot.datasourcebooter._constructor_.md)

## DataSourceBooter.(constructor)

Constructs a new instance of the `DataSourceBooter` class

<b>Signature:</b>

```typescript
constructor(app: ApplicationWithRepositories, projectRoot: string, datasourceConfig?: ArtifactOptions);
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  app | <code>ApplicationWithRepositories</code> |  |
|  projectRoot | <code>string</code> |  |
|  datasourceConfig | <code>ArtifactOptions</code> |  |