@loopback/docs/site/apidocs/openapi-spec-builder.builderbase._constructor_.md

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

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[Home](./index.md) &gt; [@loopback/openapi-spec-builder](./openapi-spec-builder.md) &gt; [BuilderBase](./openapi-spec-builder.builderbase.md) &gt; [(constructor)](./openapi-spec-builder.builderbase._constructor_.md)

## BuilderBase.(constructor)

Constructs a new instance of the `BuilderBase` class

<b>Signature:</b>

```typescript
constructor(initialSpec: T);
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  initialSpec | T |  |