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

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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [RepositoryMixin](./repository.repositorymixin.md)

## RepositoryMixin() function

A mixin class for Application that creates a .repository() function to register a repository automatically. Also overrides component function to allow it to register repositories automatically.

<b>Signature:</b>

```typescript
export declare function RepositoryMixin<T extends Class<any>>(superClass: T): {
    new (...args: any[]): {
        [x: string]: any;
        repository<R extends Repository<any>>(repoClass: Class<R>, name?: string | undefined): Binding<R>;
        getRepository<R extends Repository<any>>(repo: Class<R>): Promise<R>;
        dataSource<D extends juggler.DataSource>(dataSource: D | Class<D>, name?: string | undefined): Binding<D>;
        component(component: Class<unknown>, name?: string | undefined): void;
        mountComponentRepositories(component: Class<unknown>): void;
        migrateSchema(options?: SchemaMigrationOptions): Promise<void>;
    };
} & T;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  superClass | <code>T</code> |  |

<b>Returns:</b>

`{
    new (...args: any[]): {
        [x: string]: any;
        repository<R extends Repository<any>>(repoClass: Class<R>, name?: string | undefined): Binding<R>;
        getRepository<R extends Repository<any>>(repo: Class<R>): Promise<R>;
        dataSource<D extends juggler.DataSource>(dataSource: D | Class<D>, name?: string | undefined): Binding<D>;
        component(component: Class<unknown>, name?: string | undefined): void;
        mountComponentRepositories(component: Class<unknown>): void;
        migrateSchema(options?: SchemaMigrationOptions): Promise<void>;
    };
} & T`

## Example


```ts
class MyApplication extends RepositoryMixin(Application) {}

```
Please note: the members in the mixin function are documented in a dummy class called <a href="#RepositoryMixinDoc">RepositoryMixinDoc</a>


