@loopback/docs/site/apidocs/core.serviceinterface.md

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---
lang: en
title: 'API docs: core.serviceinterface'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/core
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---

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [ServiceInterface](./core.serviceinterface.md)

## ServiceInterface type

Representing an interface for services. In TypeScript, the `interface` does not have reflections at runtime. We use a string, a symbol or a Function as the type for the service interface.

<b>Signature:</b>

```typescript
export declare type ServiceInterface = string | symbol | Function;
```