# EventHandlers · FT4 TypeScript client · Chromia Docs (concept)

> Groups noOp event handlers interface EventHandlers { offNoOp (listener: Listener <[string]>): void; onNoOp (listener: Listener <[string]>): void;
} Methods

Source: https://docs.chromia.com/pages/ft4-ts-client/interfaces/events.EventHandlers/

Interface

# EventHandlers

On this page

* [Methods](#methods)
* [offNoOp](#offnoop)
* [onNoOp](#onnoop)

Groups noOp event handlers

```signature
interface EventHandlers {
    offNoOp(listener: Listener<[string]>): void;
    onNoOp(listener: Listener<[string]>): void;
}
```

## Methods

### offNoOp

* ```signature
  offNoOp(listener: Listener<[string]>): void
  ```

  Removes a listener that was added for receiving NoOp-events

  #### Parameters

  + listener: [Listener](https://docs.chromia.com/pages/ft4-ts-client/types/events.Listener/)<`string`>

    listener to add

  #### Returns void

### onNoOp

* ```signature
  onNoOp(listener: Listener<[string]>): void
  ```

  Adds a listener that is invoked when a NoOp event is emitted

  #### Parameters

  + listener: [Listener](https://docs.chromia.com/pages/ft4-ts-client/types/events.Listener/)<`string`>

    listener to add

  #### Returns void

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-ts-client/interfaces/events.EventHandlers.html)Generated API reference, mirrored from the live docs