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Documentation for LoopBack 4
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lang: en
title: 'API docs: repository.prototypeof'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository.prototypeof.html
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[Home](./index.md) > [@loopback/repository](./repository.md) > [PrototypeOf](./repository.prototypeof.md)
## PrototypeOf type
Type helper to infer prototype from a constructor function.
Example: `PrototypeOf<typeof Entity>` is resolved to `Entity`<!-- -->.
<b>Signature:</b>
```typescript
export declare type PrototypeOf<Ctor extends Function> = Ctor extends {
prototype: infer Proto;
} ? Proto : never;
```