---
lang: en
title: 'API docs: openapi-v3.ts_type_key'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.openapi-v3.ts_type_key.html
---

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[Home](./index.md) &gt; [@loopback/openapi-v3](./openapi-v3.md) &gt; [TS\_TYPE\_KEY](./openapi-v3.ts_type_key.md)

## TS\_TYPE\_KEY variable

<b>Signature:</b>

```typescript
TS_TYPE_KEY = "x-ts-type"
```

