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

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [LifeCycleObserverRegistry](./core.lifecycleobserverregistry.md) &gt; [notifyGroups](./core.lifecycleobserverregistry.notifygroups.md)

## LifeCycleObserverRegistry.notifyGroups() method

Emit events to the observer groups

**Signature:**

```typescript
protected notifyGroups(events: (keyof LifeCycleObserver)[], groups: LifeCycleObserverGroup[], reverse?: boolean): Promise<void>;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

events


</td><td markdown="1">

(keyof [LifeCycleObserver](./core.lifecycleobserver.md)<!-- -->)\[\]


</td><td markdown="1">

Event names


</td></tr>
<tr><td markdown="1">

groups


</td><td markdown="1">

[LifeCycleObserverGroup](./core.lifecycleobservergroup.md)<!-- -->\[\]


</td><td markdown="1">

Observer groups


</td></tr>
<tr><td markdown="1">

reverse


</td><td markdown="1">

boolean


</td><td markdown="1">

_(Optional)_


</td></tr>
</tbody></table>

**Returns:**

Promise&lt;void&gt;