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

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title: 'API docs: boot.bootstrapper._constructor_'
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[Home](./index.md) &gt; [@loopback/boot](./boot.md) &gt; [Bootstrapper](./boot.bootstrapper.md) &gt; [(constructor)](./boot.bootstrapper._constructor_.md)

## Bootstrapper.(constructor)

Constructs a new instance of the `Bootstrapper` class

<b>Signature:</b>

```typescript
constructor(app: Application & Bootable, projectRoot: string, bootOptions?: BootOptions);
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  app | [Application](./core.application.md) &amp; [Bootable](./boot.bootable.md) |  |
|  projectRoot | string |  |
|  bootOptions | [BootOptions](./boot.bootoptions.md) |  |