# EventEmitter

[**@demox-labs/aleo-wallet-adapter-base**](/aleo-wallet-adapter/packages/core/base/docs.md)

***

[@demox-labs/aleo-wallet-adapter-base](/aleo-wallet-adapter/packages/core/base/docs.md) / EventEmitter

## Class: EventEmitter\<EventTypes, Context>

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:5

Minimal `EventEmitter` interface that is molded against the Node.js`EventEmitter` interface.

### Extended by

* [`BaseWalletAdapter`](/aleo-wallet-adapter/packages/core/base/docs/classes/basewalletadapter.md)

### Type Parameters

#### EventTypes

`EventTypes` *extends* [`ValidEventTypes`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/valideventtypes.md) = `string` | `symbol`

#### Context

`Context` *extends* `any` = `any`

### Constructors

#### Constructor

> **new EventEmitter**<`EventTypes`, `Context`>(): `EventEmitter`<`EventTypes`, `Context`>

**Returns**

`EventEmitter`<`EventTypes`, `Context`>

### Properties

#### prefixed

> `static` **prefixed**: `string` | `boolean`

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:9

### Methods

#### addListener()

> **addListener**<`T`>(`event`, `fn`, `context?`): `this`

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:45

**Type Parameters**

**T**

`T` *extends* `string` | `symbol`

**Parameters**

**event**

`T`

**fn**

[`EventListener`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventlistener.md)<`EventTypes`, `T`>

**context?**

`Context`

**Returns**

`this`

***

#### emit()

> **emit**<`T`>(`event`, ...`args`): `boolean`

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:32

Calls each of the listeners registered for a given event.

**Type Parameters**

**T**

`T` *extends* `string` | `symbol`

**Parameters**

**event**

`T`

**args**

...`Parameters`<[`EventListener`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventlistener.md)<`EventTypes`, `T`>>

**Returns**

`boolean`

***

#### eventNames()

> **eventNames**(): [`EventNames`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventnames.md)<`EventTypes`>\[]

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:15

Return an array listing the events for which the emitter has registered\
listeners.

**Returns**

[`EventNames`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventnames.md)<`EventTypes`>\[]

***

#### listenerCount()

> **listenerCount**(`event`): `number`

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:27

Return the number of listeners listening to a given event.

**Parameters**

**event**

[`EventNames`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventnames.md)<`EventTypes`>

**Returns**

`number`

***

#### listeners()

> **listeners**<`T`>(`event`): [`EventListener`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventlistener.md)<`EventTypes`, `T`>\[]

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:20

Return the listeners registered for a given event.

**Type Parameters**

**T**

`T` *extends* `string` | `symbol`

**Parameters**

**event**

`T`

**Returns**

[`EventListener`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventlistener.md)<`EventTypes`, `T`>\[]

***

#### off()

> **off**<`T`>(`event`, `fn?`, `context?`, `once?`): `this`

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:69

**Type Parameters**

**T**

`T` *extends* `string` | `symbol`

**Parameters**

**event**

`T`

**fn?**

[`EventListener`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventlistener.md)<`EventTypes`, `T`>

**context?**

`Context`

**once?**

`boolean`

**Returns**

`this`

***

#### on()

> **on**<`T`>(`event`, `fn`, `context?`): `this`

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:40

Add a listener for a given event.

**Type Parameters**

**T**

`T` *extends* `string` | `symbol`

**Parameters**

**event**

`T`

**fn**

[`EventListener`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventlistener.md)<`EventTypes`, `T`>

**context?**

`Context`

**Returns**

`this`

***

#### once()

> **once**<`T`>(`event`, `fn`, `context?`): `this`

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:54

Add a one-time listener for a given event.

**Type Parameters**

**T**

`T` *extends* `string` | `symbol`

**Parameters**

**event**

`T`

**fn**

[`EventListener`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventlistener.md)<`EventTypes`, `T`>

**context?**

`Context`

**Returns**

`this`

***

#### removeAllListeners()

> **removeAllListeners**(`event?`): `this`

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:79

Remove all listeners, or those of the specified event.

**Parameters**

**event?**

[`EventNames`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventnames.md)<`EventTypes`>

**Returns**

`this`

***

#### removeListener()

> **removeListener**<`T`>(`event`, `fn?`, `context?`, `once?`): `this`

Defined in: aleo-wallet-adapter/packages/core/base/node\_modules/eventemitter3/index.d.ts:63

Remove the listeners of a given event.

**Type Parameters**

**T**

`T` *extends* `string` | `symbol`

**Parameters**

**event**

`T`

**fn?**

[`EventListener`](/aleo-wallet-adapter/packages/core/base/docs/demox-labs/namespaces/eventemitter/type-aliases/eventlistener.md)<`EventTypes`, `T`>

**context?**

`Context`

**once?**

`boolean`

**Returns**

`this`


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.leo.app/aleo-wallet-adapter/packages/core/base/docs/classes/eventemitter.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.