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lang: en
title: 'API docs: graphql.graphqlbindings.pub_sub_engine'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/extensions/graphql
permalink: /doc/en/lb4/apidocs.graphql.graphqlbindings.pub_sub_engine.html
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[Home](./index.md) > [@loopback/graphql](./graphql.md) > [GraphQLBindings](./graphql.graphqlbindings.md) > [PUB\_SUB\_ENGINE](./graphql.graphqlbindings.pub_sub_engine.md)
## GraphQLBindings.PUB\_SUB\_ENGINE variable
Binding key for the GraphQL pub/sub engine
<b>Signature:</b>
```typescript
PUB_SUB_ENGINE: BindingKey<PubSubEngine>
```