@empathyco/x-components/docs/API-reference/api/x-components.stateselector.filter.md

Empathy X Components

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[Home](./index.md) &gt; [@empathyco/x-components](./x-components.md) &gt; [StateSelector](./x-components.stateselector.md) &gt; [filter](./x-components.stateselector.filter.md)

## StateSelector.filter property

Asserts if the event should really be emitted taking into account the new and old values and the module state.

**Signature:**

```typescript
filter?: (newValue: ReturnType, oldValue: ReturnType, state: State) => boolean;
```

## Remarks

This function exist because Vue will not stop reactivity propagation if the observed variable is an `object`<!-- -->, an `Array`<!-- -->, or the `deep` mode has been enabled.