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

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[Home](./index.md) &gt; [@loopback/rest](./rest.md) &gt; [SequenceFunction](./rest.sequencefunction.md)

## SequenceFunction type

A sequence function is a function implementing a custom sequence of actions to handle an incoming request.

**Signature:**

```typescript
export type SequenceFunction = (context: RequestContext, sequence: DefaultSequence) => ValueOrPromise<void>;
```
**References:** [RequestContext](./rest.requestcontext.md)<!-- -->, [DefaultSequence](./rest.defaultsequence.md)<!-- -->, [ValueOrPromise](./context.valueorpromise.md)