---
lang: en
title: 'API docs: repository.baserepositoryclass'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/repository
permalink: /doc/en/lb4/apidocs.repository.baserepositoryclass.html
---

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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [BaseRepositoryClass](./repository.baserepositoryclass.md)

## BaseRepositoryClass interface

Signature for repository classes that can be used as the base class for `define*` functions. The constructor of a base repository class accepts the target model constructor and the datasource to use.

`define*` functions require a class implementing this interface on input.

<b>Signature:</b>

```typescript
export interface BaseRepositoryClass<M extends typeof Model, R extends Repository<PrototypeOf<M>>> 
```

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [prototype](./repository.baserepositoryclass.prototype.md) | R |  |

## Methods

|  Method | Description |
|  --- | --- |
|  [(new)(modelClass, dataSource)](./repository.baserepositoryclass._new_.md) | The constructor for the generated repository class |