snowplow/snowplow-javascript-tracker

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[Home](./index.md) &gt; [@snowplow/node-tracker](./node-tracker.md) &gt; [CorePlugin](./node-tracker.coreplugin.md)

## CorePlugin interface

Interface which defines Core Plugins

<b>Signature:</b>

```typescript
interface CorePlugin 
```

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [activateCorePlugin?](./node-tracker.coreplugin.activatecoreplugin.md) | (core: TrackerCore) =&gt; void | <i>(Optional)</i> Called when the plugin is initialised during the trackerCore construction |
|  [afterTrack?](./node-tracker.coreplugin.aftertrack.md) | (payload: Payload) =&gt; void | <i>(Optional)</i> Called just after the trackerCore callback fires |
|  [beforeTrack?](./node-tracker.coreplugin.beforetrack.md) | (payloadBuilder: PayloadBuilder) =&gt; void | <i>(Optional)</i> Called just before the trackerCore callback fires |
|  [contexts?](./node-tracker.coreplugin.contexts.md) | () =&gt; SelfDescribingJson\[\] | <i>(Optional)</i> Called when constructing the context for each event Useful for adding additional context to events |
|  [logger?](./node-tracker.coreplugin.logger.md) | (logger: Logger) =&gt; void | <i>(Optional)</i> Passed a logger instance which can be used to send log information to the active logger |